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