Monday, November 08, 2004

Block And Tackle

Combination of a flexible rope, or cable, and pulleys commonly used to augment pulling force; it can be used to lift heavy weights or to exert large forces in any direction. In the Figure there are four freely rotating pulleys, two on the upper block, which remains fixed, and two on the lower block, which moves up as the load W is lifted; one end of the rope is anchored to the upper

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