physics mid term practice

Buoyant force is greatest on a submerged

1-kg block of aluminum

If a pencil's length and diameter are both multiplied by 10, then its volume is multiplied by

1000

If an elephant grows proportionally to twice its height, its weight would be multiplied by about

8

A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. Buoyant force on the rock is A) 2 N. B) 3 N. C) 4 N. D) 5 N.

A) 2 N.

A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side are used to suspend the 1-kg block, each spring will then stretch A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of the above

A) 5 cm.

Earth satellites are typically more than 100 km high so as to be above Earth's A) atmosphere. B) gravitational field. C) both of these

A) atmosphere.

The kinetic energy of a planet is maximum when it is A) closest to the Sun. B) farthest from the Sun. C) least accelerating. D) none of the above

A) closest to the Sun.

While an airplane flies at 40 m/s at an altitude of 500 meters, the pilot drops a heavy package that falls to the ground. Neglecting air drag, about where does the package land relative to the plane flying above? A) directly beneath the plane B) 400 m behind the plane C) 500 m behind the plane D) more than 500 m behind the plane E) none of the above

A) directly beneath the plane

An Earth satellite is simply a projectile A) freely falling around Earth. B) floating motionless in space near Earth. C) approaching Earth from outer space.

A) freely falling around Earth.

A heavy iron ball is placed in an aluminum pie pan that floats in a bucket. The water level at the side of the bucket is marked. Then the ball is removed and allowed to sink in the bucket. The water line at the side of the bucket A) goes down. B) is the same. C) rises.

A) goes down.

Lobsters live on the bottom of the ocean, which means their density is A) greater than the density of sea water. B) equal to the density of sea water. C) less than the density of sea water.

A) greater than the density of sea water.

The direction of a gravitational field is A) in the same direction as gravitational attraction. B) away from the center of gravity of an object. C) opposite to the direction of gravitational attraction.

A) in the same direction as gravitational attraction.

A block of Styrofoam floats on water while a lead block of the same size block lies submerged in the water. The buoyant force is greatest on the A) lead. B) Styrofoam. C) same for both

A) lead.

Pumice is a volcanic rock that floats, which means its density is A) less than the density of water. B) equal to the density of water. C) more than the density of water. D) need more information.

A) less than the density of water.

When you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be A) less. B) no different. C) more.

A) less.

Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance equal to the ball's initial speed A) multiplied by its time in the air. B) coupled with its speed of fall. C) squared plus its downward speed squared when hitting the floor. D) all of the above E) none of the above

A) multiplied by its time in the air.

An Earth satellite in an elliptical orbit travels fastest when it is A) nearest Earth. B) farthest from Earth. C) everywhere along its orbit.

A) nearest Earth

If you bake cupcakes as directed for a cake, the cupcakes will be A) over-baked. B) under-baked. C) properly baked.

A) over-baked.

The buoyant force on an object is least when the object is A) partly submerged. B) submerged near the surface. C) submerged near the bottom. D) none of the above

A) partly submerged.

When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes A) tension. B) compression. C) either of these D) none of these

A) tension.

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? A) the one dropped B) the one fired C) both hit at the same time.

A) the one dropped

The speeds of the planets about the Sun depend on A) their distances from the Sun. B) the masses of the planets. C) their periods of rotation. D) none of the above

A) their distances from the Sun.

Planets would crash into the Sun if it weren't for A) their tangential velocities. B) their vast distances from the Sun. C) the inverse-square law. D) their relatively small masses. E) the fact that they are beyond the main gravitation of the Sun.

A) their tangential velocities.

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force on the spacecraft is directed A) toward the asteroid. B) away from the asteroid. C) toward the Sun.

A) toward the asteroid.

A completely submerged object always displaces its own A) volume of fluid. B) weight of fluid. C) density of fluid. D) all of the above E) none of the above

A) volume of fluid.

Which will remain the same for two identical books, one lying flat and the other standing on an end? A) weight B) pressure C) both of these D) neither of these

A) weight

Buoyant force is greatest on a submerged 10 N block of

Aluminum

The buoyant force acting on a 10-ton ship floating in the ocean is A) less than 10 tons. B) 10 tons. C) more than 10 tons. D) depends on density of sea water

B) 10 tons.

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above Earth's surface. How much is her weight there? A) 0 B) 100 N C) 200 N D) 400 N E) none of the above

B) 100 N

A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume? ( density/ mass ) A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of the above

B) 3 cubic meters

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be A) zero. B) 40 N. C) 120 N. D) 360 N. E) 1080 N.

B) 40 N.

An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length A) 60 cm. B) 70 cm. C) 80 cm. D) 100 cm. E) 120 cm.

B) 70 cm.

Which has more skin compared to its body weight? A) an elephant B) a mouse C) both the same

B) a mouse

Which ball is more elastic? A) a common rubber ball B) a steel ball C) both the same

B) a steel ball

Which ball will bounce higher off a hard surface? A) a common rubber ball B) a steel ball C) both the same

B) a steel ball

Buoyant force is greater on a submerged 10-newton block of A) lead. B) aluminum. C) same on each

B) aluminum.

Earth's gravitational field extends A) only above and beyond Earth's surface and cancels inside Earth. B) both inside and outside Earth and throughout the entire universe. C) neither of these

B) both inside and outside Earth and throughout the entire universe.

When an object is partly or wholly immersed in a liquid, it is buoyed up A) by a force equal to its own weight. B) by a force equal to the weight of liquid displaced. C) and floats in accord with Archimedes' principle. D) all of the above E) none of the above

B) by a force equal to the weight of liquid displaced.

When weight is applied to the top of a stone arch, the stone blocks in the arch undergo A) tension. B) compression. C) expansion. D) none of the above

B) compression.

If a loaf of bread is compressed its A) density decreases. B) density increases. C) neither of these

B) density increases.

If the mass of an object were doubled while its volume remained the same, its density would A) be half. B) double. C) stay the same. D) be four times as great.

B) double.

A ball is tossed upward. Neglecting air drag, the acceleration along its path is A) 0 g. B) g downward. C) g upward. D) g upward, then g downward. E) none of the above

B) g downward

If you hold two objects that have the same weight density, then they A) may have unequal mass densities. B) have equal mass densities. C) are equal in weight.

B) have equal mass densities.

As soon as a ball rolls off the edge of a table A) it is not acted on by any forces. B) it is not acted on by any horizontal forces. C) has a zero net force acting on it. D) none of the above

B) it is not acted on by any horizontal forces.

When the potential energy of a satellite decreases A) kinetic energy also decreases. B) its kinetic energy correspondingly increases. C) its distance from the orbiting body increases. D) none of the above

B) its kinetic energy correspondingly increases.

Support a horizontal toothpick at both ends. Then do likewise for a log of the same kind of wood. There is more sag in the A) toothpick. B) log. C) same in each

B) log.

If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be A) higher. B) lower. C) no different

B) lower.

Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper because the A) gravitational field is shielded inside the building. B) mass of the building above slightly attracts us upward. C) both of these D) neither of these

B) mass of the building above slightly attracts us upward.

An astronaut at Earth's surface has a mass of 50 kg and a weight of 500 N. If she were floating freely inside a space habitat in remote space, she would have A) no weight and less mass. B) no weight and the same mass. C) more weight and no mass. D) none of the above

B) no weight and the same mass.

A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is A) still zero. B) non-zero, directed toward the spaceship. C) non-zero, directed away from the spaceship.

B) non-zero, directed toward the spaceship.

The main reason ocean tides exist is that Moon's pull is stronger A) than the pull of the Sun. B) on water closer to it than on water farther away. C) on Earth's oceans than on Earth itself. D) all of the above

B) on water closer to it than on water farther away.

If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about A) ten and its weight by ten also. B) one hundred, and its weight by one thousand. C) one thousand, and its weight by one hundred thousand. D) none of the above

B) one hundred, and its weight by one thousand.

If you float a piece of wood in a container brim-full of water that rests on a weighing scale, some water will spill. Then the weight reading on the scale will A) decrease. B) remain unchanged. C) increase.

B) remain unchanged.

2) As soon as a bowling ball rolls off the edge of a table its horizontal component of velocity A) decreases. B) remains constant. C) increases.

B) remains constant.

Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When the two life preservers are worn by swimmers, one swimmer floats with part of the preserver above water, and the other swimmer sinks. In this case the buoyant force is greater on the life preserver filled with A) Styrofoam. B) sand. C) same for both

B) sand.

