AP Physics Concept Questions

A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If g m is the acceleration due to gravity at the surface of Mars, what is the acceleration due to gravity at the location of the satellite? 0 g m/3 g m g m/16 g m/9

0 g m/3 g m g m/16 g m/9

A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled? 0 N200 N120 N160 N150 N

0 N200 N120 N160 N150 N

A push of magnitude PP acts on a box of weight WW as shown in the figure. The push is directed at an angle θθ below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The friction force on the box due to the floor is equal to 00Psin(θ)Psin⁡(θ)Pcos(θ)Pcos⁡(θ)Pcos(θ)+WPcos⁡(θ)+WP+W

00Psin(θ)Psin⁡(θ)Pcos(θ)Pcos⁡(θ)Pcos(θ)+WPcos⁡(θ)+WP+WP+W

If Earth had twice its present mass but it orbited at the same distance from the sun as it does now, its orbital period would be 1 year. 3 years. 4 years. 6 months. 2 years.

1 year. 3 years. 4 years. 6 months. 2 years.

A force produces power PP by doing work WW in a time TT. What power will be produced by a force that does six times as much work in half as much time? 1/12 P 6P P 12P 1/6P

1/12 P 6P P 12P 1/6P

Which of the following quantities has units of a velocity? (There could be more than one correct choice.) 186,000 mi -120 m/s 40 km southwest 9.8 m/s downward 9.8 m/s2 downward

186,000 mi -120 m/s 40 km southwest 9.8 m/s downward 9.8 m/s2 downward

A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is 24000 N.12000 N.1500 N.6000 N.We need to know if the car is accelerating to answer this question.

24000 N. 12000 N. 1500 N. 6000 N. We need to know if the car is accelerating to answer this question.

If a vector A⃗ A→ has components Ax>0Ax>0, and Ay<0Ay<0, then the angle that this vector makes with the positive xx-axis must be in the range 270∘∘ to 360∘∘180∘∘ to 270∘∘0∘∘ to 90∘∘90∘∘ to 180∘∘It cannot be determined without additional information.

270∘∘ to 360∘ ∘180∘∘ to 270∘ ∘0∘∘ to 90∘ ∘90∘∘ to 180∘ ∘It cannot be determined without additional information.

If a vector A⃗ A→ has components Ax<0Ax<0, and Ay>0Ay>0, then the angle that this vector makes with the positive xx-axis must be in the range 270∘∘ to 360∘∘90∘∘ to 180∘∘0∘∘ to 90∘∘180∘∘ to 270∘∘It cannot be determined without additional information.

270∘∘ to 360∘ ∘90∘∘ to 180∘ ∘0∘∘ to 90∘ ∘180∘∘ to 270∘ ∘It cannot be determined without additional information.

When you drop a pebble from height HH, it reaches the ground with kinetic energy KK if there is no air resistance. From what height should you drop it so it will reach the ground with twice as much kinetic energy? 2H 8H 16H √2H 4H

2H 8H 16H √2H 4H

At what angle to the ground should you kick the ball for the maximum "hang time" - that is, the maximum time in the air? 30∘∘45∘∘60∘∘90∘∘

30∘∘45∘∘60∘∘90∘∘

If you kick a football, at what angle to the ground should you kick the ball for the maximum range - that is, the greatest distance down the field? 30∘∘45∘∘60∘∘90∘∘

30∘∘45∘∘60∘∘90∘∘

A tiger is running in a straight line. If we double both the mass and speed of the tiger, the magnitude of its momentum will increase by what factor? 4 16 2 8 √2

4 16 2 8 √2

A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket? 49 N 2.0 N 0.00 N 5.0 N 10 N

49 N 2.0 N 0.00 N 5.0 N 10 N

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground? 4T T T/2 2T T/4

4T T T/2 2T T/4

When you throw a pebble straight up with initial speed VV, it reaches a maximum height HH with no air resistance. At what speed should you throw it up vertically so it will go twice as high? 4V √2V 2V 8V 16V

4V √2V 2V 8V 16V

Which requires more work, increasing a car's speed from 0 mph to 30 mph or from 50 mph to 60 mph? 50 mph to 60 mph0 mph to 30 mphIt is the same in both cases.

