Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 12

An air bubble is rising through a liquid at a constant speed. The forces on it are the upthrust U, the viscous drag D and its weight W. Which diagram shows the directions and relative sizes of the forces?

1. AU upward, W downward small, D downward large
2. BU upward, W downward small, D downward large
3. CU upward, D downward small, W downward large
4. DU upward, D upward small, W downward large

As printed in the paper