ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item NG012003: When a ball bounces off a floor, the elastic energy of the ball is converted into motion energy and gravitational potential energy.
A rubber ball speeds up as it travels from Position 1 toward the floor. The ball is compressed as it hits the floor (Position 2) and then returns to its original shape as it bounces back up into the air (Position 3).
What happens to the elastic potential energy of the ball as it moves from Position 2 to Position 3?
- New energy is made in the form of elastic potential energy.
- The elastic potential energy of the ball is converted into kinetic energy (motion energy) and gravitational potential energy.
- The elastic potential energy of the ball is used up. It is not converted into any other form of energy.
- The elastic potential energy of a rubber ball cannot change, and, therefore, nothing happens to the elastic potential energy of the ball when it moves from Position 2 to Position 3.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 468
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 3435 | 5768 | 60% |
| Grades | |||
| 4–5 | 487 | 1038 | 47% |
| 6–8 | 1345 | 2357 | 57% |
| 9–12 | 1603 | 2373 | 68% |
| Gender | |||
| Male | 1509 | 2613 | 58% |
| Female | 1812 | 2971 | 61% |
| Primary Language | |||
| English | 3122 | 5145 | 61% |
| Other | 211 | 429 | 49% |