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CAIE A-Level Physics AS 6.2.1 The Terms Elastic Deformation Plastic Deformation and Elastic Limit Questions

Distinguish elastic deformation, plastic deformation and elastic limit from force–extension behaviour.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Distinguish elastic deformation, plastic deformation and elastic limit from force–extension behaviour.

CAIE A-Level Physics AS 6.2.1 The Terms Elastic Deformation Plastic Deformation and Elastic Limit Questions question 1

[Maximum number: 1]

One end of a wire is attached to a fixed point. A force F is applied to the wire to cause extension x. The variation with F of x is shown in Fig. 5.1.

Fig. 5.1

Fig. 5.1

The wire has a cross-sectional area of 4.1×10−7 m24.1 \times 10^{-7} \mathrm{~m}^{2} and is made of metal of Young modulus 1.7×1011 Pa1.7 \times 10^{11} \mathrm{~Pa}. Assume that the cross-sectional area of the wire remains constant as the wire extends.

A force of greater than 45 N is now applied to the wire.

Describe how it may be checked that the elastic limit of the wire has not been exceeded.

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