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Key terms: law of conservation of energy- energy cannot be created or destroyed. It can be transformed from one form into another, but the total amount of energy never changes Machine- a device used to multiply forces or simply to change the direction of forces Mechanical advantage- the ratio of output force to input force for a machine Pulley- is basically a kind of lever that can be used to change the direction of a force Efficiency- useful work output divided by total work input Fulcrum- pivot point Mechanical energy can turn into heat Examples of simple machines are: pulleys, inclined planes, or fulcrum When you think of conservation of energy think about things that are falling or thrown up in the air