If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will A) come to an abrupt stop at Earth's center. B) speed up until it gets to Earth's center. C) speed up until it reaches Earth's other side. D) slow down until it reaches Earth's center.

B) speed up until it gets to Earth's center.

When a load is placed on a properly arched structure, compression A) weakens the structure. B) strengthens the structure. C) neither of these

B) strengthens the structure.

Compared to a bar of pure gold, the density of a pure gold ring is A) less. B) the same. C) slightly more. D) much more.

B) the same.

Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time? A) the horizontal component B) the vertical component C) both of these D) neither of these

B) the vertical component

When a chocolate bar is cut in half, its density is A) halved. B) unchanged. C) doubled.

B) unchanged.

Escape speed from the Sun is A) about the same as from Earth. B) very much greater than for Earth. C) indefinite.

B) very much greater than for Earth.

Inside a freely-falling elevator, you would have no A) gravitational force on you. B) weight. C) both of these D) neither of these

B) weight.

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later? A) 50 m B) 98 m C) 100 m D) 490 m E) none of the above

C) 100 m

Escape speed from Earth is A) 8 km/s. B) 9 km/s. C) 11.2 km/s. D) 63 km/s.

C) 11.2 km/s.

A weightless spring is stretched 10 cm by a suspended 1-kg block. If two such springs are used to suspend the block, one spring above the other, to effectively provide one double-length spring, then the total stretch of the double-length spring will be A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of the above

C) 20 cm.

The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much because A) your mass is 100 times less on Jupiter. B) Jupiter is significantly farther from the Sun. C) Jupiter's radius is about 10 times Earth's radius. D) you are 100 times more weightless there. E) none of the above

C) Jupiter's radius is about 10 times Earth's radius.

An Earth satellite in close orbit circles Earth in about an hour and a half. How long would a satellite located as far away as the Moon take to orbit Earth? A) the same hour and a half B) less than an hour and a half C) about 28 days D) need more information E) none of the above

C) about 28 days

We do not observe tides in a community swimming pool because A) gravitation on the small mass of water is negligibly small. B) it is shallow compared to the ocean. C) all parts of it are practically the same distance from the Moon. D) they are masked by the much stronger pull of Earth gravity. E) the tides are only observed at night.

C) all parts of it are practically the same distance from the Moon.

Rate this statement: No force due to Earth's gravity acts on astronauts inside the orbiting space station. A) always true while in orbit B) sometimes true while in orbit C) always false

C) always false

A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the A) rolling ball. B) dropped ball. C) both hit at the same time

C) both hit at the same time

An egg rests at the bottom of a bowl filled with water. When salt is slowly added to the water the egg rises and floats, from which we conclude A) salt water is denser than fresh water. B) salt water is denser than an egg. C) both of these D) neither of these

C) both of these

Angular momentum is conserved for a satellite in A) circular orbit. B) elliptical orbit. C) both of these D) neither of these

C) both of these

The pressure in a liquid depends on liquid A) density. B) depth. C) both of these D) neither of these

C) both of these

When air drag affects the motion of projectiles, they don't travel A) as high. B) as far. C) both of these D) neither of these

C) both of these

Which has the greater density? A) a cup-full of fresh water B) a lake-full of fresh water C) both the same D) need more information

C) both the same

The Gateway Arch in St. Louis, Missouri, is a A) parabola. B) hyberbola. C) catenary.

C) catenary.

According to Kepler, the orbital period of a planet is directly proportional to the A) planet's average distance from the Sun. B) square of the planet's average distance from the Sun. C) cube of the planet's average distance from the Sun.

C) cube of the planet's average distance from the Sun.

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity A) increases. B) remains unchanged. C) decreases.

C) decreases.

While standing, your blood pressure is normally greatest in your A) head. B) heart. C) feet. D) same in each

C) feet.

The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then A) twice. B) three times greater. C) four times greater. D) none of the above

C) four times greater.

According to Kepler, the line from the Sun to any planet sweeps out equal areas of space A) with each complete revolution. B) only when the paths are ellipses. C) in equal time intervals.

C) in equal time intervals.

If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will A) decrease. B) remain unchanged. C) increase.

C) increase.

Suppose you put a chocolate layer on pieces of candy. Compared with the amount of chocolate used to cover 1 pound of large pieces, if you cover 1 pound of smaller pieces you'll use A) less chocolate. B) the same amount of chocolate. C) more chocolate. D) makes no difference

C) more chocolate.

Buoyant force acts upward on a submerged object because A) it acts in a direction to oppose gravity. B) the weight of fluid displaced reacts with an upward force. C) pressure against its bottom is greater than pressure against its top. D) none of the above

C) pressure against its bottom is greater than pressure against its top.

When an ice cube in a glass of water melts, the water level A) rises. B) falls. C) remains the same.

C) remains the same.

Buoyant force is greater on a submerged 1-cubic centimeter block of A) lead. B) aluminum. C) same on each

C) same on each

Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with A) Styrofoam. B) sand. C) same on each as long as their volumes are the same

C) same on each as long as their volumes are the same

There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which is the more likely scenario? A) the huge size of the Atlantic Ocean makes this impossible B) although the force on his finger would have been huge, the pressure would have been small enough for this to occur C) the force on his finger would have been less than 1 N D) both force and pressure on his finger would have been great, but not too great for a public-spirited Dutch lad E) none of the above

C) the force on his finger would have been less than 1 N

A black hole is A) an empty region of space with a huge gravitational field. B) at the center if all stars. C) the remains of a giant star that has undergone gravitational collapse.

C) the remains of a giant star that has undergone gravitational collapse.

If the Sun collapsed to a black hole, Earth's gravitational attraction to it would be A) more. B) less. C) the same

C) the same

You wish to drill a hole through a horizontal I-beam supporting a bridge. To weaken the beam the least drill the hole through the A) upper flange. B) lower flange. C) web. D) all the same

C) web.

Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in an orbiting space vehicle do not, because passengers in the space vehicle are A) beyond the main pull of Earth's gravity. B) above Earth's atmosphere. C) without support forces. D) all of the above E) none of the above

C) without support forces.

A projectile is launched from ground level at 15° above the horizontal and lands downrange. What other projection angle for the same speed would produce the same down-range distance? A) 30° B) 45° C) 50° D) 75° E) 90°

D) 75°

If an elephant grows proportionally to twice its height, its weight would be multiplied by about A) 2. B) 4. C) 6. D) 8. E) none of the above

D) 8.

The circular path of a satellite orbiting Earth is characterized by a constant A) speed. B) acceleration. C) radial distance. D) all of the above E) none of the above

D) all of the above

Which of these vary for satellites in elliptical orbits? A) speed. B) momentum. C) kinetic energy. D) all of the above E) none of the above

D) all of the above

According to Kepler, the paths of planets about the Sun are A) parabolas. B) circles. C) straight lines. D) ellipses. E) none of the above

D) ellipses.

How far must one travel to escape Earth's gravitational field? A) to a region above Earth's atmosphere B) to a region well beyond the Moon C) to a region beyond the solar system D) forget it; you can't travel far enough.

D) forget it; you can't travel far enough.

The pressure at the bottom of a jug filled with water does NOT depend on A) the acceleration due to gravity. B) water density. C) the height of the liquid. D) surface area of the water. E) none of the above

D) surface area of the water.

The factor most directly responsible for making a black hole invisible is its A) size. B) mass. C) color. D) surface escape velocity. E) none of the above

D) surface escape velocity.

The density of a submerged submarine at rest is about the same as the density of A) a crab. B) iron. C) a floating submarine. D) water. E) none of the above

D) water.

