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1 markMechanical Properties of Materials

CAPE Physics Unit 1 · 2001 · Paper 2 · Question 3(a)(ii)

An experiment measures the Young's modulus of a wire. Figure 1 shows the setup. A graph of load vs extension is provided. The wire has an original length of 3.50 m and a cross-sectional area of 1.5 x 10⁻⁷ m². The first load measurement was 30 N.

Give ONE source of error that will be encountered during the experiment.

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Other parts of this question

  1. 3(a)(i)List TWO necessary precautions that should be taken during this experiment.[2 marks]
  2. 3(b)(i)Explain why the student's first measurement was done with a load of 30 N.[1 mark]
  3. 3(b)(ii)Determine the Young's modulus for the wire.[3 marks]
  4. 3(c)(i)Sketch the shape of the graph if the elastic limit had been reached at an extension of 6.0 mm.[1 mark]
  5. 3(c)(ii)What is the work done in stretching the wire from an extension of 3.1 mm to an extension of 6.2 mm?[2 marks]

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