A-LevelPhysicsForces, density and pressure9702/12 · Feb/Mar 2019 · Q111 Mark

A ball falls through a liquid at a constant speed. It is acted upon by three forces: an upthrust, a drag-force and its weight. Which statement is correct?

AThe drag-force increases with increasing depth.

BThe drag-force is equal to the sum of the upthrust and weight.

CThe upthrust is constant with increasing depth.

DThe weight is greater than the sum of the drag-force and the upthrust.

✓ Correct answer

C: The upthrust is constant with increasing depth.

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2019 Paper 1 Variant 2, question 11.

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