Semester 1 Physics MC

An apple weighs 1 N. When held at rest above your head, the net force on the apple is a. 0 N b. 0.1 N c. 1 N d. 9.8 N

a. 0 N

Which object has the LEAST momentum: a. 1 kg object moving +100m/s b. 10 kg object moving +12 m/s c. 0.5 kg object moving +1000 m/s d. 100 kg object moving +2 m/s

a. 1 kg object moving +100m/s

An object moving with constant speed travels once around a circular path. Which of the following is/are true concerning this motion? 1. The displacement is zero 2. The average/speed is zero 3. The acceleration is zero a. 1 only b. 1 and 2 only c. 1 and 3 only d. 3 only e. 2 and 3 only

a. 1 only

A 10-N force and a 30-N force act in the same direction on an object. What is the net force on the object? a. 40 N b. 30 N c. 20 N d. 10 N

a. 40 N

For which of the following is the velocity constant? a. A boat being carried down a straight river by a steady current. b. A baseball traveling away from a bat after a hit. c. A race car on an oval track moving at a constant speed of 375 km/h. d. A drone hovering motionless above the football team at practice.

a. A boat being carried down a straight river by a steady current.

What happens when two objects with magnetic fields are brought near each other? a. A magnetic force either causes attraction or repulsion b. A magnetic force will cause electrical charges c. The objects will become magnets.

a. A magnetic force either causes attraction or repulsion

Which of the following is NOT an example of an object accelerating? a. An object moving extremely fast b. An object changing speed c. An object moving in a circle d. All are examples of acceleration

a. An object moving extremely fast

According to Kepler's second law, a planet must move fastest when it is ________ the Sun. a. At perihelion from b. Farthest from c. At aphelion from

a. At perihelion from

In the circular motion lab, the relationship between centripetal force and velocity was... a. Direct b. Inverse c. No relationship could be determined from the data

a. Direct

An object weighing 40 N on the Earth's surface would weigh only 10 N when its distance from the center of the Earth is a. Doubled b. Halved c. Tripled d. Quadrupled

a. Doubled

A rubber balloon possesses a positive charge. If brought near and touched to the door of a wooden cabinet, it sticks to the door. This does not occur with an uncharged balloon. These two observations can lead one to conclude that the wall is ________. a. Electrically neutral b. Negatively charged c. A conductor d. Lacking electrons

a. Electrically neutral

Which one of the following statements is NOT true of a free-falling object? An object in a state of free fall _____ a. Falls with a constant speed of -9.8 m/s b. Falls with an acceleration of -9,8 m/s/s c. Falls under the sole influence of gravity d. Falls with downward acceleration which has a constant magnitude

a. Falls with a constant speed of -9.8 m/s

While rollerblading, Granny collides with her tiny grandson Ambrose who is at rest. Ignoring any friction effects, Ambrose's speed after the collision will be greatest when __________. a. He and Granny make a bouncing collision, each going their separate ways. b. Granny catches him and they both move together.

a. He and Granny make a bouncing collision, each going their separate ways.

Cars are equipped with padded dashboards. In collisions, the padded dashboards would be safer than non padded ones because they _____. a. Increase the impact time b. Decrease an occupant's impulse c. Increase the impact force d. None of the above

a. Increase the impact time

One object has twice as much mass as another object. The first object also has twice as much a. Inertia b. Velocity c. Gravitational acceleration d. All of the above

a. Inertia

Which of the following contains only two scalar quantities? a. Mass, force, speed, velocity b. Displacement, acceleration, velocity, speed c. Speed, displacement, mass, time d. Displacement, velocity, acceleration, mass

a. Mass, force, speed, velocity

If the velocity vs. time graph of an object is a horizontal line, the object is a. Moving with a constant non-zero speed. b. Moving with constant non-zero acceleration. c. At rest d. Moving with infinite speed.

a. Moving with a constant non-zero speed.

