Question 1

An object is moving forward with a constant velocity. Which statement about this object MUST be true?

Accepted Answer

A)  The net force on the object is zero. 
B)  The net force on the object is in the forward direction. 
C)  No forces are acting on the object. 
D)  The acceleration of the object is in the forward direction. 
A)  The net force on the object is zero. 
B)  The net force on the object is in the forward direction. 
C)  No forces are acting on the object. 
D)  The acceleration of the object is in the forward direction.

Question 2

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is

Accepted Answer

A)  the force of gravity. 
B)  the normal force due to your contact with the floor of the bus. 
C)  the force due to static friction between you and the floor of the bus. 
D)  the force due to kinetic friction between you and the floor of the bus. 
E)  No forces were acting on you to cause you to fall. 
A)  the force of gravity. 
B)  the normal force due to your contact with the floor of the bus. 
C)  the force due to static friction between you and the floor of the bus. 
D)  the force due to kinetic friction between you and the floor of the bus. 
E)  No forces were acting on you to cause you to fall.

Question 3

A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes 15.2 s, how long is the slope? Assume that frictional forces may be neglected.

Accepted Answer

A)  293 m 
B)  586 m 
C)  1130 m 
D)  147 m 
A)  293 m 
B)  586 m 
C)  1130 m 
D)  147 m

Question 4

Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?

Accepted Answer

A)  1.1 m/s2 
B)  1.3 m/s2 
C)  1.5 m/s2 
D)  1.7 m/s2 
A)  1.1 m/s2 
B)  1.3 m/s2 
C)  1.5 m/s2 
D)  1.7 m/s2

Question 5

A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is

Accepted Answer

A)  zero. 
B)  up the hill and equal to the weight of the car. 
C)  down the hill and equal to the weight of the car. 
D)  up the hill and greater than the weight of the car. 
E)  down the hill and greater than the weight of the car. 
A)  zero. 
B)  up the hill and equal to the weight of the car. 
C)  down the hill and equal to the weight of the car. 
D)  up the hill and greater than the weight of the car. 
E)  down the hill and greater than the weight of the car.

Question 6

The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 36 kg. What are the masses of objects 1 and 3?

Accepted Answer

A)  14 kg and 90 kg 
B)  72 kg and 18 kg 
C)  90 kg and 18 kg 
D)  14 kg and 72 kg 
A)  14 kg and 90 kg 
B)  72 kg and 18 kg 
C)  90 kg and 18 kg 
D)  14 kg and 72 kg

Question 7

You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

Accepted Answer

A)  the velocity of the bus is forward. 
B)  the velocity of the bus is backward. 
C)  You cannot conclude anything about the direction of the velocity of the bus. 
A)  the velocity of the bus is forward. 
B)  the velocity of the bus is backward. 
C)  You cannot conclude anything about the direction of the velocity of the bus.

Question 8

Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will

Accepted Answer

A)  start to slow down. 
B)  not slow down or speed up. 
C)  speed up a little, and then slow down. 
D)  speed up a little, and then move at a constant speed. 
A)  start to slow down. 
B)  not slow down or speed up. 
C)  speed up a little, and then slow down. 
D)  speed up a little, and then move at a constant speed.

Question 9

The figure shows two forces acting on an object, with magnitudes   and  
What third force will cause the object to be in equilibrium (acceleration equals zero)?

Accepted Answer

A)  52 N pointing down 
B)  52 N pointing up 
C)  82 N pointing down 
D)  82 N pointing up 
A)  52 N pointing down 
B)  52 N pointing up 
C)  82 N pointing down 
D)  82 N pointing up

Question 10

An object weighing 4.00 N falls from rest subject to a frictional drag force given by Fdrag = bv2, where v is the speed of the object and    What terminal speed will this object approach?

Accepted Answer

A)  1.78 m/s 
B)  3.42 m/s 
C)  1.15 m/s 
D)  2.25 m/s 
E)  0.75 m/s 
A)  1.78 m/s 
B)  3.42 m/s 
C)  1.15 m/s 
D)  2.25 m/s 
E)  0.75 m/s

Question 11

Suppose the force of the air drag on an object is proportional to the speed of the object and in the direction opposite the object's velocity. If you throw an object upward, the magnitude of its acceleration is greatest

Accepted Answer

A)  right after the object is released. 
B)  at the top of its trajectory. 
C)  The acceleration of the object is the same throughout the entire trajectory. 
A)  right after the object is released. 
B)  at the top of its trajectory. 
C)  The acceleration of the object is the same throughout the entire trajectory.

Exam 5: Force and Motion

An object is moving forward with a constant velocity. Which statement about this object MUST be true?

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is

A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes 15.2 s, how long is the slope? Assume that frictional forces may be neglected.

Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?

A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is

The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 36 kg. What are the masses of objects 1 and 3?

You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will

The figure shows two forces acting on an object, with magnitudes and What third force will cause the object to be in equilibrium (acceleration equals zero)?

An object weighing 4.00 N falls from rest subject to a frictional drag force given by Fdrag = bv2, where v is the speed of the object and What terminal speed will this object approach?

Suppose the force of the air drag on an object is proportional to the speed of the object and in the direction opposite the object's velocity. If you throw an object upward, the magnitude of its acceleration is greatest

Concepts of Motion

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Newtons Third Law

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An object weighing 4.00 N falls from rest subject to a frictional drag force given by F_drag = bv², where v is the speed of the object and What terminal speed will this object approach?