A rubber band is stretched and then relaxed to its original length. The diagram shows the force-extension graph for this process. [Figure shows a force-extension graph. The loading curve (OPQ) is above the unloading curve (QRO). Area X is the area between OPQ and QRO. Area Y is the area under QRO down to the extension axis.] As the force is increased, the curve follows the path OPQ to extension e. As the force is reduced, the curve follows the path QRO to return to zero extension. The area labelled X is between the curves OPQ and QRO. The area labelled Y is bounded by the curve QRO and the horizontal axis. Which statement about the process is correct?
✓ Correct Answer
The correct answer is B: (Area X + area Y) is the minimum energy required to stretch the band to extension e.
📋 Examiner Report & Trap Analysis
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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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