Question 1

In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you.

Accepted Answer

A) True 
 B)False  False

Question 2

A block is on a frictionless table, on earth. The block accelerates at 5.3 m/ $s ^ { 2 }$ when a $10 \mathrm {~N}$ horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/ $s ^ { 2 }$ . A horizontal force of 5 N is now applied to the block when it is on the Moon. The acceleration imparted to the block by this force is closest to

Accepted Answer

A)  2.7 m/ $s ^ { 2 }$ . 
B)  2.4 m/ $s ^ { 2 }$ . 
C)  2.9 m/ $s ^ { 2 }$ . 
D)  3.2 m/ $s ^ { 2 }$ . 
E)  3.4 m/ $s ^ { 2 }$ . 
A)  2.7 m/ $s ^ { 2 }$ . 
B)  2.4 m/ $s ^ { 2 }$ . 
C)  2.9 m/ $s ^ { 2 }$ . 
D)  3.2 m/ $s ^ { 2 }$ . 
E)  3.4 m/ $s ^ { 2 }$ . A

Question 3

An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?

Accepted Answer

A)  16 N 
B)  61 N 
C)  99 N 
D)  600 N 
E)  440 N 
A)  16 N 
B)  61 N 
C)  99 N 
D)  600 N 
E)  440 N D

Question 4

If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?

Accepted Answer

A)  180 m/s2 
B)  10 m/s2 
C)  160 m/s2 
D)  9.8 m/s2 
E)  32 m/s2 
A)  180 m/s2 
B)  10 m/s2 
C)  160 m/s2 
D)  9.8 m/s2 
E)  32 m/s2

Question 5

In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.67 × 10-27 kg. What is the force on the proton?

Accepted Answer

Question 6

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,

Accepted Answer

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

Question 7

A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?

Accepted Answer

A)  4.91 m/s2 
B)  9.81 m/s2 
C)  46.9 m/s2 
D)  0.206 m/s2 
E)  0.422 m/s2 
A)  4.91 m/s2 
B)  9.81 m/s2 
C)  46.9 m/s2 
D)  0.206 m/s2 
E)  0.422 m/s2

Question 8

A horse pulls a cart with force $\overrightarrow { \mathbf { F } }$ . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

Accepted Answer

A)  is zero newtons. 
B)  equal to the magnitude of $\overrightarrow { \mathbf { F } }$ . 
C)  less than the magnitude of $\overrightarrow { \mathbf { F } }$ . 
D)  greater than the magnitude of $\overrightarrow { \mathbf { F } }$ . 
E)  cannot be determined without knowing the mass of the horse. 
A)  is zero newtons. 
B)  equal to the magnitude of $\overrightarrow { \mathbf { F } }$ . 
C)  less than the magnitude of $\overrightarrow { \mathbf { F } }$ . 
D)  greater than the magnitude of $\overrightarrow { \mathbf { F } }$ . 
E)  cannot be determined without knowing the mass of the horse.

Question 9

A satellite is in orbit around the earth. Which one feels the greater force?

Accepted Answer

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

Question 10

The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force $\overrightarrow { \mathbf { F } }$ either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is

Accepted Answer

A)  zero newtons in either case. 
B)  larger if $\overrightarrow { \mathbf { F } }$ is applied toward the right. 
C)  larger if $\overrightarrow { \mathbf { F } }$ is applied toward the left. 
D)  the same in either case. 
A)  zero newtons in either case. 
B)  larger if $\overrightarrow { \mathbf { F } }$ is applied toward the right. 
C)  larger if $\overrightarrow { \mathbf { F } }$ is applied toward the left. 
D)  the same in either case.

