Original Project
Force and Motion
Item FM068003: Use of tables of speed versus time, and information about the speed of an object, to determine the forces acting on the object at various times.
The table below gives the speed of an object every minute from 9:00 am to 9:06 am.
| Time → | 9:00 am | 9:01 am | 9:02 am | 9:03 am | 9:04 am | 9:05 am | 9:06 am |
| Speed → | 10 m/s | 10 m/s | 10 m/s | 10 m/s | 11 m/s | 12 m/s | 13 m/s |
Which of the following sets of forces could cause this motion?
- From 9:00 am to 9:03 am, there is a single force of constant strength acting on the object. From 9:03 am to 9:06 am, there are no forces acting on the object.
- From 9:00 am to 9:03 am, there are no forces acting on the object. From 9:03 am to 9:06 am, there is a single force of constant strength acting on the object.
- From 9:00 am to 9:03 am, there is a single force of constant strength acting on the object. From 9:03 am to 9:06 am, there is a single force of increasing strength acting on the object.
- From 9:00 am to 9:03 am, there is a single force of constant strength acting on the object. From 9:03 am to 9:06 am, there is another constant force of greater strength acting on the object.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 404 | 1780 | 23% |
| Grades | |||
| 6–8 | 267 | 1114 | 24% |
| 9–12 | 135 | 658 | 21% |
| Gender | |||
| Male | 179 | 824 | 22% |
| Female | 214 | 910 | 24% |
| Primary Language | |||
| English | 354 | 1567 | 23% |
| Other | 44 | 178 | 25% |
- 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.