A theatre spotlight is tilted by a rigid control arm that turns about a pivot. A moment of at least 7.2 N m is needed to tilt the spotlight. A motor pushes on the control arm at right angles to it, 40 cm from the pivot. The motor can be set to push with a force of 0.18 N, 2.9 N, 18 N or 180 N. Which is the smallest force setting that will tilt the spotlight?
The 0.18 N0.18\ \text{N}0.18 N setting
The 18 N18\ \text{N}18 N setting
The 2.9 N2.9\ \text{N}2.9 N setting
The 180 N180\ \text{N}180 N setting
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.