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2 marksEffects of Forces

CAPE Physics Unit 1 · 2008 · Paper 2 · Question 3(b)(ii)a)

Figure 4 shows a 0.5 kg mass on a steel wire 1 m long and 2 x 10⁻³ m in diameter (Young modulus = 2 x 10¹¹ Pa) being whirled in a vertical circle. The mass is at its lowest position and its velocity at this point is 38 m s⁻¹. The breaking stress of the wire is 7.2 x 10⁸ N m⁻².

At the LOWEST point, calculate the tension in the wire.

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Other parts of this question

  1. 3(a)(i)Explain what is meant by EACH of the following terms. 'Stress': 'Strain':[1 mark]
  2. 3(a)(ii)Mark on the graph the region where the wire obeys Hooke's law.[1 mark]
  3. 3(a)(iii)In the space below, sketch graphs to show how the graph in Figure 3 will change if the material is (a) Glass (b) Rubber[2 marks]
  4. 3(b)(i)On Figure 4 show the forces acting on the mass.[2 marks]
  5. 3(b)(ii)b)At the LOWEST point, calculate the stress experienced by the wire.[2 marks]
  6. 3(b)(ii)c)At the LOWEST point, calculate the extension of the wire.[3 marks]
  7. 3(c)Explain whether or not the wire breaks at this point.[1 mark]

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