Ch 7 Momentum Review Sheet
CP Physics Momentum, Impulse and Conservation of Momentum Review Sheet
Part 1: Vocabulary
1. Momentum is __________________ in motion.
2. ________________ is equal to the change in momentum.
3. A(n) ____________________ collision occurs when objects bounce off of each other.
4. A(n) ____________________ collision occurs when objects stick together after impact.
5. A(n) ____________________ occurs when objects break apart.
6. The Law of Conservation of Momentum states ___________________________.
Part 2: Application
1. Explain how a bullet and a truck can have the same momentum.
2. List two ways to increase impulse.
3. For the same force, why does a long rifle impart more speed to a bullet than a short pistol?
4. To bring an oil-tanker to a stop, its engines are typically cut off about 25 km from port. Why is it so difficult to stop or turn a supertanker?
5. Explain how two colliding football players can have a total momentum of 0 kg*m/s.
6. How can a moving car double its momentum?
7. In terms of impulse, how can a karate expert break a stack of bricks with their bare hand?
Part 3: Problems
1. A 4 kg cat runs at a speed of 3 m/s. What is its momentum?
2. A 1000 kg car moving 39 m/s applies a braking force of 20 N how long does it take for it to come to a stop?
3. A 900 kg cannon shoots a 5 kg cannonball at 80 m/s. What is the recoil speed of the cannon?
4. A 200 kg car moving 17 m/s hits a 500 kg car at rest. The 200 kg car bounces back at 7 m/s. What is the final velocity of the 500 kg car?
5. A 12,000 kg dump truck moving 5 m/s east has a head on collision with a 500 kg sports car going
50 m/s west. The cars stick together after the collision. What is the velocity of the wreck?
Part 4: True or False and Multiple Choice
True or False
A billiard ball has an elastic collision with a marble.
a. ____ both the billiard ball and the marble have the same acceleration
b. ____ both the billiard ball and the marble feel the same force
c. ____ both the ball and the marble have the same change in momentum
d. ____ both the billiard ball and the marble receive the same impulse
e. ____ The time of collision was the same for both the ball and marble
f. ____ the mass of the billiard ball and the marble are the same
1. As a 1.0 kg object falls to earth, its momentum
a. Increases b. decreases c. stays the same
2. In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is
A) inelastic.
B) completely inelastic.
C) perfectly elastic.
D) any of the above, depending on the mass of the balls.
3. A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. The momentum of the chair
| | a. was zero while stationary and increased when the person stood. |
| | b. was greatest while the person sat in the chair. |
| | c. remained the same. |
| | d. was zero when the person got out of the chair and increased while the person sat. |
4. Which of the following has the most momentum?
a. a more massive thing moving slowly
b. a less massive thing moving slowly
c. a less massive thing moving fast
d. a more massive thing moving fast
e. a very massive thing not moving at all
5. A change in momentum may result from
a. an acceleration
b. a force
c. an impulse
d. all of the above
Part 5: Diagrams
Label the diagram with the type of collision and explain why it demonstrates that type.
[pic] [pic] [pic][pic]
You should also review/study all notes, practice problems and online activities.
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