A-LevelPhysicsDeformation of solids9702/12 · May/June 2013 · Q221 Mark
A rubber cord hangs from a rigid support. A weight attached to its lower end is gradually increased from zero, and then gradually reduced to zero. [Figure showing a rubber cord with a weight, and a force-extension graph with stretching and contraction curves] The force-extension curve for contraction is below the force-extension curve for stretching. What does the shaded area between the curves represent?
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.
Athe amount of elastic energy stored in the rubber
Bthe amount of thermal energy dissipated in the rubber
Cthe work done on the rubber cord during stretching
Dthe work done by the rubber cord during contraction
✓ Correct answer
B: the amount of thermal energy dissipated in the rubber
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