Two planets in space gravitationally attract each other. If both the masses and distances are doubled, the force between them is A) one-quarter. B) half as much. C) twice as much. D) four times as much. E) none of the above

E) none of the above

Which of these vary for satellites in circular orbits? A) speed. B) momentum. C) kinetic energy. D) all of the above E) none of the above

E) none of the above

A floating ice cube contains small pieces of iron. The water level after melting will

Fall

An apple weighs 1 N. When held at rest above your head, the net force on the apple is (F=ma) a) 0 N b) 0.1 N c) 1 N d) 9.8 N e) none of the above

a) 0 N

Two identical objects in outer space, one moving at 2 m/s, the other at 1 m/s, have a head-on collision and stick together. Their combined speed after the collision is a) 0.5 m/s b) 0.33 m/s c) 0.67 m/s d) 1.0 m/s e) none of the above

a) 0.5 m/s

A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is a) 10% b) 50% c) 90% d) 110%

a) 10%

A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank a) 100 m farther south b) due east of its starting point c) 141 m farther south d) none of the above

a) 100 m farther south

The speed of a 4-kg ball with a momentum of 12 kg m/s is (p=mv) a) 3 m/s b) 4 m/s c) 12 m/s d) 48 m/s e) none of the above

a) 3 m/s

The work done in pushing a TV set a distance of 2 m with an average force of 20 N is a) 40 j b) 10 j c) 20 j d) 800 j e) 2 j

a) 40 j

Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter a) lengthened time of contact b) shorter time of contact c) decreased impulse d) increased momentum

a) Lengthened time of contact

A machine that promises more energy output than input is a) a fantasy b) commonplace in todays technology c) a long-shot worth investing in

a) a fantasy

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in a) a straight line path b) on outward spiral path c) a curved path d) an inward spiral path

a) a straight line path

A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of a) about 14 km/h b) 20 km/h c) more than 20 km/h d) 10 km/h

a) about 14 km/h

If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object a) accelerates in the direction of the applied force b) accelerates opposite the direction of the applied force c) experiences greater friction d) none of the above

a) accelerates in the direction of the applied force

The universal gravitational constant G was first measured a) after newtons time b) by newton himself c) before newtons time

a) after newtons time

Art museum use weaker wires than those used in homes because paintings in museums a) are suspended by pairs of vertical wires b) are more firmly attached c) are usually lighter in weight

a) are suspended by pairs of vertical wires

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the a) arrows push against the bowstring b) combined weight of the arrow and bowstring c) friction of the ground against the archers feet d) grip of the archers hand on the bow

a) arrows push against the bowstring

If you toss a coin straight upward while in a train moving at constant velocity, the coin will land a) as if you were at rest b) in front of you c) in back of you

a) as if you were at rest

Stand a broom upright on the end of its pole and let it topple to the floor. Repeat, but with the bristles end on the floor. The faster fall will be the broom standing on its a) bristles end b) the same either way c) pole end

a) bristles end

To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should a) buy at a high altitude and sell at a low altitude. b) buy at a low altitude and sell at a high altitude. c) it makes no difference.

a) buy at a high altitude and sell at a low altitude.

When a train makes a curve, a tapered wheel rim is able to a) cover different distances per revolution b) maintain a fixed rotational speed c) reduce differences in angular speeds

a) cover different distances per revolution

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard a) decreases b) increased c) neither increases or decreases

a) decreases

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always a) directed downward b) directed upward c) in the direction of motion d) opposite its velocity e) none of the above

a) directed downward

Impulse involves the time that a force acts, whereas work involves the a) distance that force acts b) time and distance that a force acts c) acceleration that a force produces

a) distance that a force acts

Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed a) doubles b) halves c) remains the same

a) doubles

Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed a) doubles b) remains the same c) halves

a) doubles

A tightrope walker more easily balances on a tight wire if her pole a) droops b) is short but heavy c) is held high

a) droops

The unit kilowatt-hour is a unit of a) energy b) momentum c) power d) time

a) energy

The force with which Earth pulls on the Moon is a) equal in magnitude to the force that the moon pulls on the earth b) the only force acting between earth and moon c) somewhat greater than the moons pull on earth

a) equal in magnitude to the force that the moon pulls on the earth

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is a) greater b) smaller c) the same

a) greater

A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a 2-meter-long ramp to the same elevation. With the ramp, the applied force required is about a) half as much b) the same c) twice as much d) four times as much

a) half as much

A heavy rock and a light rock of the same size are falling through the air from a tall building. the one that encounters the greatest air resistance is the a) heavy rock b) light rock c) both the same

a) heavy rock

If Earth rotated more slowly about its axis, your weight would a) increase b) decrease c) stay the same d) be zero

a) increase

When a twirling ice skater brings her arms inward, her rotational speed a) increases b) decreases c) remains the same

a) increases

A satellite coasting at constant speed in a circular orbit a) is nevertheless accelerating b) undergoes changes in its potential energy c) is beyond the pull of the earths gravity d) none of the above

a) is nevertheless accelerating

A primary difference between momentum and kinetic energy is a) momenta can cancel; kinetic energy cannot b) kinetic energy can cancel; momenta cannot c) either of the above depending on circumstances d) none of the above

a) momenta can cancel; kinetic energy cannot

A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater a) momentum b) acceleration c) speed d) all of the above e) none of the above

a) momentum

If the speed of a motor scooter doubles, which of the following also doubles? a) momentum b) kinetic energy c) acceleration d) all of the above

a) momentum

A golf ball is thrown at and bounces backward from a massive bowling ball that in initially at rest. After the collision, compared to the golf ball, the bowling ball has more a) momentum, but less kinetic energy b) kinetic energy, but less momentum c) momentum and more kinetic energy d) need more information

a) momentum, but less kinetic energy

An object that has kinetic energy must be a) moving b) falling c) at an elevated position d) at rest e) none of these

a) moving

An industrial flywheel has a greater rotational inertia when most of its mass is a) nearer the rim b) nearer the axis c) uniformly spread out as in a disk

a) nearer the rim

The conservation of momentum is most closely related to a) newtons 3rd law b) newtons 2nd law c) newtons 1st law d) newtons law of gravity

a) newtons 3rd law

A gymnast performing somersaults in a high flying plane moving at constant velocity needs to make a) no adjustments b) small adjustments to compensate for the airplanes velocity c) major adjustments to compensate for the airplanes velocity d) none of the above

a) no adjustments

Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity a) remains constant b) decreases with time c) increases with time

a) remains constant

Monkey Mo hangs from the middle of a horizontal rope. Tension in the rope is greatest if the rope a) sags very little b) sags or doesnt sag, for tension is the same in any case c) sags alot d) none of the above

a) sags very little

Galileo's use of inclined planes allowed him to effectively a) slow down the balls changes in speed b) eliminate friction c) eliminate all changes in speed d) reduce the time of the balls changes in speed

a) slow down the balls changes in speed

Which requires the most amount of work by the brakes of a car? a) slowing down from 100 km/hr to 70 km/hr b) slowing down from 70 km/hr to a stop c) equal amounts for both

a) slowing down from 100 km/hr to 70 km/hr

Hydro and wind power are indirect forms of a) solar energy b) fossil fuels deep down c) nuclear energy in earths interior d) none of the above

a) solar energy

Which of the following is not a vector quantity? a) speed b) velocity c) acceleration d) all are vector quantities e) none are vector quantities

a) speed

While an iron block near the Earth's surface is in free fall, it undergoes an increase in a) speed b) acceleration c) both of these d) neither of these

a) speed

The rotational inertia of your leg is greater when your leg is a) straight b) bent c) same either way

a) straight

newton discovered a) that gravity is universal b) gravity c) neither of these

a) that gravity is universal

When a cannonball is fired from a cannon, which undergoes the greater acceleration? a) the cannonball b) the recoiling cannon c) both the same

a) the cannonball

Which of these three produces the greatest tidal effect on you right now? a) the earth b) the sun c) the moon

a) the earth

Planets wobble in their orbits due to A) the gravitational attraction to other planets. B) uncertainties in the inverse-square law. C) elliptical-orbit quirks. D) all of the above E) none of the above

a) the gravitational attraction to other planets.

Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is a) the spring pulling on harry b) both the wall and the spring pulling on harry c) the wall pulling oppositely on the spring d) none of the above

a) the spring pulling on harry

Earth's primary energy source is a) the sun b) fossil fuel c) electricity d) geothermal

a) the sun

A ball rolling down an incline has its maximum potential energy at a) the top b) a quarter of the way down c) halfway down d) the bottom

a) the top

If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by a) two b) four c) eight

a) two

In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is a) very weak b) very strong c) strong

a) very weak

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the a) volkswagon b) mack truck c) same for both

a) volkswagon

To rotate a stubborn screw, it is best to use a screwdriver that has a a) wide handle b) long handle c) smooth handle d) none of the above

a) wide handle

The force required to maintain a constant velocity for an astronaut in free space is equal to a) zero b) the mass of the astronaut c) the weight of the astronaut d) the force required to stop the astronaut e) none of the above

a) zero

The net force acting on an insect falling downward at constant velocity is a) zero b) the weight of the insect c) upward air resistance d) none of the above

a) zero

two billard balls having the same mass and speed roll toward each other. what is their combined momentum after they meet a) zero b) half the sum of their original momentums c) twice the sum of their original momentums d) need more information

a) zero

You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg you'll momentarily accelerate from the wall at about (F=ma) a) 0.08 m/s^2 b) 0.8 m/s^2 c)8.0 m/s^2 d) none of the above

b) 0.8 m/s^2

A 1 kg chunk of putty moving at 1 m/s collides with and sticks to a 5 kg bowling ball initially at rest. The bowling ball and putty then move with the momentum of a) 0 kg m/s b) 1 kg m/s c) 2 kg m/s d) 5 kg m/s e) more than 5 kg m/s

b) 1 kg m/s

On a balanced seesaw, a boy three times as heavy as his partner sits a) less than 1/3 the distance from the fulcrum b) 1/3 the distance from the fulcrum c) more than 1/3 the distance from the fulcrum

b) 1/3 the distance from the fulcrum

About 40 J is required to push a crate 4 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about a) 4 N b) 10 N c) 40 n d) 160 N

b) 10 N

The support force on a 10-N book at rest on a table is a) slightly less than 10 N b) 10 N c) slightly greater than 10 N d) dependent on the position of the book

b) 10 N

A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of a) 10 N to the right b) 10 N to the left c) 20 N to the right d) 20 N to the left

b) 10 N to the left

If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is a) greater than 10 m/s b) 10 m/s c) less than 10 m/s

b) 10 m/s

Neglecting air resistance, Sammy Smarts on a high ladder releases a ball that strikes the ground with 100 J of Kinetic energy. If he were to instead throw the ball straight upward, it will soon reach the ground with a kinetic energy of a) less than 100 J b) 100 J c) more than 100 J

b) 100 J

Phil applies 100 N to a pulley system and raises a load one-tenth of his downward pull. Ideally, the weight of the load is a) 100 N b) 1000 N c) 10,000 N d) more than 10, 000 N

b) 1000 N

If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about a) more than 200 m b) 180 m c) 60 m d) 120 m

b) 180 m

A 2 kg box of taffy candy has 40 J of potential energy relative to the ground. Its height above the ground is ( PE= mgh ) a) 1 m b) 2 m c) 3 m d) 4 m e) none of these

b) 2 m

The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second than its linear speed is a) 1 m/s b) 2 m/s c) 3 m/s d) 3.14 m/s e) 6.28 m/s

b) 2 m/s

The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is ( vf*0*-vi *10* over time *5* to find acceleration, then F=ma ) a) 1000 N b) 2000 N c) 3000 N d) 4000 N e) 5000 N

b) 2000 N

The power required to exert 4-N force over 3 meters in 2 seconds is a) 4 W b) 6 W c) 8 W d) 12 W e) none of the above

b) 6 W

Which has greater kinetic energy? a) a car traveling at 30 km/hr b) a car of half the mass traveling at 60 km/ hr c) both the same d) need more information

b) a car of half the mass traveling at 60 km/ hr

Multiply the equation for linear momentum by radial distance r and you have a) rotational kinetic energy b) angular momentum c) rotational inertia

b) angular momentum

Acrobat Bart at the circus drops vertically onto the end of a see-saw, with his partner Art equidistant from the fulcrum at the other end. Art is propelled straight upward a distance twice that of Bart's dropping distance. Neglecting inefficiencies we see a) the masses of art and bart are equal b) art has half the mass of bart c) need more information

b) art has half the mass of bart

If Earth had a pair of identical moons on opposite sides of the same circular orbit, the center of gravity of the double-moon-Earth system would be a) outside the earth, but beyond the orbital path of the moons b) at the center of the earth c) outside the earth, but within the orbital path of the moons d) in the earth but off center

b) at the center of the earth

A vertically-held sledge hammer is easier to balance when the heavier end is a) on your hand b) at the top, away from your hand c) the same either way

b) at the top, away from your hand

The bob of a simple pendulum has its maximum kinetic energy at the a) top of its swing b) bottom of its swing c) midpoint between top and bottom d) at all points along its path of swing

b) bottom of its swing

A karate chop is more effective if one's hand a) follows through upon impact b) bounces upon impact c) extends the time upon impact

b) bounces upon impact

The greater efficiency achieved with the curved blades of a Pelton wheel is due to a) greater time of water impact b) bouncing c) divided impulse d) rotational momentum

b) bouncing

A coin and a ring roll down an incline at the same time. The one to first reach the bottom is the a) ring b) coin c) both reach the bottom at the same time

b) coin

Eratosthenes first learned about the position of the Sun in mid-summer by a) setting up sticks at both syene and alexandria b) consulting library information c) setting up sticks at alexandria d) setting up sticks at syene e) none of the above

b) consulting library information

If Earth's radius somehow increased with no change in mass, your weight would a) increase also. b) decrease. c) stay the same.

b) decrease.

The net force exerted on a car traveling in a circular path at constant speed is a) directed forward, in the direction of travel b) directed toward the center of the curve c) zero because the car is not accelerating d) none of the above

b) directed toward the center of the curve

Two 2-m/s pool balls roll toward each other and collide. Suppose after bouncing apart each moves at 4 m/s. This collision violates the conservation of a) momentum b) energy c) both momentum and energy d) none of the above

b) energy

Two identical golf carts move at different speeds. The faster cart has twice the speed and therefore has a) twice the kinetic energy b) four times the kinetic energy c) eight times the kinetic energy d) none of these

b) four times the kinetic energy

Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard. The reason he doesn't slip off the skateboard is due to a) momentum change b) friction between his feet and the board c) inertia in motion

b) friction between his feet and the board

Science and technology are a) actually one and the same b) fundamentally different from eachother c) responsible for all the good in the world d) responsible for all the bad in the world

b) fundamentally different from eachother

A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is less than 90°, their resultant is a) less b) greater c) the same

b) greater

Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The magnitude of momentum for the combined wreck is a) the same as the magnitude of momentum of either car before collision b) greater than the magnitude of momentum of either car before collison c) less than the magnitude of momentum of either car before collison d) none of the above

b) greater than the magnitude of momentum of either car before collison

According to Newton, the greater the masses of interacting objects, the a) less the gravitational force between them. b) greater the gravitational force between them. c) greater the force between them by the square of the masses.

b) greater the gravitational force between them.

Whether a truck comes to a stop by crashing into a brick wall or a hay stack, the stopping force is? a) greater with the haystack b) greater with the wall c) both the same

b) greater with the wall

Nellie's weight and normal force usually have the same magnitude when she stands on a a) inclined surface b) horizontal surface c) either a horizontal or inclined surface

b) horizontal surface

A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with the momentum of a) less than 1 unit b) more than 1 unit c) 1 unit d) not enough information

b) more than 1 unit

If a Ping-Pong ball and a golf ball both move in the same direction with the same amount of kinetic energy, the speed of the Ping-Pong ball must be a) less than the golf ball b) more than the golf ball c) both the same d) need more information

b) more than the golf ball

Horses with the greatest linear speed on a merry-go-round are located a) near the center b) near the outside c) anywhere, because they all move at the same speed

b) near the outside

Wobbles in the path of Uranus led to the discovery of a) jupiter b) neptune c) mars d) all of the above e) none of the above

b) neptune

Who envisioned the motion of planets as projectiles obeying the laws of physics? a) kepler b) newton c) both of these d) neither of these

b) newton

The concept of force is fundamental to a) einsteins theory of gravitation b) newtons theory of gravitation c) both of these d) neither of these

b) newtons theory of gravitation

Although perpetual motion is the natural order of things in the universe a) it follows that machines can operate and do work by perpetual motion b) no perpetual- motion device that multiples energy exists c) both of these are false statements

b) no perpetual- motion device that multiples energy exists

According to Newton, when the distance between two interacting objects doubles, the gravitational force is a) half. b) one-quarter. c) the same. d) twice as much. e) four times as much.

b) one-quarter.

