Original Project
Energy: Forms, Transformation, Transfer, and Conservation
Item NG090002: Assuming no energy transfer between a ball and the track it is moving in, the speed of the ball will be the same before and after rolling over a hill because the total amount of energy in the system does 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 it be going faster, slower, or at the same speed at Position 2 compared to 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.)
- Faster, because new energy in the form of motion energy (kinetic energy) was made when the ball went down the steep side of the hill
- Slower, because motion energy (kinetic energy) was used up when the ball went up the long side of the hill
- The same speed, because the amount of motion energy (kinetic energy) that the ball has remained the same the entire time it was moving along the track
- The same speed, because the total amount of energy in the system (ball and track) did not change as the ball moved along the track
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
|||
|---|---|---|---|---|---|---|---|
| n = 3002 |
6–8 n = 1903 |
9–12 n = 1087 |
Male n = 1464 |
Female n = 1486 |
English n = 2709 |
Other n = 217 |
|
| A. | 51% | 53% | 49% | 49% | 54% | 52% | 40% |
| B. | 19% | 21% | 16% | 18% | 21% | 19% | 27% |
| C. | 15% | 14% | 17% | 17% | 14% | 15% | 16% |
| D. | 14% | 12% | 18% | 16% | 12% | 14% | 18% |