A-LevelPhysicsForces, density and pressure9702/12 · May/June 2019 · Q121 Mark

A submarine descends vertically at constant velocity. The three forces acting on the submarine are viscous drag, upthrust and weight. Which relationship between their magnitudes is correct?

Aweight < drag

Bweight = drag

Cweight < upthrust

Dweight > upthrust

✓ Correct answer

D: weight > upthrust

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2019 Paper 1 Variant 2, question 12.

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