Exam #1

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

A) in the same direction as gravitational attraction.

As two objects moving toward each other due to gravity get closer, the acceleration of each A) increases. B) remains constant. C) decreases.

A) increases.

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) more. C) no different.

A) less.

Which rocket would require more fuel? A) one going from Earth to the Moon. B) one going from the Moon to Earth. C) both the same.

A) one going from Earth to the Moon.

The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes A) one-fourth. B) three-quarters. C) half. D) none of the above

A) one-fourth.

If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would A) quadruple. B) double. C) be eight times as much as now. D) be the same. E) none of the above

A) quadruple.

Earth is presently accelerating toward the Sun (centripetal acceleration). If the Sun collapsed into a black hole, this acceleration would A) remain the same. B) increase C) cease to exist D) decrease.

A) remain the same.

The force of gravity acting on you will increase if you A) stand on a planet with a shrinking radius. B) burrow deep inside earth C) both of these D) neither of these

A) stand on a planet with a shrinking radius.

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.

Inside a freely-falling runaway elevator, your A) weight is zero. B) acceleration is zero. C) gravitational interaction with Earth is zero. D) all of the above E) none of the above

A) weight is zero.

Action and reaction pairs of forces A. always act simultaneously B. are independent of time C. may or may not act simultaneously

A. Always act simultaneously

When you stand at rest on a pair of bathroom scales, the reading on each scale A. add up to equal your weight B. equals your weight C. is half your weight

A. adds up to your weight

you can swing your legs to and fro more frequently when your legs are A. bent B. same either way C. straight

A. bent

A cannon recoils while firing a cannonball. the speed of the cannon's recoil is relatively small because the A. cannon has much more mass than the cannonball B. momentum is mainly concentrated in the cannonball C. momentum of the cannon is smaller D. force against the cannon is smaller than against the ball

A. cannon has much more mass than the cannonball

When you rub your hands together, you A. cannot push harder on one hand than the other B. can push harder on one hand than the other C. need more information

A. cannot push harder one one hand than the other

a coin and a ring roll down an incline at the same time. the one to first reach the bottom is the A. coin B. ring C. both reach the bottom at the same time

A. coin

If earth's radius somehow increased with no change in mass, your weight would A. decrease B. stay the same C. increase also

A. decrease

the net force exerted on a car traveling in a circular path at constant speed is A. directed toward the center of the curve B. directed forward, in the direction of travel C. zero because the car is not accelerating D. none of the above

A. directed toward the center of the curve

The force with which earth pulls on the moon is A. equal in magnitude to the force that moon pulls on earth B. somewhat greater than moons pull on earth C. the only force acting between earth and moon

A. equal in magnitude to the force that moon pulls on earth

When a boxer hits a punching bag, the strength of his punch depends on how much force the bag can A. exert on the boxer's fist B. endure C. soften

A. exert on the boxer's fist

When you drop a rubber ball on the floor it bounces back. the force exerted on the ball to produce bouncing is by the A. floor B. ball C. need more info

A. floor

the force that accelerates the orange and apple system featured in your textbook is actually supplied by the A. floor B. orange C. apple

A. floor

The gravitational field simulated by rotation in a space habitat that is best suited for humans is A) g. B) one-half g. C) zero. D) three-quarters g. E) one-quarter g.

A. g

If a non-rotating object has no acceleration, then we can say for certain that it is A. in mechanical equilibrium B. moving at constant non-zero velocity C. at rest D. all of the above E. none of the above

A. in mechanical equilibrium

If the mass of earth somehow increased with no change in radius, your weight would A. increase also B. stay the same C. decrease

A. increase also

When a twirling ice skater brings her arms inward, her rotational speed A. increases B. remains the same C. decreases

A. increases

Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on a table? A. inertia B. support force C. friction D. equilibrium

A. inertia

a sheet of paper can be quickly jerked beneath a container of milk without toppling, which best demonstrates A. inertia B. the difference between force and mass C. net force

A. inertia

a heavy block at rest is suspended by a vertical rope. when the block accelerates upward by the rope, the rope tension A. is greater than its weight B. is less than its weight C. equals its weight

A. is greater than its weight

If the net force on a cart is tripled, the cart's acceleration A. is three times as much B. is one third C. is more than three times as much D. is two thirds

A. is three times as much

A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is A. its ratio of force to mass is the same B. an experimental fact tested many times C. that in free fall all accelerations are g D. none of the above

A. its ratio of force to mass is the same

If you can't avoid being hit by a fast-moving object, you'll suffer a smaller contact force if you can extend that force over a A. longer time B. both the same C. shorter time

