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Unit 7 Lesson 1 Historical Trail




Historical Trail
A Greek scientist named Archimedes, invented the first pulley system in 260 B.C. . The pulley system enabled a single man to drag a ship.
 
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i)http://www.fi.edu/qa97/spotlight3/
ii)http://library.thinkquest.org/CR0210120/


You can get more information about simple machines and extra information in the following sites.

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