A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2019 · 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?

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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

D: Work is done by the upthrust on the cylinder.

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 16.

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