ABSTRACT
When using a spanner to tighten a nut, a force tends to turn the nut in a clockwise direction. This turning effect of a force is called the moment of a force or, more briefly, just a moment. The size of the moment acting on the nut depends on two factors:
(a) the size of the force acting at right angles to the shank of the spanner, and
(b) the perpendicular distance between the point of application of the force and the centre of the nut.
