A circular platform can rotate about a pivot at its centre. Three forces act on the platform. The platform is initially balanced.
| Force | Size of force in N | Direction of moment | Perpendicular distance from the pivot in m |
|---|---|---|---|
| A | 18 | clockwise | 0.40 |
| B | 12 | clockwise | 0.25 |
| C | 30 | anticlockwise | unknown |
Calculate the perpendicular distance of force C from the pivot.
Force B is removed. Explain which direction the platform starts to rotate.
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.