what is a simple pulley ? what is its main advantage
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Pulley is a simple machine and comprises of a wheel on a fixed axle, with a groove along the edges to guide a rope or cable. Pulleys are used to reduce the time and energy taken to lift heavy objects. Here, Load = the weight of an object Effort = the amount of force required to lift or move this object.
It's advantage is 1. Which means that force required to move the object is equal to the weight of the object
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