A uniform horizontal support arm is attached to a wall by a pivot at its left-hand end. The arm is 1.8 m long and weighs 120 N. The weight of the arm acts at its centre.
A sign weighing 300 N hangs from the arm at a distance of 1.5 m from the pivot. A vertical cable attached to the right-hand end of the arm pulls upwards. The arm is balanced.
Calculate the upward force exerted by the cable.
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.