An object undergoing free fall motion. As it falls, the object's _______. a. Speed increases b. Acceleration increases c. Both of these d. None of these

a. Speed increases

As an object freely falls, its _________ a. Speed increases b. Acceleration increases c. Both of these d. None of these

a. Speed increases

Magnetic field strength is a. Strongest close to a magnet b. Strongest far from a magnet c. Constant everywhere around a magnet

a. Strongest close to a magnet

Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater acceleration? a. The moth b. Your car c. Both the same

a. The moth

Two crates are stacked on top of each other on a horizontal floor; Crate #1 is on the bottom, and Crate #2 is on the top. Both have the same mass. Compared to the strength of the force F1 necessary to push only Crate #1 at a constant speed across the floor, the strength of the force F2 necessary to push the stack at the same constant speed across the floor is greater than F1 because a. The normal force on Crate #1 is greater b. The coefficient of kinetic friction between Crate #1 and the floor is greater c. The force of kinetic friction, but not the normal force on Crate #1 is greater d. The coefficient of static friction between Crate #1 and the floor is greater e. The weight of Crate #1 is greater

a. The normal force on Crate #1 is greater

When there is no air resistance, objects of different masses. a. fall at equal acceleration with similar displacements. b. fall at different acceleration with different displacements. c. fall at equal acceleration with different displacements. d. fall at different acceleration with similar displacements.

a. fall at equal acceleration with similar displacements.

Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour? a. the large truck b. the small truck c. both have the same momentum

a. the large truck

Convert 23 degrees to radians. a. 20.7 radians b. 0.408 radians c. 7.32 radians d. 72.2 radians

b. 0.408 radians

An object is dropped and falls freely to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration would be _____. a. 0 g b. 1 g downward c. 1 g upward d. larger than 1 g e. none of the above

b. 1 g downward

Which is complete descriptions of the momentum of an object? a. 2.0 kg/s b. 1.9 kg*m/s, west c. 2.3 kg*m/s d. 6.1 kg*m/s/s, down

b. 1.9 kg*m/s, west

The mass of a dog that weighs 100 N is about a. 1 kg b. 10 kg c. 100 kg d. 1000 kg e. None of the above

b. 10 kg

A cannonball is fired at some angle into the air. In the first second it moves 10 meters horizontally. Assuming it doesn't hit the ground and air resistance is small, how far does it move horizontally in the next second? a. more than 10 m b. 10 m c. less than 10 m d. there's not enough information to say

b. 10 m

A 10-kg brick and a 1-kg brick are dropped in a vacuum. The force of gravity on the 10 kg brick is a. The same as the force on the 1-kg book. b. 10 times as much as the force on the 1-kg book c. Zero

b. 10 times as much as the force on the 1-kg book

How much force is needed to accelerate a 2-kg physics book to an acceleration of 6 m/s/s? a. 36 N b. 12 N c. 3 N d. 0.33 N e. 0 N

b. 12 N

A cannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 20 m/s. Ideally (no air resistance) the ball will land on the ground with a speed of _______. a. 40 m/s b. 20 m/s c. 10 m/s d 0 m/s

b. 20 m/s

A woman weighing 500 N sits on the floor. She exerts a force on the floor of a. 100 N b. 500 N c. 250 N d. 50 N

b. 500 N

When a woman stands at rest with both feet on a scale, it reads 500 N. When she gently lifts one foot, the scale reads a. 250 N b. 500 N c. 1000 N

b. 500 N

Which of the following has the largest momentum? a. A tightrope walker crossing Niagara Falls b. A pickup truck traveling down the highway c. A Mack truck parker in a parking lot d. The science building at your school e. A dog running down the street

b. A pickup truck traveling down the highway

If an object has an acceleration of 0 m/s/s, then one can be sure that the object is not a. Changing position b. Changing velocity c. Moving

b. Changing velocity

Is a magnet a dipole or a monopole? a. Monopole, because it is one magnet b. Dipole, because it has two poles c. It depends if the poles are like or different

b. Dipole, because it has two poles

Which of the following quantities are vectors? Include all that apply? a. Distance traveled b. Displacement c. Average speed d. Average velocity e. Instantaneous velocity f. Acceleration

b. Displacement d. Average velocity e. Instantaneous velocity f. Acceleration

A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its velocity is _______. a. Entirely vertical b. Entirely horizontal c. Both vertical and horizontal d. Not enough information to know

b. Entirely horizontal

Many cars are made with an automatic feature called cruise control. When the driver sets a car on cruise control, a computer adjusts the engine to maintain the car's speed constant. When a car is on cruise control on a straight road, the acceleration of the car is best described as: a. Equal to the initial speed when the cruise control was set. b. Equal to zero c. Greater than it was before the cruise control was set. d. Less than it was before the cruise control was set.

