Pulleys
An exercise machine is a great example of a pulley system. If you can get to a gym or a community center that has weight-lifting machines, check out the pulley system on the machine. What is the mechanical advantage? Why are they using pulleys?
Main page about pulleys
To find out more about machines, check out these books from Amazon.com or from your library:
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Machines
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Science for Kids home page
Kidipede home page
Cite this page: Carr, Karen. "" Kidipede - History for Kids. 2011. http://www.historyforkids.org/scienceforkids/physics/machines/doing/pulley.htm
