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4 marksMotions

CAPE Physics Unit 1 · 2003 · Paper 2 · Question 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.

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  1. 4(b)(i)State Newton's law of universal gravitation.[10 marks]
  2. 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…[1 mark]
  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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