is a mechanical device to which it is applied a force to transform it into one resultant force therefore amending the magnitude of force, direction, and shift length.
This machine complies with the law of conservation of energy (the energy is not created, nor destroyed, only transformed.) Simple machine does not create or destroy the mechanical work applied to it.
http://es.wikipedia.org/wiki/M% C3% A1quina_simple
Andres Rojas Franco
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