A uniform horizontal lighting boom is 3.0 m long and pivots at the wall. Its weight is 120 N. A lamp weighing 80 N hangs 2.4 m from the pivot. A vertical cable supports the boom at its outer end.
Calculate the force in the cable when the boom is in rotational equilibrium.
The cable is moved so that it supports the boom 2.0 m from the pivot. Calculate the new force in the cable when the boom is in rotational equilibrium.
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.