Pulley

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A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a cable or belt along its circumference.[1] Pulleys are used in a variety of ways to lift loads, apply forces, and to transmit power. In nautical contexts, the assembly of wheel, axle, and supporting shell is referred to as a "block."
  1. {{#invoke:citation/CS1|citation |CitationClass=book }}