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

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