Original Project
Energy: Forms, Transformation, Transfer, and Conservation
Energy can be transformed (converted) within a system.
Item NG017003: The motion energy of a ball rolling back and forth in a curved track is converted to gravitational potential energy only when it is rolling uphill.
A ball, starting from rest at Position 1, rolls down and then up a curved track towards Position 5. The ball speeds up as it rolls from Position 1 to Position 3, and it slows down as it rolls from Position 3 to Position 5. When it reaches Position 5, it rolls back down the track.
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When is the motion energy (kinetic energy) of the ball being transformed into gravitational potential energy?
- Only when the ball rolls from Position 1 to Position 3
- Only when the ball rolls from Position 3 to Position 5
- The entire time the ball is rolling from Position 1 to Position 5
- It is not being transformed at any time because motion energy (kinetic energy) cannot be transformed into gravitational potential energy.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1003 | 2991 | 34% |
| Grades | |||
| 6–8 | 586 | 1894 | 31% |
| 9–12 | 415 | 1084 | 38% |
| Gender | |||
| Male | 514 | 1422 | 36% |
| Female | 465 | 1504 | 31% |
| Primary Language | |||
| English | 892 | 2626 | 34% |
| Other | 82 | 272 | 30% |