Interesting Facts about Pulleys?

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Pulleys are used to lift objects such as bricks, machines and are also found in the form of cranes. Some interesting facts about pulleys are that they can be made at home by using a stick and some string. No one inventor can be appreciated for creating the pulley because many people used it before that time as well.
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Interesting Facts About Pulleys
Pulleys are simple machines that allow people to move objects that would be too heavy to move otherwise. The basic design of a pulley is a wheel or axle with a rope around it.... More »
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Source: www.ehow.com
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