http://mocomi.com/ presents: What is a Pulley?
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.
When you put two or more wheels together, and run a rope around them, you have created a great lifting machine.
As you add more pulleys, you increase your
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