Momentum Answers

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1
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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.
2
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A car has a momentum of 20,000 kg • m/s. What would the car’s momentum be if its velocity doubles?

A
10,000 kg • m/s
B
20,000 kg • m/s
C
40,000 kg • m/s
D
80,000 kg • m/s
3

Which formula can be used to express the law of conservation of momentum, where p = momentum?

A
pi = pf
B
pi > pf
C
pi < pf
D
pi ≠ pf
4

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
5

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
6

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.
7

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
8

Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it completely and throws Sheila forward onto the pavement.If there is no net force on the system, what is Sheila’s velocity immediately after she is thrown from the bike?

A
1.8 m/s
B
2.0 m/s
C
5.0 m/s
D
5.7 m/s
9

Momentum is a measure of the ________ of an object.Which term accurately completes the sentence?

A
mass
B
motion
C
force
D
weight

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