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S5 Physics: Momentum and Collisions – Advanced Practice (10 Questions)
S5 Physics: Momentum and Collisions – Advanced Practice (10 Questions)
Move on to collisions and impulse: 5 kg at 6 m/s sticking to 10 kg gives 2 m/s, 4 kg against 2 kg cancels to zero, a 0.1 kg ball reversing 50 m/s in 0.01 s needs 500 N, 2 kg stopping hands 6 units to 4 kg, and 30 N for 0.2 s raises a ball to 16 m/s.
Quick answer Sticking 5 kg at 6 m/s to 10 kg gives 2 m/s; 4 kg against 2 kg cancels; a 0.1 kg ball reversing 50 m/s in 0.01 s needs 500 N; 2 kg stopping hands 6 units to 4 kg; 3 kg slowing to 0.5 m/s leaves 4.5 m/s for 1 kg; 30 N for 0.2 s gives 16 m/s; a 1 200 kg car stopping in 0.6 s needs 30 000 N.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 questions |
| Suggested time | about 25 minutes |
| Difficulty mix | Foundation 3 · Intermediate 4 · Challenge 2 · Error redo 1 |
| Chapter | Chapter: S5 Physics | Momentum and Collisions: Conservation, Impulse and Collision Types |
| Level | S5 |
02 Questions (10 items)
- FoundationA 5 kg body at 6 m/s hits a stationary 10 kg body and they stick. What is the common velocity?
- FoundationA 4 kg body at 2 m/s east meets a 2 kg body at 4 m/s west head on and they stick. What is the common velocity?
- FoundationA 0.1 kg ball arrives at 20 m/s and is hit back at 30 m/s in 0.01 s. What is the average force?
- IntermediateA 2 kg body at 3 m/s east hits a stationary 4 kg body and stops. What is the velocity of the 4 kg body?
- IntermediateA 3 kg body at 2 m/s east hits a stationary 1 kg body and slows to 0.5 m/s. What is the velocity of the 1 kg body?
- IntermediateA 0.5 kg ball moving at 4 m/s is kicked forward with 30 N for 0.2 s. What is its speed afterwards?
- IntermediateA 1 200 kg car at 15 m/s stops against a wall in 0.6 s. What is the average force?
- ChallengeA 5 kg body at 2 m/s sticks to a stationary 1 kg body. How much kinetic energy is lost?
- ChallengeA 100 g ball hits a wall at 10 m/s and rebounds at 10 m/s. Find the change in momentum and in kinetic energy.
- Error redoA student claims that because energy is lost in a collision, momentum cannot be conserved either. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 2 m/s, since momentum 30 shared by a total mass of 15 gives 2. | For a perfectly inelastic collision use momentum only, never kinetic energy. |
| 2 | Zero, because 8 minus 8 leaves no momentum, so the pair stops. | When the momenta cancel the combined body can come to rest. |
| 3 | 500 N, from a momentum change of 5 divided by 0.01 s. | Impulse equals the momentum change, so a shorter contact needs a bigger force. |
| 4 | 1.5 m/s east, since the whole 6 unit momentum goes to 4 kg. | Check it back with p equals mv, number and unit together. |
| 5 | 4.5 m/s east, from 6 minus 1.5 divided by 1. | Find the total momentum first, then take away what the first body keeps. |
| 6 | 16 m/s, since the impulse of 6 raises the speed by 12 on top of 4. | Compute the impulse as force times time, then divide by mass for the speed change. |
| 7 | 30 000 N, since 18 000 units of momentum divide by 0.6 s. | Check it back with p equals mv, number and unit together. |
| 8 | About 1.67 J, since 10 J falls to 8.33 J when 6 kg moves at five thirds of a metre per second. | A perfectly inelastic collision always loses kinetic energy, which becomes heat and sound. |
| 9 | Momentum changes by 2 kg m/s while kinetic energy stays at 5 J either side. | A bounce at unchanged speed reverses momentum only and leaves kinetic energy alone. |
| 10 | With no external force momentum is conserved in every collision; an inelastic collision loses kinetic energy, not momentum. | Momentum needs the absence of external force, not an elastic collision. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
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