A. longer time

If the sun became twice as massive, your attraction to the sun would double your weight as measured on earth would A. not change B. quadruple C. double

A. not change

A pair of action-reaction forces always A. occur simultaneously B. act on the same object C. comprise a pair of interactions D. all of the above E. none of the above

A. occur simultaneously

A hockey puck sliding across the ice finally comes to rest because A. of friction B. it seeks its proper and natural state C. thats just the way it is

A. of friction

which horse moves faster in m/s on a merry-go-round? A. one near outer rail B. both move at the same speed in m/s C. one near inner rail

A. one near outer rail

When you walk, you push on the floor to the left and the floor A. pushes you to the right B. both of these simultaneously C. also pushes on you to the left D. can only wish it could push on you E. none of the above

A. pushes you to the right

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized A. rates of time B. the acceleration of free fall C. the role of distance in describing motion D. none of the above

A. rates of time

Galileo's use of inclined planes allowed him to effectively A. slow down the ball's changes in speed B. eliminate all changes in speed C. reduce the time of the ball's changes in speed D. eliminate friction

A. slow down the ball's changes in speed

A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first? A) sphere B) disk C) ring D) all reach the bottom at the same time E) need more information

A. sphere

If gravity between the sun and earth suddenly vanished, earth would continue moving in A. straight line path B. an outward spiral path C. an inward spiral path D. a curved path

A. straight line path

Which pulls on the oceans of earth with a greater force? A. sun B. moon C. both pull the same

A. sun

When a tennis racquet hits a ball, A. the ball hits the racquet B. the racquet loses as much speed as the ball gains C. the ball is set in motion with the same speed of the racquet upon contact D. all of the above

A. the ball hits the racquet

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 heavy man B. the light woman C. both should arrive at the same time D. not enough information

A. the heavy man

an automobile and a golf cart traveling at the same speed collide head-on. the impact force is A. the same for both B. greater on the golf cart C. greater on the automobile

A. the same for both

Harry pulls on the end of a spring attached to a wall. The reaction to harrys pull on the spring is A. the spring pulling on harry B. the wall pulling oppositely on the spring C. both the wall and the spring pulling on harry D. none of the above

A. the spring pulling on harry

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

A. weight

If Earth's mass decreased to one-half its original mass with no change in radius, then your weight would A) stay the same. B) decrease to half. C) decrease to one-quarter. D) none of the above

B) decrease to half.

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) three times greater. B) four times greater. C) twice. D) none of the above

B) four times greater.

When the distance between two stars decreases by one-third, the force between them A) decreases by one-half. B) increases to nine times as much. C) decreases by one-third. D) increases to twice as much. E) none of the above

B) increases to nine times as much.

According to Newton, when the distance between two interacting objects doubles, the gravitational force is A) four times as much. B) one-quarter. C) twice as much. D) half. E) the same.

B) one-quarter.

Your weight is the force A) equal to your normal force on any surface. B) you exert against a supporting surface. C) due to gravity only

B) you exert against a supporting surface.

A 10-N falling object encounters 10N of air resistance. The net force on the object is A. 4 N B. 0 N C. 6 N D. 10 N E. none of these

B. 0 N

If an object's mass is decreasing while a constant force is applied to the object, the acceleration A. remains the same B. increases C. decreases

B. Increases

The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is A) relatively low for such a tall building. B) above a place of support. C) in the same place as its center of mass. D) stabilized by its structure. E) displaced from its center.

B. above a place of support

A constant net force on a rail-road car produces constant A. velocity B. acceleration C. both of these D. neither of these

B. acceleration

If an apple experiences a constant net force, it will have a constant A. position B. acceleration C. speed D. velocity E. more than one of the above

B. acceleration

as a ball falls, the action force is the earth's pull on the ball. the reaction is the A. air resistance acting against the ball B. balls pull on earth C. acceleration of the ball D. none of the above

B. balls pull on earth

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. both the same C. greater with the brick wall

B. both the same

Arnold strongman and Suzie small each pull very hard on opposite ends of a rope in a tug-of-war. the greater force on the rope is exerted by A. susie, surprisingly B. both the same, interestingly C. Arnold, of course

B. both the same, interestingly

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

If a turntable's rotational speed is doubled, then the linear speed of a pet hamster is sitting on the edge of the record will A. halve B. double C. remain the same

B. double

If an object is placed exactly halfway between earth and the moon, it would fall toward the A. moon B. earth C. neither of these

