AnswersMO-Physical Science A-CRLab: Motion

Newton's Laws of Motion Answers

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Two people push on the same door from opposite sides as shown.

Question illustration
A
both people exert the same force so that the forces are unbalanced.
B
neither person exerts a force on the door so that the net force is zero.
C
one person exerts more force than the other so that the forces are unbalanced.
D
both people exert the same force so that the forces are balanced.
2
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How do Newton’s laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can pass a puck as quickly as possible?

A
Smooth ice reduces the inertia of the hockey puck.
B
Smooth ice increases the force used to accelerate the hockey puck.
C
Smooth ice reduces the unbalanced forces that would slow the hockey puck.
D
Smooth ice decreases the reaction force that the ice exerts on the hockey puck.
3

According to Newton’s second law of motion, what is force equal to?

A
acceleration divided by mass
B
mass times acceleration
C
mass divided by acceleration
D
inertia times acceleration
4

Laura sees a horse pulling a buggy.Which statement best describes the forces acting on the horse and buggy?

A
The net forces exerted on the horse and cart are the same, but the action force is larger.
B
The net forces exerted on the horse and cart are the same, but they are in the same direction.
C
The net forces exerted on the horse and cart are not the same, so the two forces cancel out.
D
The net forces exerted on the horse and cart are not the same, so they are not balanced forces.
5

A bowling ball has a mass of 7.2 kg and a weight of 70.6 N. It moves down the bowling alley at 1 m/s and strikes a pin with a force of 15.0 N. What is the force that the pin exerts on the bowling ball?

A
7.2 N
B
15.0 N
C
70.6 N
D
85.6 N
6

Action and reaction forces are described by which of Newton’s laws of motion?

A
first
B
second
C
third
D
fourth
7

A cart accelerates at 2 m/s2 when a force of 60 N is applied. What is the mass of the cart? (Formula: F=ma)

A
0.03 kg
B
30 kg
C
62 kg
D
120 kg
8

Luis and Aisha conducted an experiment. They exerted different forces on four objects. Their results are shown in the table.Based on the data, which object has the greatest acceleration?

Question illustration
A
Object 1
B
Object 2
C
Object 3
D
Object 4
9

Rahul sits in a chair reading a book. Which force is equal to the force Rahul exerts on Earth?

A
Rahul’s weight
B
Rahul's mass
C
the sum of the weights of Rahul and the book
D
the sum of the weights of the chair, Rahul, and the book
10

According to Newton’s first law of motion, when will an object at rest begin to move?

A
when its inertia decreases to zero
B
when an unbalanced force acts upon it
C
when the action and reaction forces are equal
D
when two equal and opposite forces act upon it

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