4 Questions

Energy mini quiz.

Questions and Answers

- 1.Two pool balls, each moving at 2 m/s, roll toward each other and collide. Suppose after bouncing apart, each moves at 4 m/s. This collision violates conservation of
- A.
Momentum

- B.
Energy

- C.
Both a & b

- D.
Neither of these

- E.
Both c & d

- 2.In a pendulum, if the KE decreases
- A.
The PE is increased

- B.
The PE is constant

- C.
Friction will stop the decrease of KE

- D.
PE always equals the force

- 3.When an object is lifted 10m, it gains a certain amount of PE. If the same object is lifted 20m, its potential energy gain is
- A.
Less

- B.
The same

- C.
Twice as much

- D.
Four times as much

- E.
More than 4 times a smuch

- 4.If object A travels at 5 m/s, and object B has the same mass but travels twice as fast. How much more KE will the second object have?
- A.
2 times as much

- B.
4 times as much

- C.
6 times as much

- D.
3 times as much