B. earth

the force that propels a cannonball when fired from a cannon is A. in some cases, equal and opposite to the force the ball exerts on the cannon B. equal and opposite to the force the ball exerts on the cannon C. huge compared to the recoil force on the cannon

B. equal and opposite to the force the ball exerts on the cannon

a player hits a ball with a bat. if action is the force of the bat against the ball, reaction is the A. weight of the bat B. force that the ball exerts on the bat C. weight of the ball D. air resistance on the ball E. grip of the player's hand against the ball

B. force that the ball exerts on the bat

Suspend your body from a pair of vertical ropes and the tension in each rope will be A. equal to your weight B. half your weight C. greater than your weight D. none of the above

B. half your weight

An object with twice as much mass as another object has twice as much A. acceleration due to gravity B. inertia C. equal to your mass D. all of the above

B. inertia

A same-size iron ball and a 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. momentum C. acceleration D. all of the above E. none of the above

B. momentum

an industrial flywheel has a greater rotational inertia when most of its mass is A. nearer the axis B. nearer the rim C. uniformly spread out as in a disk

B. nearer the rim

When a rocket ship gaining speed in outer spaces runs out of fuel, it A. gains speed for a short time, then slows down to a constant velocity B. no longer gains speed C. gains speed for a short time, slows down, and eventually stops

B. no longer gains speed

Centrifugal forces are an apparent reality to observers in a reference frame that is A) an inertial reference frame. B) rotating. C) moving at constant velocity. D) at rest. E) none of the above

B. rotating

A torque acting on an object tends to produce A) velocity. B) rotation. C) linear motion. D) equilibrium. E) a center of gravity.

B. rotation

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

B. same on each

A fast-moving missile soaring overhead possesses A. force B. speed C. both of these D. neither of these

B. speed

two factors that greatly affect air resistance on falling objects are frontal area and A. mass B. speed C. weight

B. speed

When no forces act on moving objects their paths are normally A. ellipses B. straight lines C. circles D. all of the above

B. straight lines

The attraction between earth and sydney is equal to her weight. the reaction to earth's pull on sydney is A. The support of earth's surface on sydney B. sydney's pull on earth C. sydney pushing against earth's surface D. none of the above

B. sydney's pull on earth

Newton discovered A. gravity B. that gravity is universal C. neither of these

B. that gravity is universal

when a cannonball is fired from a cannon, which undergoes the greater acceleration? A. the recoiling cannon B. the cannonball C. both the same

B. the cannonball

Which jar will roll down an incline in the shortest time, an empty one or one filled with peanut butter? A. both reach the bottom at the same time B. the filled jar C. the empty jar D. need more information

B. the filled jar

Your weight as measured on your bathroom scale is A. a property of mechanical equilibrium B. the force due to gravity on you C. equal to your mass D. all of the above

B. the force due to gravity on you

The winner in a tug-of-war exerts the greatest force on A. the opponent B. the ground C. his or her end of the rope

B. the ground

If you bounce up and down on a bathroom scale, what varies on the scale reading is A. mg B. the normal force C. both of these D. neither of these

B. the normal force

A feather and a coin will have equal accelerations when falling in a vacuum because A. their velocities are the same B. the ratio of both the feather's and coin's weight to mass is the same C. the force of gravity is the same for each in a vacuum D. the force of gravity does not act in a vacuum E. none of the above

B. the ratio of both the feathers and coins weight to mass is the same

A car traveling at 100km/h strikes an unfortunate bug and splatters it. the force of impact is A. greater on the car B. the same for both C. greater on the bug

B. the same for both

To say there is no such thing as only one force means A. other forces, perhaps not evident, are there B. there must also be a corresponding reaction force C. gibberish

B. there must also be a corresponding reaction force

Earth pulls on the moon, and the moon pulls on the earth, which tells us that A. both earth and moon circle a common point B. these two pulls comprise an action-reaction pair C. more massive objects pull harder D. all of the above

B. these two pulls comprise an action-reaction pair

You cannot exert a force on a wall A. if the wall resists B. unless the wall simultaneously exerts the same amount of force on you C. unless you put your mind to it

B. unless the wall simultaneously exerts the same amount of force on you

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. same for both B. volkswagon C. mack truck

B. volkswagon

the force required to maintain a constant velocity for an astronaut in free space is equal to A. the mass of the astronaut B. zero C. the force required to stop the astronaut D. the weight of the astronaut E. none of the above

B. zero

A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater? A) the force on A B) the force on B C) both forces are the same.

C) both forces are the same.

