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en.wikipedia.org/wiki/Simple_machine

The idea of a simple machine originated with the Greek ... who studied the Archimedean simple machines: lever, pulley, and screw.

www.newworldencyclopedia.org/entry/Pulley

As is the case with all the simple machines, the origin of the pulley is unknown. When early peoples lifted heavy objects by throwing ...

www.ronstanindustrial.com/how-pulley-system-changed-the-world

Pulley Systems. As is the case with all the simple machines, that these days we couldn't do without, the origin of the pulley system is unknown. It is thought that ...

prezi.com/awargsdp5tuu/the-history-of-simple-machines

Apr 14, 2013 ... Transcript of The History of Simple Machines ... His main focus was lever, pulley, and screw and he was also the first to grasp the concept of ...

quatr.us/physics/pulley-simple-machines-physics.htm

Aug 17, 2017 ... Cite this page: Carr, K.E. PulleySimple machines – Physics. ... Karen Carr is Associate Professor Emerita, Department of History, Portland ...

www.encyclopedia.com/science-and-technology/technology/technology-terms-and-concepts/pulley

Get information, facts, and pictures about pulley at Encyclopedia.com. ... pulley, simple machine consisting of a wheel over which a rope, belt, chain, or cable ...

www.encyclopedia.com/social-sciences-and-law/economics-business-and-labor/businesses-and-occupations/simple-machines

There are six kinds of simple machines: the lever, the pulley, the wheel and axle, ... Probably from the beginning of human history, anyone who ever had a job to ...

eschooltoday.com/science/simple-machines/what-is-a-pulley.html

The Pulley Have you seen your school flag being raised before? This is possible with a simple pulley. When you pull down on the rope, the pulley turns and the ...

www.reference.com/history/history-pulleys-3aaddb45059e1d8d

A pulley is a simple machine that uses a wheel with a groove to hold a cable or a rope. Pulleys are essential to numerous machines, ranging from cranes to ...