As a huge rotating cloud of particles in space gravitate together forming an increasingly dense ball, it shrinks in size and a) rotates slower b) rotates faster c) rotates at the same speed d) can not rotate

b) rotates faster

A torque acting on an object tends to produce a) equilibrium b) rotation c) linear motion d) velocity e) a center of gravity

b) rotation

Which pulls on the oceans of Earth with a greater force? A) Moon B) Sun c) both pull the same

b) sun

The attraction between earth and sydney is equal to her weight. The reaction to earths pull on sydney is a) sydney pushing against earths surface b) sydneys pull on earth c) the support of earths surface on sydney d) none of the above

b) sydneys pull on earth

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the plank's mass. If you can stand on the end of a plank that overhangs the edge of the supporting table 1/4 its total length, how massive is the plank compared to your mass? a) 1/2 b) the same c) 1 and 1/2 times d) twice e) 4 times

b) the same

One side of the Moon continually facing Earth is a) a passing phenomenon b) tidal lock c) a cosmic coincidence

b) tidal lock

Relative to an initial height, an object raised twice as high has a gravitational potential energy a) half as much b) twice as much c) four times as much d) need more information

b) twice as much

The work you do when pushing a shopping cart twice as far while applying the same force is a) half as much b) twice as much c) four times as much d) the same amount

b) twice as much

A bird sitting on the limb of a tree is moving about 30 km/s with respect to the sun. If the bird takes 1 second to drop down to a worm below, the worm would be 30 km downrange from the bird when it reached the ground. This faulty reasoning is best countered with Newtons. a) law of gravity b)law of inertia c) law of motion d) none of the above

b)law of inertia

If a weighted air filled balloon sinks in deep water, it will

be acted on by a continuously decreasing buoyant force

If the volume of an object were doubled while its mass remained the same, its density would

be half

When you place a stick in water and remove it, the stick is wet. If you instead place it in mercury the opposite occurs. The stick is dry. This is because adhesive forces are greater

between stick and water

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about a) 2 s b) 10 s c) 1 s d) not enough information

c) 1 s

A piece of putty moving with 1 units of momentum strikes and sticks to a heavy bowling ball that is initially at rest. Both move with a combined momentum of a) less than 1 unit b) more than 1 unit c) 1 unit d) need more information

c) 1 unit

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at a) 0 m/s b) 1/2 m/s c) 1/3 m/s d) 1/6 m/s e) 1.5 m.s

c) 1/3 m/s

A 5 kg shark swimming at 1 m/s swallows an absent minded 1 kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is (netmv) initial = (net mv) final mass x velocity - mass x velocity = (mass + mass ) (v) a) 1/2 m/s b) 1/5 m/s c) 1/6 m/s d) 2/3 m/s e) 3/2 m/s

c) 1/6 m/s

A 1 kg mass at the earths surface weights ( W= mg) a) 1 N b) 5 N c) 10 N d) 12 N e) none of the above

c) 10 N

A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of a) less than 100 J b) more than 100 J c) 100 J d) need more information

c) 100 J

One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is a) 0 N b) 50 N c) 100 N d) 200 N

c) 100 N

An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north? a) 141 km/h b) 110 km/h c) 100 km/h d) 41 km/h

c) 100 km/h

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is ( p= mv ) a) 4 kg b) 12 kg c) 16 kg d) 144 kg e) none of the above

c) 16 kg

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the plank's mass. If you can stand on the end of a plank that overhangs the edge of the supporting table 1/5 its total length, how massive is the plank compared to your mass? a) 1/3 b) the same c) 2/3 d) 1 and 1/3 times e) more than 1 and 1/3 times

c) 2/3

When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance of ( s= d/t ) a) 15 m b) 10 m c) 20 m d) 2 m

c) 20 m

A 2500 N pile driver ram falls 10 m and drives a post 0.1 m into the ground. The average impact force on the ram is a) 2,500 N b) 2,500,000 N c) 250,000 N d) 25,000 N

c) 250,000 N

An astronaut of mass 70 kg weighs 700 N on Earth's surface. His weight on the surface of Mars, where the acceleration due to gravity is 3.7 m/s2, would be about ( F=ma ) a) the same as on earth b) 130 N c) 260 N d) 370 N e) none of the above

c) 260 N

A motorcycle of mass 100 kilograms slowly rolls off the edge of a cliff and falls for three seconds before reaching the bottom of a gully. Its momentum upon hitting the ground is ( v= at, then p= mv) a) 1,000 kg m/s b) 2,000 kg m/s c) 3,000 kg m/s d) 4,000 kg m/s e) 9,000 kg m/s

c) 3,000 kg m/s

A 2000 kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was ( F=ma for acceleration; then vf= vi +a x t, solve for initial velocity.) a) 1.2 m/s b) 15 m/s c) 30 m/s d) 45 m/s e) none of the above

c) 30 m/s

A 1000 kg automobile enters a freeway on - ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time? a = vf-vi over time d = 1/2at^2 1/2 (40 m/s + 20 m/s) (10 s) = a) 100 m b) 200 m c) 300 m d) 400 m e) none of the above

c) 300 m

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration? a) 2.8 m/s b) 10 m/s c) 4.0 m/s d) 0.25 m/s e) 40 m/s

c) 4.0 m/s

A 5 kg fish swimming at 1 m/s swallows an absent- minded 1 kg fish at rest. The speed of the larger fish after lunch is (netmv) initial = (net mv) final mass x velocity - mass x 0 = (mass + mass ) (v) a) 1/2 m/s b) 2/5 m/s c) 5/6 m/s d) 6/5 m/s e) 1 m/s

c) 5/6 m/s

A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is a) 10% b) 20% c) 50% d) 80% e) need more information

c) 50%

The change in momentum that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a wall and bounces back at 2/0 m/s is ( p=mv for both velocities, then Δp=p2+p1 ) a) 2 kg m/s b) 4 kg m/s c) 6 kg m/s d) 8 kg m/s

c) 6 kg m/s

A 5000 kg freight car collides with a 10,000 kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000 kg car? ( mass x velocity + mass x 0 = (mass + mass ) (v) ) a) 4 m/s b) 5 m/s c) 6 m/s d) 8m/s e) none of the above

c) 6 m/s

A bullet is fired horizontally with an initial velocity of 300 m/s from a 20-m high tower. If air resistance is negligible, the bullet hits downrange about a) 200 m b) 500 m c) 600 m d) 300 m e) 400 m

c) 600 m

Two identical particles move toward each other, one twice as fast as the other. Just before they collide, one has a kinetic energy of 25 J and the other 50 J. At this instant their total kinetic energy is a) 25 J b) 50 J c) 75 J d) none of the above e) need more information

c) 75 J

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is a) zero b) less than 30 m/s but more than zero c) about 30 m/s d) more than 30 m/s

c) about 30 m/s

The rotational inertia of a pencil is greatest about an axis a) along its length, where the lead is b) about its midpoint, like a propeller c) about its end, like a pendulum

c) about its end, like a pendulum

Science, art, and religion do not contradict one another because a) choosing science means no need to heed religion and art b) choosing religion and art means no need to heed science c) all three involve different domains d) choosing the right one means no need to heed the other two

c) all three involve different domains

A hydraulic press, like an inclined plane, is capable of increasing energy a) sometimes true b) always true c) always false d) sometimes false

c) always false

A ball that gains speed as it rolls down a hill experiences a a) net torque b) net force c) both of these d) neither of these

c) both of these

If the Sun were twice as massive a) its pull on Earth would double. b) the pull of Earth on the Sun would double. c) both of these d) neither of these

c) both of these

The tapered shape of the wheel rims that ride on the railroad tracks allows opposite wheels to a) in effect, vary their diameters b) travel at different linear speeds for the same rotation speed c) both of these d) none of these

c) both of these

When a vertically falling firecracker bursts, the vector sum of momentum fragments a) in the vertical direction equals the momentum of the firecracker before bursting b) in the horizontal direction cancels to zero c) both of these d) neither of these

c) both of these

Which task requires more work? a) lifting the 50 kg sack 2 meters b) lifting the 25 kg sack 4 meters c) both require the same d) not enough information

c) both require the same

Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is a) greater with the haystack b) greater with the wall c) both the same

c) both the same

Which produces more force: driving into a very massive concrete wall with no " give", or having a head on collision with an identical car moving toward you at the same speed? a) car b) wall c) both the same d) need more information

c) both the same

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the a) force against the cannon is smaller than against the ball b) momentum is mainly concentrated in the cannonball c) cannon has much more mass than the cannonball d) momentum of the cannon is smaller

c) cannon has much more mass than the cannonball

centripetal force does no work on a circularly- moving object because a) no change in energy occurs b) rotational energy transfers to kinetic energy c) centripetal force has no component in the direction of motion d) none of the above