Question 11

When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)

Accepted Answer

A)  The elevator is accelerating upward at a constant rate. 
B)  The elevator is accelerating downward at a constant rate. 
C)  The elevator is moving upward at a constant rate. 
D)  From the given information, we cannot tell if the elevator is moving up or down. 
A)  The elevator is accelerating upward at a constant rate. 
B)  The elevator is accelerating downward at a constant rate. 
C)  The elevator is moving upward at a constant rate. 
D)  From the given information, we cannot tell if the elevator is moving up or down.

Question 12

An object of mass m rests on a flat table. The earth pulls on this object with a force of magnitude mg. What is the reaction force to this pull?

Accepted Answer

A)  The table pushing up on the object with force mg. 
B)  The object pushing down on the table with force mg. 
C)  The table pushing down on the floor with force mg. 
D)  The object pulling upward on the Earth with force mg. 
E)  The table pulling upward on the Earth with force mg. 
A)  The table pushing up on the object with force mg. 
B)  The object pushing down on the table with force mg. 
C)  The table pushing down on the floor with force mg. 
D)  The object pulling upward on the Earth with force mg. 
E)  The table pulling upward on the Earth with force mg.

Question 13

On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

Accepted Answer

A)  2.5 m/s2 
B)  2.0 m/s2 
C)  1.5 m/s2 
D)  1.0 m/s2 
A)  2.5 m/s2 
B)  2.0 m/s2 
C)  1.5 m/s2 
D)  1.0 m/s2

Question 14

Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions must be true about the tension T in the wire?

Accepted Answer

A)  T sin θ = W 
B)  T cos θ = W 
C)  T tan θ = W 
D)  T = W 
E)  T = ma 
A)  T sin θ = W 
B)  T cos θ = W 
C)  T tan θ = W 
D)  T = W 
E)  T = ma

Question 15

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?

Accepted Answer

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

Question 16

In order to get an object moving, you must push harder on it than it pushes back on you.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A)  down the ramp. 
B)  up the ramp. 
C)  perpendicular to the ramp. 
D)  vertically downward. 
E)  None of the above choices is correct. 
A)  down the ramp. 
B)  up the ramp. 
C)  perpendicular to the ramp. 
D)  vertically downward. 
E)  None of the above choices is correct.

Question 18

A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

Accepted Answer

A)  690 N 
B)  550 N 
C)  410 N 
D)  340 N 
A)  690 N 
B)  550 N 
C)  410 N 
D)  340 N

Question 19

A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward.

Accepted Answer

A)  True 
B)  False 
C)  The answer depends on whether the golfer followed through with the swing. 
A)  True 
B)  False 
C)  The answer depends on whether the golfer followed through with the swing.

Question 20

An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be

Accepted Answer

A)  greater than the weight of the elevator. 
B)  less than than the weight of the elevator. 
C)  equal to the weight of the elevator. 
A)  greater than the weight of the elevator. 
B)  less than than the weight of the elevator. 
C)  equal to the weight of the elevator.

Exam 4: Forces and Newtons Laws of Motion

In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you.

An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?

If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?

In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.67 × 10-27 kg. What is the force on the proton?

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,

A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?

A horse pulls a cart with force F→\overrightarrow { \mathbf { F } }F . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

A satellite is in orbit around the earth. Which one feels the greater force?

The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force F→\overrightarrow { \mathbf { F } }F either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is

When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)

An object of mass m rests on a flat table. The earth pulls on this object with a force of magnitude mg. What is the reaction force to this pull?

On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?

Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions must be true about the tension T in the wire?

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?

In order to get an object moving, you must push harder on it than it pushes back on you.

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

A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?

A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward.

An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be

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An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s². How much does she weigh on Earth?

If a net force accelerates a 4.5-kg tool at 40 m/s², what acceleration would that same net force give to an 18-kg tool?

In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 10¹³ m/s². The mass of a proton is 1.67 × 10^-27 kg. What is the force on the proton?

A horse pulls a cart with force $\overrightarrow { \mathbf { F } }$ . As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse

On its own, a tow truck has a maximum acceleration of 3.0 m/s². What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?