50 mph to 60 mph 0 mph to 30 mph It is the same in both cases.

A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is 750 N.75 N.7.5 N.any horizontal force greater than zero.

750 N .75 N. 7.5 N. any horizontal force greater than zero.

An object is moving with constant non-zero velocity. Which of the following statements about it must be true? A constant force is being applied to it in the direction opposite of motion.The net force on the object is zero.A constant force is being applied to it in the direction of motion.A constant force is being applied to it perpendicular to the direction of motion.Its acceleration is in the same direction as it velocity.

A constant force is being applied to it in the direction opposite of motion. The net force on the object is zero. A constant force is being applied to it in the direction of motion. A constant force is being applied to it perpendicular to the direction of motion. Its acceleration is in the same direction as it velocity.

Which of the following situations is impossible? An object has velocity directed east and acceleration directed west. An object has constant non-zero acceleration and changing velocity. An object has velocity directed east and acceleration directed east. An object has constant non-zero velocity and changing acceleration. An object has zero velocity but non-zero acceleration.

An object has velocity directed east and acceleration directed west. An object has constant non-zero acceleration and changing velocity. An object has velocity directed east and acceleration directed east. An object has constant non-zero velocity and changing acceleration. An object has zero velocity but non-zero acceleration.

Which of the quantities are zero throughout the flight?

Ax

The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth? Both mass and weight are less.Mass is less, weight is the same.Mass is the same, weight is less.Both mass and weight are the same.

Both mass and weight are less. Mass is less, weight is the same. Mass is the same, weight is less. Both mass and weight are the same.

A heavy rock and a light rock are dropped from the same height and experience no significant air resistance as they fall. Which of the following statements about these rocks are correct? (There could be more than one correct choice.) Check all that apply. Both rocks have the same kinetic energy when they reach the ground.The heavier rock reaches the ground before the lighter rock.Just as they were released, both rocks had the same amount of gravitational potential energy.Both rocks have the same speed when they reach the ground.When they reach the ground, the heavier rock has more kinetic energy than the lighter rock.

Both rocks have the same kinetic energy when they reach the ground. The heavier rock reaches the ground before the lighter rock. Just as they were released, both rocks had the same amount of gravitational potential energy. Both rocks have the same speed when they reach the ground. When they reach the ground, the heavier rock has more kinetic energy than the lighter rock.

Consider two vectors A⃗ A→ and B⃗ B→ shown in the figure. The difference B⃗ −A⃗ B→−A→ is best illustrated by

Choice (b.)\ V

Consider two vectors A⃗ A→ and B⃗ B→ shown in the figure. The difference A⃗ −B⃗ A→−B→ is best illustrated by choice (a)choice (b)choice (c)choice (d)

Choice (c)^ \

Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just as the snowballs reach the ground below? (There could be more than one correct choice.) Debra's snowball will have a higher speed than Mary's snowball.Mary's snowball will have a higher speed than Debra's snowball.Mary's snowball reaches the ground before Debra's snowball.Both snowballs will hit the ground with the same speed.Both snowballs hit the ground at the same time.

Debra's snowball will have a higher speed than Mary's snowball. Mary's snowball will have a higher speed than Debra's snowball. Mary's snowball reaches the ground before Debra's snowball. Both snowballs will hit the ground with the same speed. Both snowballs hit the ground at the same time.

A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true? During the collision, the force on the truck is equal to the force on the car.The car did not slow down during the collision, but the truck did.During the collision, the force on the truck is greater than the force on the car.The truck did not slow down during the collision, but the car did.During the collision, the force on the truck is smaller than the force on the car.

During the collision, the force on the truck is equal to the force on the car. The car did not slow down during the collision, but the truck did. During the collision, the force on the truck is greater than the force on the car. The truck did not slow down during the collision, but the car did. During the collision, the force on the truck is smaller than the force on the car.