c) centripetal force has no component in the direction of motion

The bob of a conical pendulum swings in a a) to and fro path b) chaotic path c) circular path

c) circular path

When you do somersaults, you'll more easily rotate when your body is a) straight with both arms above your head b) straight with both arms at your sides c) curled into a ball shape d) no difference

c) curled into a ball shape

When riding at constant velocity on a Segway electric vehicle, your center of mass is a) slightly behind the point between wheels below b) slightly in front of the point between wheels below c) directly above the point between wheels below

c) directly above the point between wheels below

Which has the greater momentum when moving? a) a container ship b) a bullet c) either of these depending on speed

c) either of these depending on speed

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to a) follow a circular path b) slow down c) follow a straight-line path d) stop

c) follow a straight-line path

When we see a half Moon in the sky, the lines between Earth, Moon, and Sun a) are equal in length b) are parallel to one another c) form a right triangle d) all of the above

c) form a right triangle

When a dishonest scientist reports false information, he or she a) is elevated in the scientific community b) as in many other professions, will be excused by the scientific community c) gets no second chance in the scientific community

c) gets no second chance in the scientific community

If you toss a coin straight upward in train that gains speed while the coin is in the air, the coin will land a) as if you were at rest b) in front of you c) in back of you

c) in back of you

The amount of work done on a heavy box carried by Nellie across a room at constant speed a) depends on the weight of the box b) depends on the distance walked c) is none d) none of the above

c) is none

A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will likely have a) more momentum b) about the same momentum c) less momentum

c) less momentum

A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be a) the same b) less c) more

c) more

To produce an acceleration to a system there a) must be acceleration outside the system also b) may or may not be a net force on the system c) must be a net force on the system

c) must be a net force on the system

A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed a) northeast b) southeast c) nowhere- it cant be done d) east

c) nowhere- it cant be done

When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy a) less than 40 J b) more than 40 J c) of 40 J

c) of 40 J

The paths of fragments of fireworks are a) normally straight lines b) different from the paths of projectiles c) parabolas

c) parabolas

A rocket coasts in an elliptical orbit about the Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let "Fd = change in KE" guide your thinking.) a) same at any location b) same at either location c) perigee, where it is closest and fastest d) apogee, where it is farthest and slowest

c) perigee, where it is closest and fastest

The exhaust product from a hydrogen fuel cell is a) carbon dioxide b) methane c) pure water d) nitric acid

c) pure water

As you crawl toward the edge of a large freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable a) decreases b) increases c) remains the same, but the revolutions per minute decrease d) decreases in the direct proportion to your decrease in revolutions per minute e) none of these

c) remains the same, but the revolutions per minute decrease

When railroad tracks make a curve, the outer track is longer. This means a wheel that rides on the outer track needs to somehow a) roll slower than the wheel on the inner track b) maintain the same speed as the wheel on the inner track c) roll faster than the wheel on the inner track

c) roll faster than the wheel on the inner track

Centrifugal forces are an apparent reality to observers in a reference frame that is a) moving at constant velocity b) an inertial reference frame c) at rest d) rotating e) none of the above

c) rotating

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the a) heavier car b) lighter car c) same on each

c) same on each

Which would require the greater change in a satellite's orbital speed (8 km/s); slowing down so it crashes into Earth, or speeding up so it escapes Earth? a) speeding up b) same each way c) slowing down d) need more information

c) slowing down

The chef at the infamous fattening tower of pizza tosses a spinning disk of uncooked pizza dough into the air. The disk becomes wider during its flight, while its rotational speed a) remains constant b) quickens c) slows

c) slows

Two factors that greatly affect air resistance on falling objects are frontal area and a) mass b) weight c) speed

c) speed

Two equal-size vectors at right angles to each other have a resultant that is a) twice the length of either vector b) equal to that of either vector c) square root of two the length of either vector

c) square root of two the length of either vector

No work is done by gravity on a bowling ball that rolls along a bowling alley because a) no force acts on the ball b) little distance is covered by the ball c) the force on the ball is at right angles to the balls motion d) the balls speed remains constant

c) the force on the ball is at right angles to the balls motion

Earth pulls on the moon, and the moon pulls on the earth, which tells us that a) more massive objects pull harder b) both earth and moon circles a common point c) these two pulls comprise an action- reaction pair d) all of the above

c) these two pulls comprise an action- reaction pair

If you do work on a skateboard loaded with friends in one-third the usual time, you expend a) one third as much power b) the usual power c) three times the usual power d) need more information

c) three times the usual power

To kick a football so it won't topple end over end, kick it so the force of impact extends a) below its center of gravity b) above its center of gravity c) through its center of gravity

c) through its center of gravity

Strictly speaking ( in physics terms ), more fuel is consumed by your car if the air conditioner, headlights, or even radio is turned on. This statement is a) false b) true only if the cars engine is running c) true

c) true

Your weight is the force a) equal to your normal force on any surface b) due to gravity only c) you exert against a supporting surface

c) you exert against a supporting surface

A cart maintains a constant velocity of 100 m/s for 10 s. During this interval its acceleration is a) 10 m/s b) 1 m/s c) zero d) none of the above

c) zero

The gateway arch in st louis, missouri, is a

catenary

The kinetic energy of a planet is maximum when it is

closest to the sun

A 1 kg rock is suspended from the tip of a horizontal meter stick at the 0 cm mark so that the meter stick barely balances like a seesaw when its fulcrum is at the 25 cm mark. From this information, the mass of the meter stick is a) 1/4 kg b) 1/2 kg c) 3/4 kg d) 1 kg e) none of the above

d) 1 kg

A 2 kg rifle that is suspended by strings fires a 0.01 kg bullet at 200 m/s. the recoil velocity of the rifle is about a) 0.001 m/s b) 0.01 m/s c) 0.1 m/s d) 1 m/s e) none of these

d) 1 m/s

A hydraulic press has its input piston depressed 20 cm while the output piston is raised 1 cm. A 1 N input can lift a load of a) 1 N b) 10 N c) 15 N d) 20 N e) none of the above

d) 20 N

A hydraulic jack is used to lift objects such as automobiles. If the input force is 200 N over a distance of 1 m, the output force over a distance of 0.1 m is ideally a) 200 n b) 500 N c) 1000 N d) 2000 N e) none of the above

d) 2000 N

Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration? a) 0.3 m/s b) 30 m/s c) 10 m/s d) 3.0 m/s e) 300 m/s

d) 3.0 m/s

When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is a) 1500 N b) zero c) 6000 N d) 3000 N

d) 3000 N

The work done in pushing a TV set a distance of 2 m with an average force of 20 N is ( force x distance? ) a) 2 J b) 10 J c) 20 J d) 40 J e) 800 J

d) 40 J

Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of Gravitational potential energy initial = Kinetic energy final a) 10 J b) 500 J c) 510 J d) 5000 J e) more than 5000 J

d) 5000 J

A 2 kg ball is held 4 m above the ground. Relative to the ground its potential energy is ( PE = mgh ) a) 6 J b) 8 J c) 32 J d) 80 J e) more than 80 J

d) 80 J

A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h? a) 10 m b) 30 m c) 50 m d) 90 m

d) 90 m

The famous leaning tower of pisa doesnt topple over because its center of gravity is a) relatively low for such a tall building b) stabilized by its structure c) displaced from its center d) above a place of support e) in the same place as its center of mass

d) above a place of support

A freely-falling watermelon falls with constant a) speed b) distances each successive second c) velocity d) acceleration

d) acceleration

A circus diver drops from a high pole into water far below. When he is halfway down a) his potential energy is halved b) he has gained an amount of kinetic energy equal to half his initial potential energy c) his kinetic energy and potential energy are equal d) all of the above e) none of the above

d) all of the above

A truly educated person is knowledgeable about a) science b) religion c) the arts d) all of the above

d) all of the above

An object in mechanical equilibrium is an object a) having no changes in velocity b) at rest c) moving with constant velocity d) all of the above

d) all of the above

Compared with a force, a torque involves a) rotation b) leverage c) distance from an axis of rotation d) all of the above

d) all of the above

Technology is a tool that can a) be socially harmful when abused b) be socially beneficial c) lead to a better world d) all of the above

d) all of the above

To a fair approximation, Early Greens knew the a) size of the moon b) size of the earth c) earth - moon distance d) all of the above

