A worker pushes down on a crowbar, which turns about a pivot. The perpendicular distance from the pivot to the line of action of the force is 40 cm. The moment of the force about the pivot is 18 Nm. What is the force applied by the worker?
7.2 N7.2\ \text{N}7.2 N
720 N720\ \text{N}720 N
0.45 N0.45\ \text{N}0.45 N
45 N45\ \text{N}45 N
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.