A uniform metre ruler has a weight of 2.0 N acting at the 50 cm mark. It is pivoted at the 40 cm mark. A 3.0 N weight hangs at the 10 cm mark. What downward force at the 75 cm mark balances the ruler?
3.1 N3.1\ \mathrm{N}3.1 N
2.6 N2.6\ \mathrm{N}2.6 N
2.0 N2.0\ \mathrm{N}2.0 N
4.0 N4.0\ \mathrm{N}4.0 N
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.