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Comparing different pulley systems
Member rating: No Rating | Words: | Submitted: Thu Jan 13 2005
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Comparing different pulley systems Introduction The pulley is a special type of wheel, called a sheave, which has a groove cut into the edge to guide a rope, cable, or chain. Pulleys are used at the top of flagpoles and in some types of window blinds. If a single pulley is used, the mechanical advantage is 1, and the only advantage of using the pulley is that the direction of the force needed is changed. For example, to raise window blinds, a downward pull on a cord is required. When multiple pulleys are combined (in what is called a block and tackle), they can have mechanical advantages greater than 1, because they increase the distance the rope travels, thereby increasing the distance over which the effort is applied. The MA of a block and tackle is equal to the number of strands of rope on the part of the block and tackle that...
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