Quotation from: General Science

Written by: Bertha M. Clark


Such an arrangement of a rod or bar is called a lever. In any form of
lever there are only three things to be considered: the point where
the weight rests, the point where the force acts, and the point called
the fulcrum about which the rod rotates.


The distance from the force to the fulcrum is called the force arm.
The distance from the weight to the fulcrum is called the weight arm;
and it is a law of levers, as well as of all other machines, that the
force multiplied by the length of the force arm must equal the weight
multiplied by the length of the weight arm.

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