Etymology
The word "pulley" is derived from the Middle English word "pule," which in turn is derived from the Old French word "poulie." The Old French word is thought to have originated from the Latin word "pula," meaning "wheel."
Meaning
A pulley is a simple machine that consists of a wheel and a rope. The wheel is attached to a frame, and the rope is passed around the wheel. The rope is then attached to the object that is to be moved. When the rope is pulled, the wheel turns and the object is lifted.
Origin
The pulley is one of the oldest simple machines. It is believed to have been invented in ancient Egypt around 2000 BC. The Egyptians used pulleys to lift heavy objects, such as blocks of stone. The pulley was later adopted by the Greeks and Romans, who used it to build bridges and other structures. The pulley is still used today in a variety of applications, including construction, manufacturing, and transportation.
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