b. Equal to zero

Accelerations are produced by a. Velocities b. Forces c. Masses d. Inertia

b. Forces

An object following a straight-line path at constant speed a. Has a net force acting on it in the direction of motion b. Has zero acceleration c. Must be moving in a vacuum d. Has no forces acting on it

b. Has zero acceleration

How does acceleration of an object change in relation to its mass? It is a. Directly proportional b. Inversely proportional c. Acceleration doesn't depend on mass at all

b. Inversely proportional

If the force on a cart doubles, what happens to the cart's acceleration? a. It quadruples b. It doubles c. It halves d. It stays the same

b. It doubles

The momentum of an object is defined as the object's ______. a. Mass times its acceleration b. Mass times its velocity c. Force times its acceleration d. Force times the time interval e. Velocity times the time interval

b. Mass times its velocity

The SI unit of acceleration is: a. Meters per second b. Meters per second squared c. Miles per hour d. Kilometers per hour

b. Meters per second squared

He was the first to believe in the heliocentric model. a. Tycho Brahe b. Nicolaus Copernicus c. Ptolemy d. Isaac Newton

b. Nicolaus Copernicus

The force on the scale is the same as the a. Force of gravity b. Normal force c. Force perpendicular d. Force parallel

b. Normal force

A heavy person and a light person parachute together and wear the same size parachutes. Assuming they open their parachutes at the same time, which person reaches the ground first? a. The light person b. The heavy person c. Neither - they both reach the ground together

b. The heavy person

When velocity is positive and acceleration is negative, what happens to the object? a. The object speeds up b. The object slows down c. The object changes direction d. The object remains at rest

b. The object slows down

Compared to a sport car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has a. The same momentum b. Twice the momentum c. Four times as much momentum

b. Twice the momentum

In our circular motion lab, centripetal force was the same as the... a. Weight of the stopper b. Weight of the masses c. Mass of the masses d. Radius of the string

b. Weight of the masses

The Impulse of an object is equal to ______. a. momentum. b. the change in momentum. c. the object's mass times the force acting on it. d. the force acting on it times its velocity.

b. the change in momentum.

Momentum of a system is conserved only when a. there are no forces acting on the system. b. there is no net external force acting on the system. c. there are no internal forces acting on the system. d. the system is not moving e. the system has zero momentum

b. there is no net external force acting on the system.

Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In order to get off the ice, she can _______. a. bend over touching the ice in front of her, then bring her feet to her hands. b. throw something in the direction opposite to that in which she wants to go. c. walk very slowly on tiptoe. d. get on her hands and knees and crawl off the ice.

b. throw something in the direction opposite to that in which she wants to go.

A ball of mass 0.5 kg, initially at rest, acquires a speed of 4 m/s immediately after being kicked by a force of strength 20 N. For how long did this force act on the ball? a. 0.01 s b. 0.02 s c. 0.1 s d. 0.2 s e. 1 s

c. 0.1 s

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy ball that is initially at rest. After the putty sticks to the ball, both are set in motion with a combined momentum that is ______. a. less than 1 unit b. more than 1 unit c. 1 unit d. not enough information to say

c. 1 unit

The acceleration of gravity on the moon is about 1.6 m/s/s. A 2-kg object on the moon is dropped from rest. After ten seconds, the speed of the object is: a. 1.6 m/s b. 3.2 m/s c. 16 m/s d. 32 m/s

