Moment = Force X Perpendicular distance from the pivot
The moment of a force is the turning effect. In real life, levers are used to increase the turning effects by increasing the distance between the forces applied and the point around which the object will turn.
Sum of clockwise moments = Sum of anti-clockwise moments.
Example:
Child A is 1.5m away from pivot at 400N
Child B is d m away from pivot at 300N
( 400 X 1.5 ) / 300 = d d = 2m
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