A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2014 · Q111 Mark
A ball is falling at terminal speed in still air. The forces acting on the ball are upthrust, viscous drag and weight. What is the order of increasing magnitude of these three forces?
Aupthrust → viscous drag → weight
Bviscous drag → upthrust → weight
Cviscous drag → weight → upthrust
Dweight → upthrust → viscous drag
✓ Correct answer
A: upthrust → viscous drag → weight
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