ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item RG097002: After one ball collides with another, the first ball moves slower because it transferred energy to the second ball when the balls hit each other.
A player rolls Ball A toward Ball B as pictured in Figure 1. Then Ball A hits Ball B. Both balls continue to roll after the collision as shown in Figure 2.
.png)
Which of the following statements correctly describes Ball A’s speed in Figure 2 compared to its speed in Figure 1?
- Ball A is moving faster in Figure 2 because it gained energy from hitting Ball B.
- Ball A is moving slower in Figure 2 because it transferred energy to Ball B when the balls hit each other.
- Ball A is moving slower in Figure 2 because some energy was destroyed when the balls hit each other.
- Ball A is moving at the same speed because no energy was transferred when the balls hit each other.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 464
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 2269 | 3771 | 60% |
| Grades | |||
| 4–5 | 396 | 835 | 47% |
| 6–8 | 960 | 1587 | 60% |
| 9–12 | 913 | 1349 | 68% |
| Gender | |||
| Male | 1071 | 1710 | 63% |
| Female | 1137 | 1940 | 59% |
| Primary Language | |||
| English | 2050 | 3364 | 61% |
| Other | 143 | 269 | 53% |