Physics (AS & A Level) · May / June 2026 · Paper 12 · Question 3

Three coplanar forces, P, Q and R, act at a point. The three forces are in equilibrium. The magnitude of P is increased by 10%. The directions of the forces are unchanged. Which percentage increase, if any, is required to the magnitudes of Q and R for the forces to be once again in equilibrium?

1. A% increase in magnitude of Q: 10; % increase in magnitude of R: 10
2. B% increase in magnitude of Q: 0; % increase in magnitude of R: 10
3. C% increase in magnitude of Q: 10\sqrt{2}; % increase in magnitude of R: 10\sqrt{2}
4. D% increase in magnitude of Q: 10; % increase in magnitude of R: 10\sqrt{2}

As printed in the paper