The Law of the Lever
The weight and balance problems are based on the
physical law of the lever. This law states that a lever is
balanced when the weight on one side of the fulcrum
multiplied by its arm is equal to the weight on the opposite
side multiplied by its arm. In other words, the lever is
balanced when the algebraic sum of the moments about the
fulcrum is zero. [Figure 2-2] This is the condition in which
the positive moments (those that try to rotate the lever
clockwise) are equal to the negative moments (those that
try to rotate it counter-clockwise).
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