Original Project
Force and Motion
If a force acts on an object in the direction opposite to the direction of the object’s motion, the object’s…
Item FM004008:
A ball is kicked straight up. The ball's speed decreases as it moves upward. Why does the ball's speed decrease?
A. Because one or more forces are acting to slow the ball down
B. Because a force given to the ball by the kick completely runs out
C. Because a force given to the ball by the kick becomes equal to the force of gravity
D. Because a force given to the ball by the kick becomes less than the force of gravity
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 391 | 1766 | 22% |
| Grades | |||
| 6–8 | 240 | 1079 | 22% |
| 9–12 | 151 | 683 | 22% |
| Gender | |||
| Male | 189 | 827 | 23% |
| Female | 193 | 902 | 21% |
| Primary Language | |||
| English | 352 | 1579 | 22% |
| Other | 30 | 143 | 21% |
- 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. - NRC Framework
- ...evaluate…explanations for consistency with the evidence.