A kinetic sculpture has a lightweight horizontal arm that can turn about a pivot. Four ornaments exert vertical downward forces on the arm. The arm is initially balanced.
| Ornament | Side of pivot | Force in N | Perpendicular distance from pivot in m |
|---|---|---|---|
| A | left | 18 | 0.40 |
| B | left | 12 | 0.25 |
| C | right | to be calculated | 0.30 |
| D | right | 10 | 0.15 |
Calculate the size of the force exerted by ornament C.
Ornament A is moved so that its perpendicular distance from the pivot is 0.20 m. The other ornaments are not moved.
Explain the initial direction in which the arm will rotate when released.
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.