In the figure, a 10-lb weight is suspended from two spring scales, each of which has negligible weight. Which one of the following statements about the readings in the scales is true? Each scale will show a reading between one and 10 lb, such that the sum of the two is 10 lb. However, exact readings cannot be determined without more information.The top scale will read zero, the lower scale will read 10 lb.The lower scale will read zero, the top scale will read 10 lb.Each scale will read 5 lb.None of these is true.

Each scale will show a reading between one and 10 lb, such that the sum of the two is 10 lb. However, exact readings cannot be determined without more information. The top scale will read zero, the lower scale will read 10 lb. The lower scale will read zero, the top scale will read 10 lb. Each scale will read 5 lb. None of these is true.

Two small objects, with masses m and M, are originally a distance r apart, and the gravitational force on each one has magnitude F. The second object has its mass changed to 2M, and the distance is changed to r/4. What is the magnitude of the new gravitational force? F/16 2F 16F F/32 32F

F/16 2F 16F F/32 32F

Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r. What is the magnitude of the new gravitational force? F/4 16F 4F F/16 F/2

F/4 16F 4F F/16 F/2

The graphs shown show the magnitude F of the force exerted by a spring as a function of the distance x the spring has been stretched. Which graph would represent the correct relationship between Force applied and distance stretched?

Graph b / / /

A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance? It is impossible to tell because we do not know their masses .the stone the ball Both are traveling at the same speed.

It is impossible to tell because we do not know their masses. the stone the ball Both are traveling at the same speed.

Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct? It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier.It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier.It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter.It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter.The two objects reach the bottom of the ramp at exactly the same time.

It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier. It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier. It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter. It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter. The two objects reach the bottom of the ramp at exactly the same time.

A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.) Its acceleration is constantly decreasing. Its acceleration is constant. Its acceleration is constantly increasing. Its acceleration is greater than g. Its acceleration is zero.

Its acceleration is constantly decreasing. Its acceleration is constant. Its acceleration is constantly increasing. Its acceleration is greater than g. Its acceleration is zero.

Suppose that a car traveling to the east (+x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct? Its acceleration is in the +x direction. Its acceleration is in the -x direction. Its acceleration is decreasing in magnitude as the car slows down. Its acceleration is zero.

Its acceleration is in the +x direction. Its acceleration is in the -x direction. Its acceleration is decreasing in magnitude as the car slows down. Its acceleration is zero.

A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down. Which of the following statements about the rock's motion are true just before it hits the ground? (There could be more than one correct choice.) Its velocity is vertical. Its vertical velocity component is the same as it was just as it was launched. Its horizontal velocity component is zero. Its horizontal velocity component is the same as it was just as it was launched. Its speed is the same as it was just as it was launched.

Its velocity is vertical. Its vertical velocity component is the same as it was just as it was launched. Its horizontal velocity component is zero. Its horizontal velocity component is the same as it was just as it was launched .Its speed is the same as it was just as it was launched.

Two children, Ahmed and Jacques, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Jacques. Which of the following are true statements? (There could be more than one correct choice.) Check all that apply. Jacques has a smaller angular speed than Ahmed. Jacques and Ahmed have the same tangential speed. Jacques has a greater angular speed than Ahmed. Ahmed has a greater tangential speed than Jacques. Jacques and Ahmed have the same angular speed.

Jacques has a smaller angular speed than Ahmed. Jacques and Ahmed have the same tangential speed. Jacques has a greater angular speed than Ahmed. Ahmed has a greater tangential speed than Jacques. Jacques and Ahmed have the same angular speed.

Two men, Joel and Jerry, push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do on the car. Joel does 50% more work than Jerry.Joel does 25% more work than Jerry.Jerry does 50% more work than Joel.Joel does 75% more work than Jerry.Neither of them does any work.

