A-LevelPhysicsDeformation of solids9702/12 · May/June 2015 · Q221 Mark
A long, thin metal wire is suspended from a fixed support and hangs vertically. Masses are suspended from its lower end. The load on the lower end is increased from zero and then decreased again back to zero. The diagram shows the force-extension graph produced. [Figure showing a force-extension graph. A curve starts from origin, goes up linearly to S, then curves further up to T, and then decreases along a path that returns to a non-zero extension R at zero force.] Where on the graph would the elastic limit be found?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Aanywhere between point R and point S
Bjust beyond point S
Cexactly at point S
Dexactly at point T
✓ Correct answer
B: just beyond point S
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