A maintenance worker uses a rigid lever to lift an inspection cover. The cover exerts a downward force of 180 N on one end of the lever, at right angles to the lever and 0.10 m from the pivot. The worker presses down on the other side of the pivot, at right angles to the lever, either 0.60 m or 0.30 m from the pivot.
Explain why the worker must press harder at 0.30 m from the pivot than at 0.60 m to lift the cover.
102 exam-style questions on Edexcel GCSE Physics 9.2 Moments, covering 9.2.1 Rotational effects of forces and moments, 9.2.2 The principle of moments, and 9.2.3 Levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.