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Powerful Pulleys!(tets)(Brief Article)
A pulley is a wheel with a groove between its edges that holds a wire or rope. A crane lifting heavy weights and a sailor hoisting up a sail both use pulleys. Try the experiment to see how pulleys work.
RELATED ARTICLE: How Do Pulleys Work?
What to observe
How do pulleys help us lift heavy weights?
What you Need
* a spool
* heavy string
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