AnswersPOP Physics 2627Momentum

Momentum Answers

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Football helmets are made with padding that helps reduce head injuries when a player collides with an object. Which best explains how the padding reduces injuries?

A
It extends the time of the collision.
B
It reduces the time of the collision.
C
It eliminates the reaction force of the object.
D
It eliminates the action force of the object.
2
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The diagram shows two balls before they collide.

Question illustration
A
0.0 kg • m/s
B
0.2 kg • m/s
C
0.3 kg • m/s
D
0.4 kg • m/s
3

The law of conservation of momentum states that, if left alone, what happens to the total momentum of two interacting objects that make up a system?

A
it increases over time
B
it remains the same
C
it eventually becomes zero
D
changes based on how they collide
4

Two carts collide and bounce apart. Cart 1 had a momentum of –6 kg • m/s before the collision. Cart 2 had a momentum of 10 kg • m/s before the collision.

A
–16 kg • m/s
B
–10 kg • m/s
C
4 kg • m/s
D
10 kg • m/s
5

Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement.

A
The grass did not exert a reaction force.
B
The grass did not exert an action force.
C
The grass shortens the time of the collision.
D
The grass extends the time of the collision.
6

The chart show the masses and velocities of two colliding objects that stick together after a collision.

Question illustration
A
4,500 g · m/s
B
1,750 g · m/s
C
1,500 kg · m/s
D
3,000 kg · m/s
7

What is the momentum of a 5 kg object that has a velocity of 1.2 m/s?

A
3.8 kg • m/s
B
4.2 kg • m/s
C
6.0 kg • m/s
D
6.2 kg • m/s
8

The chart lists the masses of four balls that have the same momentum.

Question illustration
A
The green ball has a lower velocity than the purple ball.
B
The red ball has a greater velocity than the purple ball.
C
The yellow ball has a higher velocity than the green ball.
D
The red ball has a greater velocity than the green ball.
9

According to Newton’s third law of motion, which are equal?

A
momentum and velocity
B
collision time and stop time
C
mass and momentum
D
action force and reaction force
10

The chart shows masses and velocities of four objects.

Question illustration
A
W, X, Y, Z
B
Z, Y, X, W
C
Z, X, W, Y
D
Y, W, X, Z

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