c. 16 m/s

Which of the following is/are true? 1. If an object's acceleration is constant, then it must move in a straight line. 2. If an object's acceleration is zero, then its speed must remain constant. 3. If an object's speed remains constant. then its acceleration must be zero. a. 1 and 2 only b. 1 and 3 only c. 2 only d. 3 only e. 2 and 3 only

c. 2 only

A 20 N block is being pushed across a horizontal table by an 18 N force. If the coefficient of kinetic friction between the block and the able is 0.4, find the acceleration of the block. a. 0.5 m/s/s b. 1 m/s/s c. 5 m/s/s d. 7.5 m/s/s e. 9 m/s/s

c. 5 m/s/s

If a 54-N*s impulse is given to a 6.0 kg object, the change of momentum for the object is a. 6 kg*m/s b. 9 kg*m/s c. 54 kg*m/s d. 324 kg*m/s

c. 54 kg*m/s

What does the movement of an electric charge cause? a. The movement of a magnetic charge b. An electron or proton c. A magnetic field

c. A magnetic field

If the position vs. time graph of an object is a horizontal line, the object is a. Moving with a constant non-zero speed. b. Moving with a constant non-zero acceleration. c. At rest d. Moving with infinite speed.

c. At rest

Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater change in momentum? a. The moth b. Your car c. Both the same

c. Both the same

Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater force? a. The moth b. Your car c. Both the same

c. Both the same

Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the greater impulse? a. The moth b. Your car c. Both the same

c. Both the same

If you whirl a tin can on the end of a string and the string suddenly breaks, the can will a. Fly directly away from you b. Fly directly toward you c. Fly off, tangent to its circular path. d. Spiral ways from your hand. e. Spiral in toward your hand.

c. Fly off, tangent to its circular path.

A fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line: at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. This is evidence that: a. He is accelerating. b. He is covering a greater distance in each consecutive second. c. He is moving with a constant speed (on average). d. He is decelerating.

c. He is moving with a constant speed (on average).

A doubling of launch speed (Vx) causes the time to fall to ______ and the DX to ______. a. Double, double b. Halve, double c. Not change, double d. Double, not change

c. Not change, double

Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity _____. a. Decreases b. Increases c. Stays the same

c. Stays the same

Compared to its mass on Earth, the mass of a 10-kg object on the moon is a. Less b. More c. The same

c. The same

A karate expert executes a swift blow and severs a cement block with her bare hand. a. The impulse on the hand is greater than the impulse on the block. b. The force on the hand is greater than the force on the block. c. The time of impact on both the block and the expert's hand is the same. d. All of the above e. None of the above

c. The time of impact on both the block and the expert's hand is the same.

Which of the following is NOT an example of projectile motion? a. a volleyball served over a net b. a baseball hit by a bat c. a hot-air balloon drifting toward Earth d. a long-jumper in action

c. a hot-air balloon drifting toward Earth

When you jump off a step, you usually bend your knees as you reach the ground. By doing this, the time of the impact is about 10 times more what it would be in a stiff-legged landing, and the average force on your body is reduced by ______. a. less than 10 times b. more than 10 times c. about 10 times

c. about 10 times

A Truck driving along the highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is ______. a. zero b. half of the original c. doubled d. unchanged

c. doubled

A baseball is thrown straight upward. What is the ball's acceleration at its highest point? a. 0 b. 1/2 g, downward c. g, downward d. 1/2 g, downward e. g, upward

c. g, downward

An airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind, then ground speed is _______. a. less b. unchanged c. more

c. more

A Ping-Pong ball launcher is fired. Compared to the force on the ball, the force on the launcher is a. larger b. smaller c. the same

c. the same

A ball is hurled into the air at an angle of 30 degrees above the horizontal and lands on a target that is at the same level as that where the ball started. Th ball will also land on the target if it is thrown at an angle of _____. a. 40 degrees b. 45 degrees c. 55 degrees d. 60 degrees

d. 60 degrees

A string attached to an airborne kite was maintained at an angle of 40 degrees with the ground. If 120 m of string was reeled in to return the kite back to the ground, what was the horizontal displacement of the kite? (Assume the string did not sag). a. 110 m b. 84 m c. 77 m d. 92 m

d. 92 m

A ball thrown in the air will never go as far as physics ideally would predict because _______. a. One can never throw the ball fast enough. b. Gravity is acting. c. Ideally the ball would never land. d. Air friction slows the ball.

d. Air friction slows the ball.

