A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2016 · Q141 Mark

Which diagram best shows the forces acting on a ball falling at a constant velocity through a liquid?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A[Diagram option A: Upthrust and viscous drag upwards, weight downwards (Upthrust greater than weight)]

B[Diagram option B: Viscous drag upwards, upthrust and weight downwards]

C[Diagram option C: Upthrust upwards, viscous drag and weight downwards]

D[Diagram option D: Upthrust and viscous drag upwards, weight downwards (balanced forces)]

✓ Correct answer

D: [Diagram option D: Upthrust and viscous drag upwards, weight downwards (balanced forces)]

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2016 Paper 1 Variant 2, question 14.

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