A uniform trapdoor of length 1.2 m and weight 40 N is hinged at one end. It is held horizontal by a vertical prop that pushes upwards on the other end. A package of weight 60 N rests on the trapdoor 0.90 m from the hinge.
Calculate the upward force exerted on the trapdoor by the prop.
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.