1. The moment of a force about a given point is found by multiplying the magnitude of the force by the perpendicular distance from the point to the line of action of the force:

 $ClockwisemomentofFaboutP=|F|\timesd$

If the distance known is not the perpendicular distance, then trigonometry may be used to find the perpendicular distance and calculate the moment:

$ClockwisemomentofFaboutP=|F|\timesdsin \theta$

Note that the direction, clockwise or anticlockwise, must be specified when talking about a moment.  The standard units for moments are newton metres (N m).

Calculate the moment about P of the forces indicated in each of the following diagrams:

(i)

(ii)

(iii)