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15 marksMechanical Properties of Materials

CAPE Physics Unit 1 · 2002 · Paper 2 · Question 9(c)(v)

A load of 30 N is hung from a copper wire 5 m long and 1.0 mm in diameter to keep it taut. Weights are then added, and the corresponding increase in lengths is read off from a scale. The readings are recorded in the table.

Calculate the elastic energy stored in the wire just before the wire became permanently stretched.

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Other parts of this question

  1. 9(a)Define 'tensile stress' and 'tensile strain'.[2 marks]
  2. 9(b)Show how is k related to the Young's Modulus E of the wire.[3 marks]
  3. 9(c)(i)Plot a graph of load against extension using the values from the table.[15 marks]
  4. 9(c)(ii)Use the graph plotted in (c)(i) to calculate the Young Modulus of Copper.[15 marks]
  5. 9(c)(iii)What is the maximum load that can be supported by the wire?[15 marks]
  6. 9(c)(iv)What was the stress at the proportional limit?[15 marks]

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