A force-extension graph for a spring shows a straight line through the origin up to a certain point, beyond which the line curves. What does the point where the line begins to curve represent?

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Question

A force-extension graph for a spring shows a straight line through the origin up to a certain point, beyond which the line curves. What does the point where the line begins to curve represent?

Accepted Answer

The point where Hooke's law no longer applies — The point where the force-extension graph deviates from a straight line is the limit of proportionality (or elastic limit), beyond which Hooke's law F = ke no longer applies. Option A is incorrect — the spring has not broken at this point. Option C is a plausible but incorrect distractor. Option D is not a relevant concept at IGCSE level for this graph.

Answer

The point where Hooke's law no longer applies

Answer

The point of maximum elastic potential energy

Answer

The point where the spring's mass becomes significant

Answer

The breaking point of the spring

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