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PRESENTATION OUTLINE
PULLEYS
- Pulleys make it easier to lift a heavy object
- The more pulleys you have the easier it is
- A good example of this is: if you put ten pulleys together, one person could lift a car.
Photo by Samuel Zeller
WHAT ARE PULLEYS
- Pulleys are a simple machine used used to make lifting heavy objects easier
Photo by Michel_Rathwell
WHO AND WHEN WERE PULLEYS INVENTED
- Possibly by 1500 BC people in Mesopotamia used rope pulleys for hoisting water. Archimedes of Syracuse invented the first compound pulleys 287 BC - 212 BC. Plutarch reported that Archimedes moved an entire warship, laden with men, using compound pulleys and his own strength.Apr 3, 2013 Simple Machine Timeline by Jameka Taylor on Prezi https://prezi.com › simple-machine-timeli...
Photo by gideon_wright
IN TH PAST
- Pulleys were used to carry water and other objects
- When the Great Wall of China was built they probably would have used pulleys
Photo by amishsteve
BIBLIOGRAPHY
- Apr 3, 2013 Simple Machine Timeline by Jameka Taylor on Prezi https://prezi.com › simple-machine-timeli...
- Ducksters
Photo by Al x
