What is it
A moment is the turning effect of a force about a pivot point, calculated as force × perpendicular distance from the pivot — used to analyse objects in rotational equilibrium, like a balanced see-saw or a ladder leaning against a wall.
Why it matters
Moments extend mechanics beyond objects moving in a straight line to objects that can rotate or tip over, which is essential for realistic problems involving beams, ladders, and any extended (non-point) object.
Exam tip
Always choose the pivot point strategically — picking a point where an unknown force acts eliminates it from the moments equation entirely, often turning a complex problem into a simple one-step calculation.
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