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### 17 Cards in this Set

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 Work product of the net force on an object and the distance through which the object is moved Joule the unit of work Power is the rate at which work is done Watt the unit of power ( Joule per second ) Energy the property of an object or that enables it to do work Mechanical energy energy due to the position of something or the movement of something Potential energy (PE) energy that is stored or held in readiness Kinetic energy (KE) energy of motion Work-energy theorem relationship between work and energy Work=(delta)KE Law of conversation 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 is a device used to multiply force or simply change the direction of the forces Lever is a simple machine made of a bar that turns about a fixed point Fulcrum pivot point Mechanical advantage ratio of output force to input force Pulley a kind of lever that is used to change the direction of forces Efficiency useful work output/total work input=actual mechanical adv./theoretical mechanical adv Fuel cell electrolysis process ran backwards in a fuel cell hydrogen and oxygen gas are compressed at electrodes to produce water and electric current