5 questions · 5 marks · ≈ 5 min
Which row of the table identifies what happens to momentum and kinetic energy in an elastic collision?
| Momentum | Kinetic energy | |
|---|---|---|
| A | conserved | conserved |
| B | conserved | not conserved |
| C | not conserved | conserved |
| D | not conserved | not conserved |
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A particle of mass m has kinetic energy Ek and momentum p. A second particle of mass 2m has kinetic energy 2Ek. Both particles are non‐relativistic.
Which of the following is equal to the momentum of the second particle?
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The diagram shows the momentum of two trolleys, X and Y, before a collision. The mass of each trolley is 0.25 kg.
The two trolleys join together after the collision and move on with a velocity of 1 m s−1 .
Which row of the table is correct for this collision?
| Momentum | Elastic or inelastic collision | |
|---|---|---|
| A | conserved | elastic |
| B | conserved | inelastic |
| C | not conserved | elastic |
| D | not conserved | inelastic |
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A sphere travelling at speed v collides elastically with an identical sphere which is at rest.
After the collision, both spheres move off at an angle θ to the direction of travel of the first sphere, as shown. The spheres have the same speed as each other.
What is the speed of the spheres after the collision?
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Two trolleys are on a straight, frictionless track. Trolley X has mass and is moving at . It collides with a stationary trolley Y of mass . After the collision the two trolleys stick together.
What is the total kinetic energy transferred to the surroundings during the collision?
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