Joel does 50% more work than Jerry. Joel does 25% more work than Jerry. Jerry does 50% more work than Joel. Joel does 75% more work than Jerry. Neither of them does any work.

A truck has four times the mass of a car and is moving with twice the speed of the car. If KtKt and KcKc refer to the kinetic energies of truck and car respectively, it is correct to say that KtKt = 4Kc4Kc.KtKt = 12Kc12Kc.KtKt = 16Kc16Kc.KtKt = 2Kc2Kc.KtKt = KcKc.

Kt=16Kc

A very light ping-pong ball moving east at a speed of 4 m/s collides with a very heavy stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision? Neither; both experienced the same magnitude impulse.the Ping-Pong ballthe bowling ballIt is impossible to tell since the actual mass values are not given.It is impossible to tell since the velocities after the collision are unknown.

Neither; both experienced the same magnitude impulse. the Ping-Pong ball the bowling ball It is impossible to tell since the actual mass values are not given. It is impossible to tell since the velocities after the collision are unknown.

A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct? On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. The acceleration is downward at all points in the motion except that is zero at the highest point. Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration. The acceleration is downward at all points in the motion. On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero.

On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. The acceleration is downward at all points in the motion except that is zero at the highest point. Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration. The acceleration is downward at all points in the motion. On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero.

As shown in the figure, a woman is straining to lift a large crate, but without success because it is too heavy. We denote the forces on the crate as follows: P is the magnitude of the upward force being exerted on the crate by the person, C is the magnitude of the vertical contact force on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the person is trying unsuccessfully to lift the crate? P + C > WP + C = WP + C < WP = C

P + C > WP + C = WP + C < WP = C

A person stands on the edge of a cliff. She throws three identical rocks with the same speed. Rock X is thrown vertically upward, rock Y is thrown horizontally, and rock Z is thrown vertically downward. If the ground at the base of the cliff is level, which rock hits the ground with the greatest speed if there is no air resistance? Rock XRock YRock ZThey all hit the ground with the same speed.

Rock X Rock Y Rock Z They all hit the ground with the same speed.

Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings), initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start moving away from Bill. Just after Bill stops pushing, Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill.Susan is moving away from Bill, and Bill is stationary.Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill.Susan and Bill are moving away from each other, with equal speeds.

Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill. Susan is moving away from Bill, and Bill is stationary. Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill. Susan and Bill are moving away from each other, with equal speeds.

Two boxes are connected to each other by a string as shown in the figure. The 10-N box slides without friction on the horizontal table surface. The pulley is ideal and the string has negligible mass. What is true about the tension T in the string? T < 30 NT = 20 NT > 30 NT = 10 NT = 30 N

T < 30 N T = 20 N T > 30 N T = 10 N T = 30 N

Under what condition is average velocity equal to the average of the object's initial and final velocity? The acceleration must be constantly increasing. This can only occur if there is no acceleration. This can occur only when the velocity is zero. The acceleration is constant. The acceleration must be constantly decreasing.

The acceleration must be constantly increasing. This can only occur if there is no acceleration. This can occur only when the velocity is zero. The acceleration is constant. The acceleration must be constantly decreasing.

Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.) The acceleration of the object is +g when the object is rising and -g when it is falling.The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.The speed of the object is zero at its highest point.The speed of the object is constant but its velocity is not constant.The acceleration of the object is zero at its highest point.

The acceleration of the object is +g when the object is rising and -g when it is falling. The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward. The speed of the object is zero at its highest point. The speed of the object is constant but its velocity is not constant. The acceleration of the object is zero at its highest point.

Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object. The displacement is always equal to the distance traveled. The displacement is either less than or equal to the distance traveled. The displacement is either greater than or equal to the distance traveled. The displacement can be either greater than, smaller than, or equal to the distance traveled.

The displacement is always equal to the distance traveled. The displacement is either less than or equal to the distance traveled. The displacement is either greater than or equal to the distance traveled. The displacement can be either greater than, smaller than, or equal to the distance traveled.

