(a(i))[1]
Define the moment of a force about a point.
(a(ii))[1]
Determine the SI base units of the moment of a force.
(b)[3]
A uniform rigid rod with length $2.4\,\text{m}$ is shown in Fig. 1.1. It has weight $5.2\,\text{N}$ and is made of wood with density $790\,\text{kg m}^{-3}$. Calculate the cross-sectional area $A$, in $\text{mm}^2$, of the rod.
(c(i))[1]
Show that the component of the weight that is perpendicular to the rod is $4.3\,\text{N}$.
(c(ii))[3]
By taking moments about end $A$ of the rod, calculate the tension $T$.