Item RG054003: A spring has more energy if it is compressed more.
Two children are racing toy cars. At the beginning of the race, they each push their car against a spring. The child with Car #1 pushes the spring in as far as the spring can go. The child with Car #2 pushes the spring in just a little bit. To have a fair race, the children use springs and cars that are exactly the same.
Which spring has more energy just before the children let go of the cars and why?
- The spring with Car #1 has more energy because it is pushed in more than the other spring.
- The spring with Car #2 has more energy because it can still be pushed in farther, but the other spring is already pushed in as far as it can go.
- Both springs have the same amount of energy because the springs are exactly the same.
- Neither spring has any energy because the springs are not moving before the children let go.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 448
- Students Responding Correctly
Group | Correct | Total | Percent |
---|---|---|---|
Overall | 1714 | 2485 | 69% |
Grades | |||
4–5 | 687 | 953 | 72% |
6–8 | 482 | 755 | 64% |
9–12 | 545 | 777 | 70% |
Gender | |||
Male | 819 | 1182 | 69% |
Female | 854 | 1255 | 68% |
Primary Language | |||
English | 1530 | 2218 | 69% |
Other | 138 | 206 | 67% |