A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When the force on his hands equals his weight, what happens to the fireman? The fireman descends with slower and slower speed.The fireman descends with a smaller but non-zero acceleration.The acceleration of the fireman is now upward.The fireman continues to descend, but with constant speed.The fireman comes to a stop.

The fireman descends with slower and slower speed. The fireman descends with a smaller but non-zero acceleration. The acceleration of the fireman is now upward. The fireman continues to descend, but with constant speed. The fireman comes to a stop.

Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce back from the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greater impact force on your car? The force would be the same in both cases.hitting the other carhitting the brick wallNone of the above choices are correct.

The force would be the same in both cases. hitting the other car hitting the brick wall None of the above choices are correct.

A 5-kg ball collides inelastically head-on with a 10-kg ball, which is initially stationary. Which of the following statements is true? (There could be more than one correct choice.) Check all that apply. The magnitude of the change of velocity the 5-kg ball experiences is greater than that of the 10-kg ball.The magnitude of the change of velocity the 5-kg ball experiences is equal to that of the 10-kg ball.Both balls lose all their momentum since the collision is inelastic.The magnitude of the change of the momentum of the 5-kg ball is equal to the magnitude of the change of momentum of the 10-kg ball.The magnitude of the change of velocity the 5-kg ball experiences is less than that of the 10-kg ball.

The magnitude of the change of velocity the 5-kg ball experiences is greater than that of the 10-kg ball. The magnitude of the change of velocity the 5-kg ball experiences is equal to that of the 10-kg ball. Both balls lose all their momentum since the collision is inelastic. The magnitude of the change of the momentum of the 5-kg ball is equal to the magnitude of the change of momentum of the 10-kg ball. The magnitude of the change of velocity the 5-kg ball experiences is less than that of the 10-kg ball.

Satellite A has twice the mass of satellite B, and moves at the same orbital distance from Earth as satellite B. Compare the speeds of the two satellites. The speed of B is equal to the speed of A. The speed of B is twice the speed of A. The speed of B is one-fourth the speed of A. The speed of B is one-half the speed of A. The speed of B is four times the speed of A.

The speed of B is equal to the speed of A. The speed of B is twice the speed of A. The speed of B is one-fourth the speed of A. The speed of B is one-half the speed of A. The speed of B is four times the speed of A.

The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at time t = 0.At time T, what is true of the distances traveled by the vehicles since time t = 0? The truck will not have moved. They will have traveled the same distance. The car will have travelled further than the truck. The truck will have travelled further than the car.

The truck will not have moved. They will have traveled the same distance. The car will have travelled further than the truck. The truck will have travelled further than the car.

For a projectile, which of the following quantities are constant during the flight: xx, yy, vxvx, vyvy, vv, axax, ayay?

Vx Ax Ay

A push of magnitude PP acts on a box of weight WW as shown in the figure. The push is directed at an angle θθ below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to WW.W+Pcos(θ)W+Pcos⁡(θ) .W−Psin(θ)W−Psin⁡(θ) .W+Psin(θ)W+Psin⁡(θ).W+PW+P.

WW.W+Pcos(θ)W+Pcos⁡(θ) .W−Psin(θ)W−Psin⁡(θ) .W+Psin(θ)W+Psin⁡(θ).W+PW+P.

Two objects of unequal masses, M and m (M > m), are connected by a very light cord passing over an ideal pulley of negligible mass. When released, the system accelerates, and friction is negligible.Which one of the following free-body diagrams most realistically represents the forces acting on the two objects in the moving system?

^ | ^ | | M m | v | | v

An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is a horizontal straight line. a vertical straight line .a straight line making an angle with the time axis .a parabolic curve.

a horizontal straight line. a vertical straight line .a straight line making an angle with the time axis .a parabolic curve.

An object is moving with constant non-zero velocity in the +x direction. The position versus time graph of this object is a horizontal straight line. a vertical straight line. a straight line making an angle with the time axis. a parabolic curve.

a horizontal straight line. a vertical straight line. a straight line making an angle with the time axis. a parabolic curve.

