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CAPE Physics Unit 1 · 2003 · Paper 2 · Question 4(b)(ii)

The Moon orbits the Earth in a circle of radius 400 000 km. Considering only these two objects, state what force or forces act on the Moon and explain how Newton's third law of motion applies to the system.

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Other parts of this question

  1. 4(a)Derive the equation for circular motion, a = rω², where a is the centripetal acceleration, ω is the angular velocity and r the radius of the circle.[4 marks]
  2. 4(b)(i)State Newton's law of universal gravitation.[10 marks]
  3. 4(b)(iii)Find the time for ONE complete revolution of the Moon about the Earth.[1 mark]
  4. 4(c)(i)Calculate the angular velocity, ω, and centripetal acceleration of the mass.[6 marks]
  5. 4(c)(ii)Find the centripetal force acting on the mass and the tension in the string.[1 mark]

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