Physics (AS & A Level) · Oct / Nov 2023 · Paper 12 · Question 7

Two blocks, of mass 0.20 kg and 0.50 kg, are connected by a light inextensible string that passes over a frictionless pulley. The blocks are initially held stationary. The block of mass 0.20 kg rests on a rough horizontal surface. The block of mass 0.50 kg is suspended in air. Air resistance is negligible. When the blocks are released, they have an acceleration of magnitude 2.0 m s–2. What is the magnitude of the frictional force between the block of mass 0.20 kg and the rough surface?

1. A3.5 N
2. B3.9 N
3. C4.5 N
4. D6.3 N

As printed in the paper