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock? a/2 a a/4 4a 2a

a/2 a a/4 4a 2a

The slope of a velocity versus time graph gives acceleration.velocity.the distance traveled.displacement. acceleration. velocity. the distance traveled. displacement.

acceleration. velocity. the distance traveled. displacement.

If you pound a feather with a hammer, which one feels a greater force? always the hammerIf the feather moves, then it felt the greater force. Otherwise the force was the same on both.always the featherThe size of the force is always exactly the same on both of them.

always the hammerIf the feather moves, then it felt the greater force. Otherwise the force was the same on both. always the feather The size of the force is always exactly the same on both of them.

A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will be directly over the package.be in front of the package.be behind the package.depend on the speed of the plane when the package was released.

be directly over the package. be in front of the package. be behind the package. depend on the speed of the plane when the package was released.

In the figure, what does the spring scale read? The pulleys are ideal and the strings and scale are also massless. exactly 2.0 Nmore than 19.6 N0.00 N0.50 Nexactly 1.0 N

exactly 2.0 N more than 19.6 N 0.00 N 0.50 N exactly 1.0 N

A block of mass mm sits at rest on a rough inclined ramp that makes an angle θθ with the horizontal. What must be true about force of static friction ff on the block? ff > mgcos(θ)mgcos⁡(θ)ff = mgsin(θ)mgsin⁡(θ)ff = mgcos(θ)mgcos⁡(θ)ff > mgmgff > mgsin(θ)mgsin⁡(θ)

ff > mgcos(θ)mgcos⁡(θ)ff = mgsin(θ)mgsin⁡(θ)ff = mgcos(θ)mgcos⁡(θ)ff > mgmgff > mgsin(θ)mgsin⁡(θ)

A 5-kg ball collides inelastically head-on with a 10-kg ball, which is initially stationary. Which of the following statements is true? (There could be more than one correct choice.) gravity the friction force from the road the normal force from the road No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.

gravity the friction force from the road the normal force from the road No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v0 and experience no significant air resistance. If the 10-kg rock reaches a maximum height h, what maximum height will the 20-kg ball reach? h/4 4h h/2 h 2h

h/4 4h h/2 h 2h

You are trying to cross a river that flows toward the south with a strong current. You start out in your motorboat on the east bank desiring to reach the west bank directly west from your starting point. You should head your motorboat in a general southwesterly direction. directly toward the west. directly toward the north .in a general northwesterly direction.

in a general southwesterly direction. directly toward the west. directly toward the north .in a general northwesterly direction.

The momentum of an isolated system is conserved in both elastic and inelastic collisions.only in inelastic collisions.only in elastic collisions. in both elastic and inelastic collisions. only in inelastic collisions. only in elastic collisions.

in both elastic and inelastic collisions. only in inelastic collisions. only in elastic collisions.

Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. If these two vectors are added together, the magnitude of the sum is equal to 2.0 m.could be as small as 2.0 m or as large as 12 m.is equal to 12 m.is equal to 8.6 m

is equal to 2.0 m. could be as small as 2.0 m or as large as 12 m. is equal to 12 m. is equal to 8.6 m.

Which of the following quantities are units of momentum? (There could be more than one correct choice.) Check all that apply. kg • m/sN • mFowlers (if you don't pick this one you get coal in your stocking)N • skg ∙ m2/s2

kg • m/s N • m Fowlers (if you don't pick this one you get coal in your stocking) N • s kg ∙ m2/s2

If the units of your answer are kg • m2/s3, which of the following types of quantities could your answer be? (There could be more than one correct choice.) kinetic energyforcepotential energyworkpower

kinetic energy force potential energy work power

A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read? less than 700 N700 Nmore than 700 NIt could be more or less than 700 N, depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.

less than 700 N 700 N more than 700 N It could be more or less than 700 N, depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.

In an inelastic collision involving an isolated system, the final total momentum is more than the initial momentum.exactly the same as the initial momentum.less than the initial momentum.

more than the initial momentum. exactly the same as the initial momentum. less than the initial momentum.

