ASPECt
Energy: Forms, Transformation, Transfer, and Conservation
Item RG124002: A child places a small stone in a slingshot and pulls the elastic band back. When the elastic band is released, the energy of the stone increases, and the energy of the elastic band decreases.
A slingshot (pictured below) is a device made of a rigid frame and a strong elastic band. A slingshot can be used to propel small objects such as stones or balls. When the elastic band is pulled back and then released, the stone or ball will fly toward the target.
A child places a small stone in a slingshot and pulls the elastic band back. When the elastic band is released, what happens to the energy of the stone and the energy of the elastic band?
- The energy of the stone increases, and the energy of the elastic band increases.
- The energy of the stone increases, and the energy of the elastic band decreases.
- The energy of the stone increases, and the energy of the elastic band stays the same.
- The energy of the stone stays the same, and the energy of the elastic band decreases.
- Distribution of Responses
- Scale Score for Item Difficulty
(200[Easy]-800[Difficult]) - 488
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 862 | 1819 | 47% |
| Grades | |||
| 4–5 | 149 | 331 | 45% |
| 6–8 | 409 | 869 | 47% |
| 9–12 | 304 | 619 | 49% |
| Gender | |||
| Male | 418 | 849 | 49% |
| Female | 435 | 934 | 47% |
| Primary Language | |||
| English | 786 | 1620 | 49% |
| Other | 60 | 151 | 40% |
- Disciplinary Core Ideas
- PS3.A Motion energy is properly called kinetic energy; it is proportional to the mass of the moving object and grows with the square of its speed.
PS3.A A system of objects may also contain stored (potential) energy, depending on their relative positions.
PS3.B When the motion energy of an object changes, there is inevitably some other change in energy at the same time.