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4 marksMechanical Properties of Materials

CAPE Physics Unit 1 · 2010 · Paper 2 · Question 3(b)(iv)

A rubber strip with a cross-section of 3 x 10⁻³ m by 1.5 x 10⁻³ m is suspended vertically. Various masses are attached, and data for length versus load is obtained. Table 2 shows this data.

Use your graph to determine Young's modulus for the rubber for small loads.

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Other parts of this question

  1. 3(a)(i)In the spaces provided, sketch graphs of load versus extension for a steel wire, glass and a polymeric material.[3 marks]
  2. 3(a)(ii)Define the terms 'stress' and 'strain'.[2 marks]
  3. 3(b)(i)Fill in the missing values of extension, ΔL, in the table.[1 mark]
  4. 3(b)(ii)On the grid on page 11, draw a graph of load versus extension.[4 marks]
  5. 3(b)(iii)Write an equation relating M and ΔL for small loads to Young's modulus E for the rubber. Write an equation relating Young's modulus and the gradient of your…[2 marks]

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