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Cambridge AS & A Level Physics

4.1Turning effects of forces

Turning effects of forces 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. 4.1.1Treat the weight of an object as acting at its centre of gravity.
  2. 4.1.2Define and apply the moment of a force.
  3. 4.1.3Recognise a couple as a pair of forces that causes rotation only.
  4. 4.1.4Define and apply the torque of a couple.

Lessons

  • Centre of gravity, moments, couples and torque

    35 min

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Sample question

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

Turning effects of forces: sample question

1 mark

A force of 45 N45\ \text{N} is applied at right angles to a door at a perpendicular distance of 0.28 m0.28\ \text{m} from the hinges. Calculate the moment about the hinges, in N m.

Answer in N m.

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