pulley

A pulley is a simple machine that is used to change the direction or magnitude of a force. It consists of a wheel or cylinder that has a groove around its circumference, which is used to guide a rope, cable, or belt. As the rope, cable, or belt is pulled, the pulley rotates, changing the direction of the force and allowing the load to be lifted or moved.

Pulleys are commonly used in a variety of applications, including lifting heavy objects, moving materials in conveyor systems, and powering machinery. They can be made from a variety of materials, including metal, plastic, and wood, and are available in a range of sizes and designs to meet the needs of different applications.