Original Project
Energy: Forms, Transformation, Transfer, and Conservation
Item NG094002: Assuming no energy transfer between a ball and the track it is moving in, the amount of energy the ball has after it goes over a hill will be the same as before it went over the hill because the total amount of energy in the system did not change.
Imagine a ball on a track where no energy is transferred between the ball and the track or between the ball and the air around it. It is going fast enough at Position 1 so that it will go over a hill on the track and past Position 2. Position 1 and Position 2 are at the same height.
Will the total amount of energy the ball has at Position 2 be more, less, or the same as the total amount of energy the ball had at Position 1 and why? (Remember that no energy is transferred between the ball and the track or between the ball and the air around it.)
- The total amount of energy the ball has will be more at Position 2 because new energy was made when the ball went down the steep side of the hill.
- The total amount of energy the ball has will be less at Position 2 because energy was used up when the ball went up the long side of the hill.
- The total amount of energy the ball has will be the same at Position 1 and Position 2 because the total amount of energy in the system (ball and track) did not change.
- Whether the total amount of energy of the ball is more, less, or the same at Position 2 compared to Position 1 depends on the speed of the ball before it got to the hill.
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
|||
|---|---|---|---|---|---|---|---|
| n = 2320 |
6–8 n = 1443 |
9–12 n = 872 |
Male n = 1136 |
Female n = 1146 |
English n = 2098 |
Other n = 148 |
|
| A. | 44% | 47% | 40% | 42% | 46% | 44% | 44% |
| B. | 16% | 17% | 15% | 17% | 16% | 16% | 24% |
| C. | 23% | 18% | 31% | 24% | 23% | 23% | 21% |
| D. | 16% | 18% | 14% | 17% | 16% | 17% | 11% |