d) all of the above

When the Sun shines on the Moon, the Moon casts a shadow a) at all times b) that sometimes falls on earth c) that is tapered d) all of the above

d) all of the above

You experience weightlessness A) in the absence of a supporting surface. B) momentarily when you step off a chair. C) in a freely falling elevator. D) all of the above

d) all of the above

A red car has a head on collision with an approaching blue car with the same magnitude of momentum. A green car driving with the same momentum as the other cars collides with an enormously massive wall. Which of the three cars will experience the greatest impulse? a) red car b) blue car c) green car d) all the time

d) all the same

A ball gains speed while rolling down a hill due mainly to a) its rotational inertia b) its angular acceleration c) a balanced torque d) an unbalanced torque

d) an unbalanced torque

When a ball falls downward, it may have a net force a) of zero b) equal to its weight minus air drag c) equal to its weight d) any of the above e) none of the above

d) any of the above

Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains a) ride on straight tracks b) are too heavy c) arent massive enough d) encounter opposing forces

d) encounter opposing forces

As a ball bounces from a floor, its acceleration off the floor between bounces is a) significantly less than g b) slightly more than g c) significantly more than g d) g

d) g

When Joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to a) potential energy b) energy of motion c) energy of rest d) heat

d) heat

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is a) gravity b) resistance c) the principle of continuation d) inertia

d) inertia

A ball is thrown upwards and caught when it returns. Compared with its initial speed in the presence of air resistance, the speed with which it is caught is always a) the same b) more c) cant be determined d) less

d) less

An object has gravitational potential energy due to its a) speed b) acceleration c) momentum d) location e) none of the above

d) location

Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is a) 15 m/s b) 33 m/s c) 10 m/s d) needs more information

d) needs more information

The most concentrated form of energy is a) wind b) fossil fuel c) geothermal d) nuclear

d) nuclear

Half-way to the center of a planet of uniform density, your weight compared to that at the surface would be a) zero b) three quarters c) one quarter d) one half e) the same as at the surface

d) one half

Strictly speaking, to weigh less in the northern hemisphere, you should move to a location farther a) west b) north c) east d) south ( toward the equator )

d) south ( toward the equator )

The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific a) fact b) hypothesis c) law or principle d) theory e) none of the above

d) theory

Tidal bulges on the Moon involve the concept of a) magnetism b) slight water on the moon c) elasticity d) torques

d) torques

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is a) zero b) unchanged c) four times as much d) twice

d) twice

An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of (dv= 1/2gt^2 ) a) 1 N b) 2 N c) 3 N d) 4 N e) 5 N

e) 5 N

A moving object has a) speed b) velocity c) momentum d) energy e) all of these

e) all of these

The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely, because a) other forces than earths gravity act on it b) it pulls as hard on earth as earth pulls on it c) it is kept aloft by ground control d) it is beyond the main pull of earths gravity e) its orbital period is 24 hours

e) its orbital period is 24 hours

A 1 kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about a) 0.5 J b) 1.0 J c) 1.5 J d) 2.0 J e) more than 2.0 J

e) more than 2.0 J

A light aluminum ball and a heavy lead ball of the same size roll down an incline. When they are halfway down the incline, they will have identical a) kinetic energies b) potential energies c) momentum d) inertias e) none of the above

e) none of the above

All places on earth would have high tides at the same instant if the a) moon did not revolve b) sun did not revolve c) sun did not rotate d) moon did not rotate e) none of the above

e) none of the above

The force of gravity does work on a satellite when it is in

elliptical orbit

in a hydraulic press operation, it is impossible for the

energy output to exceed the energy input

According to kepler, the speed of a planet is slowest when it is

farthest from the sun

according to kepler, the line from the sun to any planet sweeps out equal areas of space

in equal time intervals

An elephant radiates less heat for its size than smaller animals because

its radiating area is small compared to its volume

The effects of scaling are beneficial to swimmers in a race who are relatively

large

Compared with the period of satellites in close earth orbit, the period of satellites orbiting far from earth is

longer

A solid glass ball weighs 1 N. One with twice the diameter weighs

more than 4 N

the larger a turkey cooked in a conventional oven at a given temperature, the

more time per pound is needed

A 5 N block of wood is difficult to fully submerge in a pool of mercury because the buoyant force on the block when submerged is

much more than 5 N

when a living cell doubles in diameter, it has eight times the mass to be nourished, and the amount of membrane through which it feeds is

only four times as much

buoyant force is greater on a submerged 1 cubic centimeter block of

same on each

The fact that the weight of a brim-full container of water is unchanged whether or not something floats in it is nicely employed in

scotlands falkirk wheel

A very lightweight horizontal loop of wire is suspended from a fine spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to

stretch

Suspend your body from a pair of vertical ropes and the tension in each rope will be a) half your weight b) equal to your weight c) greater than your weight d) none of the above

a) half your weight

The force due to gravity that acts on a block of ice that slides down an icy ramp a) remains equal to mg at all angles b) decreases as the slope of the ramp increases c) becomes greatest when the ramp is vertical

a) remains equal to mg at all angles

When no force acts on moving objects their paths are normally a) straight lines b) circles c) ellipses d) all of the above

a) straight lines

The net force on any object in equilibrium is a) zero b) equal to its weight c) less than its weight d) non- zero when motion is involved

a) zero

A heavy ball hangs by a string, with a second string attached to its bottom. A quick pull on the bottom string will break the a) top string b) bottom string c) top or bottom string equally

b) bottom string

When you rub your hands together, you a) can push harder on one hand than the other b) cannot push harder on one hand than the other c) need more information

b) cannot push harder on one hand than the other

A simple method of measuring the distance between the Earth and the Moon is to place in your line of sight to the Moon a a) magnifying glass b) coin c) telescope d) meterstick

b) coin

The normal force that acts on a block of ice that slides on a ramp a) remains equal to mg at all angles b) decreases as the slope of the ramp increases c) becomes greatest when the ramp is vertical

b) decreases as the slope of the ramp increases

While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up a) make an action- reaction pair of forces b) do not make an action- reaction pair of forces c) need more information

b) do not make an action- reaction pair of forces

A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor a) ahead of the midpoint of the ceiling b) exactly below the midpoint of the ceiling c) behind the midpoint of the ceiling d) none of the above

b) exactly below the midpoint of the ceiling

Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the a) regular ball b) lead - filled ball c) same for both

b) lead- filled ball

Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity a) decreases with time b) remains constant c) increases with time

b) remains constant

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the a) air resistance acting against the ball b) acceleration of the ball c) balls pull on earth d) none of the above

c) balls pull on earth

Suspend your body from a pair of ropes slightly angled from the vertical and the tension in each rope will be a) equal your weight b) half your weight c) greater than half your weight d) none of these

c) greater than half your weight

A heavy block at rest is suspended by a vertical rope. When the block accelerates upward by the rope, the rope tension a) is less than its weight b) equals its weight c) is greater than its weight

c) is greater than its weight

A same size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater a) speed b) acceleration c) momentum d) all of the above e) none of the above

c) momentum

When a rocket ship gaining speed in outer space runs out of fuel, it a) gains speed for a short time, then shows down to a constant velocity b) gains speed for a short time, slows down, and eventually stops c) no longer gains speed

c) no longer gains speed

The winner in a tug-of-war exerts the greatest force on a) the opponent b) his or her end of the rope c) the ground

c) the ground

A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car? ( F= ma ) a) 500 N b) 1000 N c) 1500 N d) 2000 N e) none of these

d) 2000 N

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight? a) 600 N b) 1600 N c) 2000 N d) 2400 N e) none of the above

d) 2400 N Mass of crate: 400 kg Acceleration: 1 m/s^2 friction force: half the weight of crate Weight of crate: mg ( mass x gravitational force ) weight of crate: 400x10 = 4000 friction force: 2000 F-f= ma F= ma+f F= 400x1+2000 F=2400 N