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

According to Newton, the greater the masses of interacting objects, the A) less the gravitational force between them. B) greater the force between them by the square of the masses. C) greater the gravitational force between them.

C) greater the gravitational force between them.

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them A) remains constant. B) decreases. C) increases.

C) increases.

If the Moon had twice as much mass and still orbits Earth at the same distance, ocean bulges on Earth would be A) unequal in size. B) not significantly different. C) larger. D) smaller. E) none of the above

C) larger.

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

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

Tidal forces in general are the result of A) a combination of any kind of forces acting on a body. B) the inverse-square law. C) unequal forces acting on different parts of a body. D) two or more sources of gravitation. E) unequal fluid flow

C) unequal forces acting on different parts of a body.

The first scientist to be credited for postulating that earth circled the sun was A. Aristotle B. Newton C. Copernicus D. Galileo

C. Copernicus

The first scientist to introduce the concept of inertia was A. Copernicus B. Newton C. Galileo D. Aristotle

C. Galileo

A ring and a disk both at rest roll down a hill together. Which rolls slower? A) depends on the masses B) both roll at the same speed C) ring D) disk E) need more information

C. Ring

the rotational inertia of a pencil is greatest about an axis A. about its midpoint, like a propeller B. along its length, where the lead is C. about its end, like a pendulum

C. about its end, like a pendulum

A ball gains speed while rolling down a hill due mainly to A. a balanced torque B. its angular acceleration C. an unbalanced torque D. its rotational inertia

C. an unbalanced torque

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 within the orbital path of the moons. B) inside the Earth, but off center. C) at the center of the Earth. D) outside the Earth, but beyond the orbital path of the moons.

C. 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) same either way C) at the top, away from your hand.

C. at the top, away from your hand

A ball that gains speed as it rolls down a hill experiences a A. net force B. net torque C. both of these D. neither of those

C. both of these

For a system in mechanical equilibrium, the resultant A. torque must be zero B. force must be zero C. both of these D. none of these

C. both of these

If no external forces act on a moving object, it will A. come to an abrupt halt B. move slower and slower until it finally stops C. continue moving at the same speed D. none of the above

C. continue moving at the same speed

the emphasis of the orange-and-apple sequence in your textbook is A. mass is not a force B. friction is a force C. defining systems D. actions equal reactions E. forces produce accelerations

C. defining systems

When a rocket forces exhaust gases downward, the exhaust gases A. play no further role in the motion of the rocket B. as the name implies, soon exhaust their influence C. exert an upward force on the rocket

C. exert an upward force on the rocket

Science later greatly advanced when Galileo favored A. non-mathematical thinking B. philosophical discussions over experiment C. experiment over philosophical discussions D. none of the above

C. experiment over philosophical discussions

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. stop B. follow a circular path C. follow a straight-line path D. slow down

C. follow a straight line path

a flywheel's diameter is twice that of another of the same shape and mass. rotational inertia of the larger flywheel is A. half B. the same as the other's C. four times greater D. two times greater

C. four times greater

As a ball bounces from a floor, its acceleration off the floor between bounces is A. slightly more than g B. significantly more than g C. g D. significantly less than g

C. g

Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is A. both the same B. greater with the haystack C. greater with the brick wall

C. greater with the brick wall

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. the same mass as the other B. twice the mass as the other C. half the mass as the other D. need more information

C. half the mass as the other

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. light rock B. same for both C. heavy rock

C. heavy rock

The lift experienced by a helicopter involves an action-reaction pair of forces between the A. weight of the helicopter and atmospheric pressure B. mass of the helicopter and earth's mass C. helicopter blades and the air D. motion of the helicopter relative to the ground below E. any or all of the above

C. helicopter blades and the air

When a boxer moves into an oncoming punch, the force experienced is A. no different, but the timing is different B. decreased C. increased D. all of the above

C. increased

If your automobile runs out of fuel while driving, the engine stops. you don't come to an abrupt stop due to A. gravity B. the principle of continuation C. inertia D. resistance

C. inertia

When you flick a card from beneath a coin that hardly moves, your illustrating A. support force B. friction C. inertia D. equilibrium

C. inertia

Whenever the net force on an object is zero, the acceleration is A. may be less than zero B. may be more than zero C. is zero

C. is zero

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. same on each C. light car

C. lighter car

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

C. lower

Which is most responsible for earths ocean tides? A. sun B. both contribute equally C. moon

C. moon

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

The amount of force needed to sustain motion of a rock in outer space is A. a force equal to its weight B. a force less than its weight if friction is absent C. none of these

