Physics (AS & A Level) · Oct / Nov 2025 · Paper 14 · Question 9

A sphere moves vertically downwards at terminal (constant) velocity in a liquid. Which statement about the magnitude of the upthrust acting on the sphere is correct?

1. AIt is proportional to the acceleration of free fall.
2. BIt is equal to the weight of the sphere.
3. CIt is proportional to the density of the sphere.
4. DIt is proportional to the square of the radius of the sphere.

As printed in the paper