Unit 4 Work Sheet 11



Physics Mr. Harwood Momentum Worksheet 9a

Name___________________ Period______

Momentum – Elastic and Inelastic Collisions

Momentum Elastic Collision Inelastic Collision Impulse

[pic] [pic] [pic] [pic]

1. Two Train cars of identical mass (m = 10.0 kg) collide and move off as shown. The left car was initially traveling at 2.0 m/s right and the right car was initially traveling at a velocity of 3.0 m/s left. After the collision, the left car is traveling at a velocity of 2.5 m/s to the left.

a. What type of a collision is depicted here?

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b. What was the initial momentum of the right car?

c. What was the initial momentum of the left car?

d. What was the final momentum of the left car?

e. What was the final momentum of the right car?

2. Given that the equation for momentum is[pic], how can the momentum of a body change. Hint: there are three ways.

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3. A Passenger car (m = 10.0 kg) and a flat car (m = 7.5 kg) collide and move off as shown. The left car was initially traveling at 3.5 m/s right and the right car was initially traveling at a velocity of 2.2 m/s left.

a. What type of a collision is depicted here?

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b. What was the initial momentum of the right car?

c. What was the initial momentum of the left car?

d. What was the final velocity of the coupled cars? Remember, velocity has both a magnitude and a direction.

4. While standing on a skateboard, a woman (m = 50.0 kg) throws a bowling ball (m = 5.0 kg) to the left as shown. She and the ball are initially at rest. After the ball is thrown, it has a velocity of 6.0 m/s to the left.

a. What is the initial momentum of the ball and of the woman? Explain your answer.

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b. What is the final momentum of the ball?

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c. What is the final velocity (magnitude and direction) of the woman?

5. The momentum before the collision is equal to the momentum ________________ the collision. This

sentence is a statement of the Law of Conservation of _________________________.

For questions 6 to 12, state by circling whether the statement is true or false. If it is false, then rewrite the statement in order to make it a true statement.

6. T F In an elastic collision, the colliding bodies stick together and become one mass.

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7. T F In an inelastic collision, the colliding bodies move off with separate velocities.

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8. T F Impulse is a force multiplied by a velocity.

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9. T F Momentum is a force multiplied by a velocity.

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10. T F Two billiard balls colliding is an example of an inelastic collision.

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11. T F A bullet that is shot at a log and sticks in the log causing the log to fall over is

an example of an inelastic collision.

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12. T F Mass is the same thing as weight.

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Given the below before and after pictures, state by circling whether the collisions are elastic or inelastic. Explain your reason for answering as you did.

13. Elastic Inelastic

Why? ______________________________

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14. Elastic Inelastic

Why? ______________________________

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15. Elastic Inelastic

Why? ______________________________

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16. Elastic Inelastic

Why? ______________________________

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17. Elastic Inelastic

Why? ______________________________

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V2F

V1F

V1I

V2I

VF

V1I

V2I

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