AnswersMad 2017 Phy Sci B -33 SSNewton's Laws of Motion

Newton's Laws of Motion Answers

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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.
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

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
4

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.
5

A ball has a mass of 140 g. What is the force needed to accelerate the ball at 25 m/s2? (Formula: F=ma)

A
3.5 N
B
115 N
C
165 N
D
4.5 N
6

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
7

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
8

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
9

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
10

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

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