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Edexcel IGCSE Physics 1.23 Hooke’s law region

Practise reading force-extension graphs to decide where Hooke’s law applies and when a material stops behaving proportionally.

Syllabus
First assessment 2019
Course
Physics 4PH1

Exam points

  • sketch or recognise a straight force-extension line through the origin for Hooke’s law
  • use a curved or changing-gradient graph to show that a rubber band is not obeying Hooke’s law
  • locate the elastic limit on a force-extension graph before the fully curved region

1.23 Hooke’s law region question 1

[Maximum number: 1]

A student stretches a rubber band.

The diagram shows a force-extension graph for a rubber band.

Figure for Question 1.23 Hooke’s law region question 1 — Edexcel IGCSE Physics

State how the graph shows that the rubber band does not obey Hooke's law.

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