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Cambridge AS & A Level Physics

3.3Linear momentum and its conservation

Linear momentum and its conservation in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 3.3.1State the principle of conservation of momentum.
  2. 3.3.2Apply it to elastic and inelastic interactions in one and two dimensions.
  3. 3.3.3Recall that kinetic energy is conserved in an elastic collision and that relative speeds of approach and separation are equal.
  4. 3.3.4Recognise that momentum is always conserved but kinetic energy may change.

Lessons

  • Conservation of momentum, collisions and explosions

    45 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Linear momentum and its conservation: sample question

1 mark

A 2.8 kg2.8\ \text{kg} trolley moving at 3.0 m s−13.0\ \text{m s}^{-1} collides with a stationary 1.2 kg1.2\ \text{kg} trolley and they move off together. What is their common velocity?

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