A-LevelPhysicsWork, energy and powerOct/Nov 2019Paper 1 Q161 Mark
A wooden cylinder floats partially submerged in a bath of water. A force F is applied to the cylinder until it is just fully submerged. [Figure showing a wooden cylinder floating in water, and a second image showing the cylinder fully submerged by a downward force F] Which statement is not correct?
ASome of the water gains gravitational potential energy.
BThe cylinder loses gravitational potential energy.
CWork is done by force F on the cylinder.
DWork is done by the upthrust on the cylinder.
✓ Correct Answer
The correct answer is D: Work is done by the upthrust on the cylinder.
📋 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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