domingo, 29 de agosto de 2010

How levers work

simple machine:a divice with few parts that makes it easier to do work

effort force: the force applied to a machine



resistance force: the force that a machine acts against


lever: a simple machine made of  a rigid bar on a pivot point



fulcrum: the pivod point of a lever


machanical advantages:the number of times a machine multiplies the force applied



pulley: a grooved wheel that turns by the action of a rope in the groove



wheel and axle: a simple machine made of a handle or axis attached to the center of a wheel


No hay comentarios:

Publicar un comentario