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Load
Effort
Fulcrum
Second Class Lever
The catapult fucntions by pulling back, or putting effort on one end so that the load is brought back, and then all the effort is released in one go so that an object that once was not able to be lifted not only can be moved, but is moved a great distance. In this way it makes the work much easier.
Levers: Catapult
Hank P.
Photograph. Catapults. KnightForHire. Web. 9 Aug. 2011. .