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it moves along a straight-line path away from the center of the circle. continues to follow a circular path, but with a radius larger than the original radius. moves along a straight-line path toward the center of the circle. moves along a path that is neither straight nor circular. moves along a straight-line path in its original direction.

moves along a straight-line path away from the center of the circle. continues to follow a circular path, but with a radius larger than the original radius. moves along a straight-line path toward the center of the circle. moves along a path that is neither straight nor circular. moves along a straight-line path in its original direction.

Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake. The person in the front throws a very massive ball toward the back, and the person in the back catches it. After the ball is caught, the canoe is moving forward.moving backward.stationary.

moving forward. moving backward stationary.

If the position versus time graph of an object is a horizontal line, the object is moving with constant non-zero speed. moving with constant non-zero acceleration. at rest. moving with increasing speed.

moving with constant non-zero speed. moving with constant non-zero acceleration .at rest. moving with increasing speed.

If the velocity versus time graph of an object is a horizontal line, the object is moving with zero acceleration. moving with constant non-zero acceleration. at rest. moving with increasing speed.

moving with zero acceleration. moving with constant non-zero acceleration. at rest. moving with increasing speed.

A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory neither the ball's velocity nor its acceleration are zero. both the velocity and the acceleration of the soccer ball are zero. the ball's acceleration points upward. the ball's velocity points downward. the ball's acceleration is zero but its velocity is not zero.

neither the ball's velocity nor its acceleration are zero. both the velocity and the acceleration of the soccer ball are zero. the ball's acceleration points upward. the ball's velocity points downward. the ball's acceleration is zero but its velocity is not zero.

A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is one-half as much.one-fourth as much.twice as much.four times as much.the same.

one-half as much. one-fourth as much. twice as much. four times as much. the same.

When is the average velocity of an object equal to the instantaneous velocity? only when the velocity is increasing at a constant ratealways when the velocity is constant never only when the velocity is decreasing at a constant rate

only when the velocity is increasing at a constant ratealways when the velocity is constant never only when the velocity is decreasing at a constant rate

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point perpendicular to the ramp.vertically downward.up the ramp.down the ramp.None of the above choices is correct.

perpendicular to the ramp. vertically downward .up the ramp. down the ramp. None of the above choices is correct.

The area under a curve in a velocity versus time graph gives position. displacement. acceleration. velocity.

position. displacement. acceleration. velocity.

If the force on an object is in the negative direction, the work it does on the object must be positive.negative.The work could be either positive or negative, depending on the direction the object moves.

positive. negative. The work could be either positive or negative, depending on the direction the object moves.

For general projectile motion with no air resistance, the horizontal component of a projectile's acceleration remains a non-zero constant.continuously increases.is always zero.continuously decreases.first decreases and then increases.

remains a non-zero constant. continuously increases. is always zero. continuously decreases. first decreases and then increases.

For general projectile motion with no air resistance, the horizontal component of a projectile's velocity remains a non-zero constant.first decreases and then increases.continuously increases.remains zero.continuously decreases.

remains a non-zero constant. first decreases and then increases. continuously increases. remains zero. continuously decreases.

The motion of a particle is described in the velocity vs. time graph shown in the figure.Over the nine-second interval shown, we can say that the speed of the particle remains constant. decreases and then increases .only increases. increases and then decreases. only decreases.

remains constant. decreases and then increases .only increases. increases and then decreases. only decreases.

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is slowing down and changing direction.speeding up and changing direction.changing direction.speeding up.slowing down.

slowing down and changing direction. speeding up and changing direction. changing direction. speeding up. slowing down.

A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force on the car due to the road? tangent to the curve opposite to the direction of the car's motion tangent to the curve in the forward direction perpendicular to the curve outward perpendicular to the curve inward There is no friction on the car because its speed is constant.

tangent to the curve opposite to the direction of the car's motion tangent to the curve in the forward direction perpendicular to the curve outward perpendicular to the curve inward There is no friction on the car because its speed is constant.

