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Taking Moments About a Point for Forces at Arbitrary Angles

The easiest way to take moments about a pointfor a force not at right angles to the line joining the point of actionof the force to A is to resolve the force into components parallel toand perpendicular to

The 50N force above has componentsperpendicular toandparallel to

The 80N force has componentsperpendicular toandparallel to

The moments of the forces are then

anticlockwise andclockwise so the net moment due to the two forces is

The components of the forces parallel toandpass throughand do not contribute to the moment.

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