A technician must rotate a locking lever about pivot P to release a hatch. The hatch releases when the moment about P is at least 8.5 N m.
The technician carries out three tests. In each test, the force acts at right angles to the lever.
| Test | Force in N\text{N}N | Perpendicular distance from P in cm\text{cm}cm |
|---|---|---|
| A | 45 | 18 |
| B | 38 | 24 |
| C | 30 | 26 |
Calculate the moment about P for each test.
The technician wants to release the hatch using the smallest force. Explain which test the technician should use.
The technician pushes with a force of 30 N straight along the lever towards P. Explain why this does not release the hatch.
102 exam-style questions on Edexcel GCSE Physics 9.2 Moments, covering 9.2.1 Rotational effects of forces and moments, 9.2.2 The principle of moments, and 9.2.3 Levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.