Friction a. Acts in a direction that opposes the motion of an object b. Comes from microscopic bumps act as obstructions to the object's motion c. Is the name given to the force acting between surfaces sliding past one another d. All of the above

d. All of the above

The north pole of a compass if attracted to a. Earth's geographical north b. Earth's geographical south c. Earth's magnetic north d. Earth's magnetic south

d. Earth's magnetic south

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ... a. The plastic strip acquired extra protons from the cotton. b. The plastic strip acquired extra protons during the charging process. c. Protons were created as the result of the charging process. d. The plastic strip lost electrons to cotton during the charging process.

d. The plastic strip lost electrons to cotton during the charging process.

Astronauts on the orbiting space station are weightless because... a. There is no gravity in space and they do not weigh anything. b. Space is a vacuum and there is no gravity in a vacuum. c. Space is a vacuum and there is no air resistance in a vacuum. d. They are actually falling towards earth.

d. They are actually falling towards earth.

The slope of a position-time graph represents: a. Displacement b. Distance c. Acceleration d. Velocity

d. Velocity

A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when 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

Equilibrium occurs when a. All the forces acting on an object are balanced. b. The sum of the +x forces on an object equals the sum of the -x forces. c. The sum of the upward forces equals the sum of the downward forces. d. The net force on the object is zero. e. All of the above

e. All of the above

The law of inertia states that an object a. at rest will remain at rest unless acted on by an outside force. b. will continue moving at the same velocity unless an outside force acts on it. c. will continue moving in a straight line unless an outside force acts on it. d. that is not moving will never move unless a force acts on it. e. All of the above

e. All of the above

Conservation of charge means that a. The total amount of charge in the universe is constant. b. Charge can be neither created nor destroyed. c. Electrons by themselves can be neither created nor destroyed. d. No experimenter has ever seen charge destroyed by itself. e. All of the above.

e. All of the above.

In order to increase the final momentum of a golf ball, we could ______. a. Increase the force acting on it. b. Increase the time of contact with the ball. c. Follow through when hitting the ball. d. Swing as hard as possible. e. All of the above.

e. All of the above.

The gravitational force between between two masses a. Is always an attraction. b. Depends on how large the masses are. c. Depends inversely on the square of the distance between the masses. d. Depends on a universal gravitational constant. e. All of the above.

e. All of the above.

______ are the charged parts of an atom. a. Only electrons b. Only protons c. Neutrons d. Electrons and Neutrons e. Electrons and Protons f. Protons and Neutrons

e. Electrons and Protons

If all of the forces acting on an object balance so that the net force is zero, then a. The object must be at rest b. The object's speed will decrease c. The object will follow a parabolic trajectory d. The object's direction of motion can change, but not its speed e. None of the above will occur

e. None of the above will occur

If the current on a particular day was flowing with two times the velocity, then the time to cross the river would be ______. a. Two times greater b. One-half as great c. Greater, but not two times greater d. Less, but not on-half the original time. e. The same as it was before

e. The same as it was before

After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals a. Twice the force with which it was fired b. The same amount of force with which it was fired. c. One half the force with which it was fired d. One quarter the forcer with which it was fired. e. Zero, since no force is necessary to keep it moving.

e. Zero, since no force is necessary to keep it moving.

A collision is considered elastic if _______. a. there is no sound generated during the collision. b. there is no lasting deformation. c. the objects that collide don't get hot. d. after the collision, the objects have the same shape as before the collision. e. all of the above

e. all of the above

A current-carrying wire produces a magnetic effect (deflects a compass needle) in the region around the wire. That magnetic effect is called __________.

electromagnetism

Electrons move along a wire from the _________ end of the battery to the _________ end of the battery.

negative, postive

The _______ pole of one magnet attracts the south pole of a second magnet, while the ________ of one magnet repels the other magnet's north pole.

north, north