AnswersWA-Physical Science BLab: Newton's Laws of Motion

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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
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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

A NASA explorer spacecraft with a mass of 1,000 kg takes off in a positive direction from a stationary asteroid.If the velocity of the spacecraft is 250 m/s and the asteroid is pushed back –25 m/s, what is the mass of the asteroid? Assume there is no net force on the system.

A
100 kg
B
6,250 kg
C
10,000 kg
D
6,250,000 kg
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

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
6

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.
7

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
8

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
9

A 50 kg pitcher throws a baseball with a mass of 0.15 kg. If the ball is thrown with a positive velocity of 35 m/s and there is no net force on the system, what is the velocity of the pitcher?

A
−0.1 m/s
B
−0.2 m/s
C
−0.7 m/s
D
−1.4 m/s
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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