Original Project
Force and Motion
Item FM016004: If a school bus is slowing down, any forces moving it forward would have to be weaker than any forces slowing it down.
A school bus is slowing down as it comes to a stop sign.
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Which of the following statements is TRUE about the forces acting on the school bus while it is slowing down but still moving forward?
- As long as the school bus is still moving forward, the forward force of the school bus has not run out.
- As long as the school bus is still moving forward, any forces moving it forward would have to be stronger than any forces slowing it down.
- If the school bus is slowing down, any forces moving it forward would have to be weaker than any forces slowing it down.
- If the school bus is slowing down, any forces moving it forward would have to be the same strength as any forces slowing it down.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1363 | 3549 | 38% |
| Grades | |||
| 6–8 | 859 | 2255 | 38% |
| 9–12 | 501 | 1284 | 39% |
| Gender | |||
| Male | 659 | 1694 | 39% |
| Female | 678 | 1782 | 38% |
| Primary Language | |||
| English | 1218 | 3196 | 38% |
| Other | 111 | 281 | 40% |
- Disciplinary Core Ideas
- PS2.A The motion of an object is determined by the sum of the forces acting on it; if the total force on the object is not zero, its motion will change. The greater the mass of the object, the greater the force needed to achieve the same change in motion. For any given object, a larger force causes a larger change in motion.
PS2.A Newton's second law accurately predicts changes in the motion of macroscopic objects.