AnswersAL Physical Science AIntroduction to Forces

Newton's Laws of Motion Answers

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1
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Ana exerts a force of 20 N on a volleyball that has a mass of 0.15 kg. What is the force that the volleyball exerts on Ana?

A
0.15 N
B
20 N
C
19.85 N
D
20.15 N
2
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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
3

Juan inflates a balloon and then releases its end to let the balloon go free as air comes out. The balloon then flies around the room.

A
According to Newton’s first law of motion, the balloon would stay still unless a force caused it to move.
B
According to Newton’s third law of motion, the balloon is pushed forward as the air is forced out.
C
According to Newton’s third law of motion, the balloon resists any change of motion unless an unbalanced force acts upon it.
D
According to Newton’s second law of motion, the balloon exerts a force on the air, which exerts a force back on the balloon.
4

What is the mass of a crate if a force of 200 N causes it to accelerate at 8 m/s2? (Formula: F=ma)

A
25 kg
B
192 kg
C
208 kg
D
16 kg
5

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

A
first
B
second
C
third
D
fourth
6

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

R
Rahul’s weight
R
Rahul's mass
t
the sum of the weights of Rahul and the book
t
the sum of the weights of the chair, Rahul, and the book
7

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.
8

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

Question illustration
b
both people exert the same force so that the forces are unbalanced.
n
neither person exerts a force on the door so that the net force is zero.
o
one person exerts more force than the other so that the forces are unbalanced.
b
both people exert the same force so that the forces are balanced.
9

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
10

A force of 5 N accelerates an object. The object’s mass is 50 g. What is the acceleration of the object? (Formula: F=ma)

A
0.01 m/s2
B
0.1 m/s2
C
10 m/s2
D
100 m/s2

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