A-LevelPhysicsDeformation of solids9702/12 · May/June 2020 · Q191 Mark
A student is investigating the mechanical properties of a metal. He applies different loads to a long thin wire up to its breaking point, and measures the extension of the wire for each load. He then plots a graph of stress against strain. [Figure 19.1] The student repeats the experiment with a wire made from the same metal, with twice the original length and half the diameter. Which graph is obtained? [Figure 19.2]
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AGraph with stress / 10^6 Pa (max 4) and strain / 10^-3 (max 80), showing a curve that is less steep than the initial graph.
BGraph with stress / 10^6 Pa (max 4) and strain / 10^-3 (max 40), showing a curve identical to the initial graph.
CGraph with stress / 10^6 Pa (max 16) and strain / 10^-3 (max 80), showing a curve that is twice as steep as the initial graph.
DGraph with stress / 10^6 Pa (max 16) and strain / 10^-3 (max 40), showing a curve that is four times as steep as the initial graph.
✓ Correct answer
B: Graph with stress / 10^6 Pa (max 4) and strain / 10^-3 (max 40), showing a curve identical to the initial graph.
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