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4 marksMechanical Properties of Materials

CAPE Physics Unit 1 · May/June 2022 · Paper 2 · Question 3(b)(i)

Tensile stress-strain behavior of a metal wire during loading and unloading (Figure 4).

Describe the behaviour of the metal wire in EACH of the following segments of the graph: AB, BC, CD.

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Other parts of this question

  1. 3(a)(i)Define the term 'stress', and state the unit in which it is measured.[3 marks]
  2. 3(a)(ii)Define the term 'strain', and state the unit in which it is measured.[2 marks]
  3. 3(b)(ii)Explain what is meant by the 'elastic limit' of a wire.[2 marks]
  4. 3(b)(iii)If EACH major interval on the vertical axis of the graph in Figure 4 represents 150 MPa, determine the elastic limit of the wire.[1 mark]
  5. 3(b)(iv)The wire can be described as a ductile material. State TWO properties of ductile materials.[2 marks]
  6. 3(b)(v)In terms of the wire, what does the interval AD on the graph represent?[1 mark]
  7. 3(b)(vi)State how the energy per unit volume stored in the wire during the loading process can be determined from the graph.[1 mark]
  8. 3(c)(i)State what is meant by the term 'high tensile strength'.[1 mark]
  9. 3(c)(ii)Using the graph in Figure 5, explain how the properties of spider silk make it more suitable than silkworm silk for building webs to catch insects.[2 marks]
  10. 3(c)(iii)Using the graph in Figure 5, determine the MAXIMUM amount of energy that can be stored by silkworm silk before it fractures.[3 marks]
  11. 3(c)(iv)Using the graph in Figure 5, determine the Young’s modulus of spider silk for small stresses.[2 marks]
  12. 3(c)(v)An insect flies into a spider’s web and becomes attached to a single thread, creating a tension of 580 μN. The thread extends by approximately 3% of its…[6 marks]

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