The idea
Momentum is conserved in every collision; kinetic energy is not. Keeping those two facts apart is most of what collision problems test.
Lesson
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Questions (3)
| Question | Type | Difficulty | Drift | Accuracy |
|---|---|---|---|---|
| What is the momentum, in kg·m/s, of a 1,200 kg car travelling at 15 m/s? | numeric | Moderate 0.20 | — | — (0) |
| A 2 kg trolley moving at 3 m/s collides with a stationary 4 kg trolley and they stick together. What is their … | numeric | Hard 1.00 | — | — (0) |
| Explain, in terms of impulse, why a car's crumple zone reduces the force on its occupants. | short | Hard 1.40 | — | — (0) |