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Cambridge AS & A Level Physics

4.2Equilibrium of forces

Equilibrium 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. 4.2.1State and apply the principle of moments.
  2. 4.2.2Recognise equilibrium as no resultant force and no resultant torque.
  3. 4.2.3Represent coplanar forces in equilibrium by a vector triangle.

Lessons

  • Equilibrium of forces and the principle of moments

    40 min

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Sample question

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

Equilibrium of forces: sample question

1 mark

On a see-saw pivoted at its centre, Chipo (weight 400 N400\ \text{N}) sits 1.5 m1.5\ \text{m} from the pivot. How far from the pivot, on the other side, must her father (weight 750 N750\ \text{N}) sit to balance her? Give your answer in m.

Answer in m.

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