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3 marksEffects of Forces

CAPE Physics Unit 1 · 2014 · Paper 2 · Question 4(c)(iii)

A stone of mass 500 g is attached to a string of length 50 cm which will break if the tension exceeds 20 N. The stone is whirled in a vertical circle. The angular speed is slowly increased until the string breaks.

At what angular speed will the spring break?

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Other parts of this question

  1. 4(a)(i)Explain why a particle moving with constant speed along a circular path has an acceleration.[2 marks]
  2. 4(a)(ii)The value of radial acceleration is given by the expression v²/r, where v is the speed and r is the radius of the path. Using base units, show that this…[2 marks]
  3. 4(b)What is the magnitude and direction of the resultant horizontal force acting on the racing car while it is travelling around the curve?[4 marks]
  4. 4(c)(i)a)Draw a diagram to show the forces acting on the stone in a vertical circle when it is at its highest point.[1 mark]
  5. 4(c)(i)b)Draw a diagram to show the forces acting on the stone in a vertical circle when it is at its lowest point.[1 mark]
  6. 4(c)(ii)In what position along the vertical circular path is the string MOST likely to break? Suggest a reason for your answer.[2 marks]

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