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Cambridge AS & A Level Physics

13.4Gravitational potential

Gravitational potential 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. 13.4.1Define gravitational potential as work done per unit mass bringing a small mass from infinity.
  2. 13.4.2Use φ = −GM/r.
  3. 13.4.3Relate gravitational potential to the potential energy of two point masses and use E_P = −GMm/r.

Lessons

  • Gravitational potential and potential energy

    45 min

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Sample question

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

Gravitational potential: sample question

1 mark

At the surface of a planet of radius R, the gravitational potential is φ and the field strength is g. What are the potential and the field strength at a distance 2R from the centre?

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Turn Gravitational potential into a strength.

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