A force of 18 N acts at right angles to a spanner, 0.25 m from the nut. What is the moment about the nut?
4.5 N m4.5\ \mathrm{N\,m}4.5 Nm
18.25 N m18.25\ \mathrm{N\,m}18.25 Nm
72 N m72\ \mathrm{N\,m}72 Nm
0.014 N m0.014\ \mathrm{N\,m}0.014 Nm
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.