A loading platform can rotate about a horizontal pivot. All the forces shown in the table act vertically downwards.
| Force | Size of force | Position | Perpendicular distance from the pivot |
|---|---|---|---|
| A | 160 N | left of the pivot | 0.45 m |
| B | 80 N | left of the pivot | 0.20 m |
| C | 100 N | right of the pivot | 0.40 m |
| D | unknown | right of the pivot | 0.30 m |
The weight of the platform acts vertically downwards through the pivot.
The platform is balanced.
Calculate the size of force D.
Force D is increased to 190 N.
Calculate the resultant moment about the pivot and give its direction.
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.