Original Project
Force and Motion
If a force acts on an object in the same direction as the direction of its motion, the object’s speed will con…
Item FM102001: A ball thrown into the air goes slower and slower on the way up, stops, and then moves faster and faster as it comes down.
A ball is thrown straight up into the air. What happens to the ball’s speed as it goes up and as it comes down?
- The ball goes up at a constant speed, stops, and then comes down at a constant speed.
- The ball goes up at a constant speed, stops, and then moves faster and faster as it comes down.
- The ball moves slower and slower as it goes up, stops, and then comes down at a constant speed.
- The ball moves slower and slower as it goes up, stops, and then moves faster and faster as it comes down.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 411 | 902 | 46% |
| Grades | |||
| 6–8 | 246 | 585 | 42% |
| 9–12 | 163 | 313 | 52% |
| Gender | |||
| Male | 224 | 416 | 54% |
| Female | 175 | 465 | 38% |
| Primary Language | |||
| English | 365 | 780 | 47% |
| Other | 37 | 105 | 35% |
- 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.