What Exactly Is a Pulley? At its core, a pulley is a grooved wheel with a rope, chain, or cable that runs along its circumference. This elegant yet straightforward component is a type of simple machine with one key purpose: to change the direction or the point of application of a force.
A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt.
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It is constructed by looping a rope or a cable around the groove of the wheel. Therefore, the three main parts of a pulley are the wheel, axle, and rope. A pulley is used for lifting heavy objects by applying force at one end of the rope.
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A pulley is simply a collection of one or more wheels over which you loop a rope (or chain) to make it easier to lift things. Here's an everyday example: Photo: A pulley mounted on a huge lifting frame to make it safer to use.