Lever and Fulcrum

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Illustration of a lever with fulcrum F. W represents the weight lifted, P is the force that does the lifting, D is the distance from the fulcrum to the point of application of the force, and d is the distance from the fulcrum to the point where the weight is attached. In all possible relations of the fulcrum, weight, and force the following proportion holds: P:W = d:D.

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Proportions

Source

Claude Irwin Palmer Practical Mathematics for Home Study (New York, NY: McGraw-Hill Book Company, Inc., 1919)

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