A-LevelPhysicsDeformation of solidsMay/June 2016Paper 1 Q211 Mark
A metal wire is attached at one end to a fixed point and a load is hung from the other end so that the wire hangs vertically. The load is increased from zero to 20 N. This causes the wire to extend elastically by 5.0 mm. The load is then reduced to 12N and the extension decreases to 3.0 mm. [Figure 21.1] How much strain energy is released during the unloading process?
A0.8 × 10⁻² J
B1.8 × 10⁻² J
C2.4 × 10⁻² J
D3.2 × 10⁻² J
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The correct answer is D. This question tests the candidate's understanding of deformation of solids within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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