Question

d. when energy is destroyed

1. which quantities are conserved in an elastic collision?

a. momentum only
b. kinetic energy only
c. momentum and kinetic energy
d. force and acceleration

1. what happens to kinetic energy in an inelastic collision?

a. it increases
b. it is conserved
c. it is destroyed
d. it changes into other forms of energy

1. which situation best represents an elastic collision?

a. two cars crashing and sticking together
b. a football tackle
c. a cue ball striking another pool ball
d. a car hitting a wall

1. which statement is true for both elastic and inelastic collisions?

a. kinetic energy is conserved
b. momentum is conserved in a closed system
c. objects always stick together
d. energy is lost from the system

part b: short answer

1. describe one difference between elastic and inelastic collisions.

1. give one real-life example of an inelastic collision and explain why it is inelastic.

part c: data thinking (conceptual)
two carts collide on a frictionless track. after the collision, the total momentum of the system remains the same, but the carts do not bounce apart.

1. is this collision elastic or inelastic? circle one: elastic / inelastic

Explanation:

Multiple Choice Answers:

1. C. Momentum and kinetic energy
2. D. It changes into other forms of energy
3. C. A cue ball striking another pool ball
4. B. Momentum is conserved in a closed system

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Short Answer Explanations:

1. In elastic collisions, total kinetic energy of the system is conserved; in inelastic collisions, total kinetic energy is not conserved (some is converted to other energy forms like heat, sound, or used to deform objects).
2. Example: A glass dropping and shattering on the floor. It is inelastic because kinetic energy from the falling glass is used to break the glass into pieces, produce sound, and create heat, so total kinetic energy of the system is not conserved after the collision with the floor.

Data Thinking Explanation:

1. The collision is inelastic because the carts do not bounce apart, which means some kinetic energy is lost (used to deform the carts or for other non-kinetic energy transfers), and this matches the characteristic of inelastic collisions.

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Final Answers:

1. C. Momentum and kinetic energy
2. D. It changes into other forms of energy
3. C. A cue ball striking another pool ball
4. B. Momentum is conserved in a closed system
5. Elastic collisions conserve kinetic energy; inelastic ones do not.
6. Example: A glass shattering on the floor. Kinetic energy is used to break the glass, so kinetic energy is not conserved.
7. Inelastic

Answer:

Multiple Choice Answers:

1. C. Momentum and kinetic energy
2. D. It changes into other forms of energy
3. C. A cue ball striking another pool ball
4. B. Momentum is conserved in a closed system

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Short Answer Explanations:

1. In elastic collisions, total kinetic energy of the system is conserved; in inelastic collisions, total kinetic energy is not conserved (some is converted to other energy forms like heat, sound, or used to deform objects).
2. Example: A glass dropping and shattering on the floor. It is inelastic because kinetic energy from the falling glass is used to break the glass into pieces, produce sound, and create heat, so total kinetic energy of the system is not conserved after the collision with the floor.

Data Thinking Explanation:

1. The collision is inelastic because the carts do not bounce apart, which means some kinetic energy is lost (used to deform the carts or for other non-kinetic energy transfers), and this matches the characteristic of inelastic collisions.

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Final Answers:

1. C. Momentum and kinetic energy
2. D. It changes into other forms of energy
3. C. A cue ball striking another pool ball
4. B. Momentum is conserved in a closed system
5. Elastic collisions conserve kinetic energy; inelastic ones do not.
6. Example: A glass shattering on the floor. Kinetic energy is used to break the glass, so kinetic energy is not conserved.
7. Inelastic