C. none of these

Neglecting air resistance, once a tossed ball leaves your hand A. no further forces act on it B. your tossing force remains until it comes to a stop C. only the force due to gravity acts on it D. inertia becomes the force acting on it E. your tossing force remains while the ball goes upward

C. only the force due to gravity acts on it

Inertia is defined as a A. change in motion B. force C. property of matter D. none of the above

C. property of matter

When a star collapses to form a black hole, its mass A. decreases B. increases C. remains the same

C. remains the same

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 in direct proportion to your decrease in revolutions per minute. B) increases. C) remains the same, but the revolutions per minute decrease. D) decreases. E) none of these

C. remains the same, but the revolutions per minute decrease

If you double the net force on an object, you'll double its A. acceleration B. velocity C. speed D. all of the above

C. speed

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

C. the same

When a boxer is moving away from an oncoming punch, the force experienced is reduced because A. momentum transferred is reduced B. the force is less effective C. the time of contact is increased D. all of the above

C. the time of contact is increased

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

If Alex wishes to rotate his skateboard, then he must apply a A) rotational maneuver. B) pause before bearing down on the board. C) torque.

C. torque

consider two flywheels of the same size and shape, but one with twice the mass. rotational inertia of the more massive one is A. the same as the other one B. half C. two times greater D. four times greater

C. two times greater

The net force on any object in equilibrium is A. less than its weight B. equal to its weight C. zero D. non-zero when motion is involved

C. zero

when a falling object has reached its terminal velocity, its acceleration is A. constant B. g C. zero

C. zero

You can experience weight A) in an accelerating elevator away from Earth. B) standing on Earth's surface. C) in a rotating habitat in space. D) all of the above

D) all of the above

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

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

Suppose the Moon had twice the diameter but the same mass and same orbital distance from Earth. In that case, the high tides on Earth would be A) higher. B) unequal in size. C) lower. D) practically the same. E) none of the above

D) practically the same.

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) slow down until it reaches Earth's center. B) speed up until it reaches Earth's other side. C) come to an abrupt stop at Earth's center. D) speed up until it gets to Earth's center.

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

The earliest and most influential Greek philosopher was Aristotle, who among many contributions taught that? A. the four elements are earth, water, air, and fire B. violent motion requires a sustained push or poll C. all motion is either natural or violent 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. distance from an axis of rotation B. rotation C. leverage D. all of the above

D. all of the above

When a skateboarder pushes on a wall, A. an interaction occurs between the skateboarder and the wall B. such a push couldn't happen unless the wall pushed on the skateboarder C. the wall pushes on the skateboarder D. all of the above E. none of the above

D. all of the above

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

D. all of the above

which has zero acceleration? an object A. in mechanical equilibrium B. at rest C. moving at constant velocity D. all of the above E. none of the above

D. all of the above

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

An archer shoots an arrow. consider the action force to be the bowstring against the arrow. The reaction to this force is the A. combined weight of the arrow and bowstring B. grip of the archers hand on the bow C. friction of the ground against the archers feet D. arrows push against the bowstring

D. arrows push against the bowstring

The force that accelerates a rocket in outer space is exerted on the rocket by the A. atmospheric pressure B. rocket's wings C. rocket's nose cone D. exhaust gases E. none of the above

D. exhaust gases

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. stays the same B. quadruples C. doubles D. halves E. none of these

D. halves

If the rotational speed of a rotating habitat increases, the weight experienced by occupants A. decreased B. is always zero C. stays the same D. increases

D. increases

For every action force, there must be a reaction force that A. is slightly larger in magnitude than the action force B. is slightly smaller in magnitude than the action force C. acts in the same direction D. is equal in magnitude

D. is equal in magnitude

Galileo taught us that if you roll a ball along a level surface it will A. soon slow down due to its natural place B. roll as long as its inertia nudges it along C. soon roll in the opposite direction D. keep rolling if friction is absent

D. keep rolling if friction is absent

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is A. equal to its weight B. equal to its mass times its weight C. equal to its weight D. none of the above

D. none of the above

Compared to the mass of an apple on earth, the mass of the apple on the moon is A. one sixth as much B. zero C. six times as much D. the same

D. the same

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) four times as much. C) twice as much. D) half as much. E) none of the above

E) none of the above

a player catches a ball. If action is the force of the ball against the player's glove, reaction is the A. muscular effort in the player's arm B. glove against the ball C. players grip on the glove D. friction of the ground against the players shoes E. none of the above

Glove against the ball