Two cords are wound around a stepped pulley that can rotate about an axle. One cord exerts a force of 14 N at a perpendicular distance of 0.25 m from the axle, producing an anticlockwise moment. The other cord exerts a force of 9.0 N at a perpendicular distance of 0.30 m from the axle, producing a clockwise moment. What additional moment must a brake provide to balance the pulley?
0.80 N m0.80\ \text{N m}0.80 N m anticlockwise
0.80 N m0.80\ \text{N m}0.80 N m clockwise
3.5 N m3.5\ \text{N m}3.5 N m clockwise
2.7 N m2.7\ \text{N m}2.7 N m anticlockwise
124 exam-style questions on AQA GCSE Physics 5.4 Moments, levers and gears, covering 5.4 Moments, levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.