# Preap Physics Exam #5 Numbers 11-15

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• 1.

### 11. Two objects stick together and move with a common velocity after colliding. Identify the type of collision.

• A.

A. Elastic

• B.

B. Inelastic

• C.

C. Perfectly elastic

• D.

D. perfectly inelastic

D. D. perfectly inelastic
Explanation
In a perfectly inelastic collision, two objects stick together after colliding and move with a common velocity. This means that the kinetic energy of the system is not conserved, as some of the energy is lost in the collision and converted into other forms such as heat or deformation.

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• 2.

### 12. Two billiard balls collide. Identify the type of collision.

• A.

A. Elastic

• B.

B. Inelastic

• C.

C. perfectly elastic

• D.

D. perfectly inelastic

A. A. Elastic
Explanation
The correct answer is elastic. In an elastic collision, the kinetic energy is conserved before and after the collision. This means that the total energy of the system remains constant. In the case of billiard balls colliding, if they bounce off each other and continue moving with the same speed and direction as before the collision, it is considered an elastic collision.

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• 3.

### 13. Two balls of dough collide and stick together. Identify the type of collision.

• A.

A. Elastic

• B.

B. Inelastic

• C.

C. perfectly elastic

• D.

D. perfectly inelastic

D. D. perfectly inelastic
Explanation
When two balls of dough collide and stick together, it is considered a perfectly inelastic collision. In a perfectly inelastic collision, the two objects stick together and move as one after the collision. The kinetic energy is not conserved in this type of collision, as some of it is lost due to deformation or other factors. In this case, the balls of dough stick together, indicating that they have become one object and are moving together.

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• 4.

### 14. Two cars collide, lock bumpers, and move together after the collision. What kind of collision is this?

• A.

A. elastic collision

• B.

B. inelastic collision

• C.

C. perfectly elastic collision

• D.

D. perfectly inelastic collision

D. D. perfectly inelastic collision
Explanation
In a perfectly inelastic collision, the two objects stick together after the collision and move as one. This means that the kinetic energy is not conserved, as some of it is lost in the collision and converted into other forms of energy, such as heat or sound. In the given scenario, the cars collide, lock bumpers, and move together, indicating that they stick together after the collision. Therefore, it is a perfectly inelastic collision.

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• 5.

### 15. A tennis ball is dropped from 1.0 m, bounces off the ground, and rises to 0.85 m. What kind of collision occurred between the ball and the ground?

• A.

A. elastic collision

• B.

B. inelastic collision

• C.

C. perfectly elastic collision

• D.

D. perfectly inelastic collision

B. B. inelastic collision
Explanation
The fact that the tennis ball bounces off the ground and rises to a lower height than its initial height suggests that some energy was lost during the collision. In an inelastic collision, the objects stick together and kinetic energy is not conserved. Therefore, option b. inelastic collision is the correct answer.

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• Mar 21, 2023
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• Feb 02, 2015
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