Burl and Paul paint signs together on a scaffold. Compared to their weights plus the weight of the scaffold, the sum of tensions in the supporting ropes is a) less b) the same c) greater d) zero

b) the same

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is a) one sixth as much b) the same c) six times as much d) zero

b) the same

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is a) zero b) twice c) four times as much d) unchanged

b) twice

Earth continually moves about 30 km/s through space, which means the wall you stand next to also is moving at 30 km/s. When you jump vertically the wall doesn't slam into you because a) the speeds of you and earth cancel out b) you're moving horizontally just as fast as the wall c) your upward motion is small compared with earths speed d) motion of the sun counteracts your motion

b) you're moving horizontally just as fast as the wall

While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due to a) an unbalanced force b) your tendency to keep moving forward c) an equilibrium challenge

b) your tendency to keep moving forward

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is a) greater on the automobile b) greater on the golf cart c) the same for both

c) the same for both

Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie is then ( terminal velocity means it stays the same, velocity stays the same = no net force ) a) 90 n b) 250 N c) 410 N d) 500 N e) none of the above

d) 500 N

Spots of sunlight on the ground cast through openings between leaves in trees above are actually a) images of the sun b) part of a solar eclipse c) due to refraction of sunlight d) all of the above

a) images of the sun

A force is a vector quantity because it has both a) magnitude and direction b) mass and velocity c) action and reaction counterparts d) speed and direction

a) magnitude and direction

A light woman and a heavy man jump from an airplane at the same time and open their same size parachutes at the same time. Which person will get to a state of zero acceleration first? a) the light woman b) the heavy man c) both should arrive at the same time d) not enough information

a) the light woman

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on an isolated piece of tissue paper with his best punch. You a) agree that it can't be done b) have reservations about his assertion c) disagree, for a good punch easily delivers this much force

a) agree that it can't be done

Which of the following is a scientific statement a) candy bon bons contain no sugar b) there are things we will never know about c) matter is filled with undetectable particles d) there are parts of the universe that will never be discovered by humans e) none of the above

a) candy bon bons contain no sugar

If no external forces are acting on a moving object, it will a) continue moving at the same speed b) move slower and slower until it finally stops c) come to an abrupt halt d) none of the above

a) continue moving at the same speed

Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity a) decreases with time to reach the top b) remains constant c) increases with time to reach the top

a) decreases with time to reach the top

A coconut and a birds feather fall from a tree through the air to the ground below. The force of air resistance is a) greater on the coconut b) greater on the feather c) the same on each

a) greater on the coconut

When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension in each supporting vertical strand is a) half of her weight b) equal to the weight c) twice her weight d) none of the above

a) half of the weight

A pair of air pucks on an air table are set in motion when a compressed spring between them is released. If one puck moves with twice the speed of the other, then its mass is a) half the mass of the other b) the same mass as the other c) twice the mass as the other d) need more information

a) half the mass of the other

An educated scientific guess is a a) hypothesis b) theory c) either of these d) neither of these

a) hypothesis

Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the Moon as it is here on Earth because a) the mass of the car is independent of gravity b) the weight of the car is independent of gravity c) both of these d) neither of these

a) the mass of the car is independent of gravity

A tree stump is pulled northward by a 10-N force at the same time a 25-N force pulls it southward. The resultant force has a magnitude of a) 15 N northward b) 15 N southward c) 35 N northward d) 35 N southward

b) 15 N southward

Burl and Paul have a total weight of 1300 N. The tensions in the supporting ropes that support their scaffold add to 1700 N. The weight of the scaffold itself must be a) 300 N b) 400 N c) 500 N d) 600 N

b) 400 N

A vertical vector of 3 units combined with a horizontal vector of 4 units has a resultant of (3^2+4^2= ?^2 ) a) 1 unit b) 5 units c) 7 units

b) 5 units

It is correct to say that impulse is equal to a) momentum b) a corresponding change in momentum c) force multiplied by the distance it acts d) velocity multiplied by time

b) a corresponding change in momentum

Which of the following has the largest momentum relative to earths surface? a) a tightrope walker crossing Niagara falls b) a pickup truck speeding along a highway c) a mack truck parked in a parking lot d) the science building on campus e) a mouse running across your room

b) a pickup truck speeding along a highway

Facts in the field of science a) are absolute b) are changeable c) mean very little d) are more important than theories

b) are changeable

When you quickly jerk a cart forward that has a ball resting in the middle, the a) front of the cart hits the ball b) back of the cart hits the ball c) neither, for the ball rides along in the middle as the cart moves forward d) all of the above depending on how quickly the cart is pulled

b) back of the cart hits the ball

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the a) heavier car b) lighter car c) same on each

b) lighter car

A hockey puck sliding across the ice finally comes to rest because a) it seeks its proper and natural state b) of friction c) that's just the way it is

b) of friction

Neglecting air resistance, once a tossed ball leaves your hand a) no further forces act on it b) only the force due to gravity acts on it c) inertia becomes the force acting on it d) your tossing force remains while the ball goes upward e) your tossing force remains until it comes to a stop

b) only the force due to gravity acts on it

Inertia is defined as a a) force b) property of matter c) change in motion d) none of the above

b) property of matter

When Nellie Newton hangs at rest in the middle of a clothesline, tensions will be the same in each side of the rope when a) the lengths of each rope are the same b) the angles for both sides of the rope are equal c) she is in equilibrium

b) the angles for both sides of the rope are equal

A light woman and a heavy man jump from an airplane at the same time and open their same size parachutes at the same time. Which person will get to the ground first? a) the light woman b) the heavy man c) both should arrive at the same time d) not enough information

b) the heavy man

A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass? a) the one on earth b) the one on the moon c) they have the same mass d) not enough information

b) the one on the moon

An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration due to gravity on this planet? ( d=1/2at^2 ) a) 3 m/s^2 b) 6 m/s^2 c) 12 m/s^2 d) 15 m/s^2 e) none of the above

c) 12 m/s^2

A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car? ( F= ma ) a) 500 kg b) 1000 kg c) 1500 kg d) 3000 kg e) none of these

c) 1500 kg

a 300-kg bear grasping a vertical tree slides down at a constant velocity. The friction force between the tree and bear is (p=mv) a) 30 N b) 300 N c) 3000 N d) more than 3000 N

c) 3000 N

Jason weighs 150 N and sits on his big brother's shoulders. Big brother weighs 400 N. The support force supplied by the floor must be a) 150 N b) 400 N c) 550 N d) more than 550 N

c) 550 N

A 10 N falling object encounters 4 N of air resistance. The net force on the object is a) 0 N b) 4 N c) 6 N d) 10 N e) none of the above

c) 6 N

If an apple experiences a constant net force, it will have a constant a) velocity b) speed c) acceleration d) position e) more than one of the above

c) acceleration

If Nellie hangs from a horizontal bar that is supported by four vertical ropes, the tension in the ropes a) are each half of her weight b) are each equal to her weight c) add to equal her weight d) none of the above

c) add to equal her weight

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by a) Arnold, of course b) Suzie, surprisingly c) both the same, interestingly

c) both the same, interestingly

To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the a) force of contact is reduced b) relative velocity is less c) time of contact is increased d) time of contact is decreased e) none of the above

c) time of contact is increased

Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is a) 50 N and rope tension is 0 N b) 50 N and rope tension is also 50 N c) zero and rope tension is 50 N d) zero and rope tension is also zero

c) zero and rope tension is 50 N

If the mass of a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration a) quadruples b) doubles c) stays the same d) halves e) none of the above

d) Halves -- twice the mass means heavier so acceleration slows.

A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has a) more mass b) more momentum c) less stopping distance d) all of the above e) none of the above

d) all of the above

As the sloped surface supporting a shoe becomes steeper a) the shoes weight mg remains unchanged b) the normal force becomes less c) friction needed to keep it at rest increases d) all of the above e) none of the above

d) all of the above

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much a) inertia b) mass c) volume d) all of the above e) none of the above

d) all of the above

Eratosthenes' measurements of Earth's size involved a) a deep well in Syene b) a pillars shadow in Alexandria c) surveying the distance between Alexandria and Syene d) all of the above

d) all of the above

science is a body of knowledge that a) describes order in nature b) is an ongoing human activity c) condenses knowledge into testable laws d) all of the above e) none of the above

d) all of the above

When a pair of 10-N forces act on a box of candy, the net force on the box is a) zero b) about 14 N c) 20 N d) any of the above depending on the directions of the forces

d) any of the above depending on the directions of the forces

Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on a table? a) equilibrium b) friction c) support force d) inertia

d) inertia

When Peter tosses an egg against a sagging sheet, the egg doesn't break due to a) reduced impulse b) reduced momentum c) both of these d) neither of these

d) neither of these

The force that causes Earth to orbit the sun is the force of gravity, while the force needed to keep the Earth moving as it circles the sun is a) inertia b) due to gravity c) due to both inertia and gravity d) no force at all

d) no force at all