A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the wall. Which one of these objects experiences the greater momentum change? the ballthe clayBoth of them experience the same non-zero momentum change.Both of them experience zero momentum change.

the ball the clay Both of them experience the same non-zero momentum change. Both of them experience zero momentum change.

From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below the blue ball will be moving faster than the green ball. the two balls will have the same speed. the green ball will be moving faster than the blue ball.

the blue ball will be moving faster than the green ball. the two balls will have the same speed. the green ball will be moving faster than the blue ball.

The slope of a position versus time graph gives the distance traveled. velocity. displacement.acceleration.

the distance traveled. velocity. displacement.acceleration.

You are standing in a moving bus, facing forward, when you suddenly slide forward as the bus comes to an immediate stop. What force caused you to slide forward? the normal force due to your contact with the floor of the busgravitythe force due to friction between you and the floor of the busThere is not a force causing you to slide forward.

the normal force due to your contact with the floor of the bus gravity the force due to friction between you and the floor of the bus There is not a force causing you to slide forward.

You push on box G that is next to box H, causing both boxes to slide along the floor, as shown in the figure. The reaction force to your push is the push of box G against you.the upward force of the floor on box G.the push of box H on box G.the acceleration of box G.the push of box G on box H.

the push of box G against you. the upward force of the floor on box G. the push of box H on box G. the acceleration of box G. the push of box G on box H.

Jill does twice as much work as Jack does and in half the time. Jill's power output is the same as Jack's power output.four times Jack's power output.twice Jack's power output.one-fourth as much as Jack's power output.one-half as much as Jack's power output.

the same as Jack's power output. four times Jack's power output. twice Jack's power output. one-fourth as much as Jack's power output. one-half as much as Jack's power output.

A satellite is in orbit around the earth. Which one feels the greater force? the satellite because the earth is so much more massiveIt depends on the distance of the satellite from Earth.the earth because the satellite has so little massEarth and the satellite feel exactly the same force.

the satellite because the earth is so much more massive It depends on the distance of the satellite from Earth. the earth because the satellite has so little mass Earth and the satellite feel exactly the same force.

In a collision between two unequal masses, which mass receives a greater magnitude impulse? the smaller massthe larger massThey receive equal impulses. the smaller mass the larger mass They receive equal impulses.

the smaller mass the larger mass They receive equal impulses.

The reason an astronaut in an earth satellite feels weightless is that this is a psychological effect associated with rapid motion. the astronaut's acceleration is zero. the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel. the astronaut is beyond the range of the earth's gravity. the astronaut is falling.

this is a psychological effect associated with rapid motion. the astronaut's acceleration is zero. the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel. the astronaut is beyond the range of the earth's gravity. the astronaut is falling.

Swimmers at a water park have a choice of two frictionless water slides, as shown in the figure. Although both slides drop over the same height h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. How does the speed v1 of a swimmer reaching the bottom of slide 1 compare with v2, the speed of a swimmer reaching the end of slide 2? v1 > v2v1 < v2v1 = v2The heavier swimmer will have a greater speed than the lighter swimmer, no matter which slide he uses.No simple relationship exists between v1 and v2.

v1 > v2 v1 < v2 v1 = v2 The heavier swimmer will have a greater speed than the lighter swimmer, no matter which slide he uses. No simple relationship exists between v1 and v2.

A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity? when it is closer to the Moon than it is to Earth when it is half-way there when it gets above the atmosphere It is never beyond the pull of Earth's gravity.

when it is closer to the Moon than it is to Earth when it is half-way there when it gets above the atmosphere It is never beyond the pull of Earth's gravity.

Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord. The mass of P is greater than that of Q. A horizontal force F⃗ F→ is applied to box Q as shown in the figure, accelerating the bodies to the right. The magnitude of the force exerted by the connecting cord on body P is zero.less than F but not zero.greater than F.equal to F.

zero. less than F but not zero. greater than F. equal to F.