vocab
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| work | transfer of energy that occurs when a force makes an object move measured joules.
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| power | amount of work done or the amount of energy transferred divided by the time required to do the work or transfer the energy measured in watts.
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| machine | device that makes doing work easier by in creasing the force applied to an object changing the direction of an applied force or increasing the distance over which a force or increasing the distance over which a force can be applied.
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| input force | the force that is applied to the machine.
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| output force | the force applied by the machine.
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| mechanical advantage | ratio of the output force exerted by a machine to the input force applied to the mechine.
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| efficiency | ratio of the output work done by the machine to the input work done on the machine expressed as a percentage
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| simple machine | device that makes doing work easier by increasing the force applied to an object changing the distance over which a force can be applied
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| pulley | simple machine that consists of a grooved wheel with a rope chain or cable running along the grove can be either fixed or movable.
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| wheel and axle | simple machine that consists of a shaft of axle attaached to the center of a larger. wheel so that the wheel rotate togather
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| inclined plane | simple machine that consists of a sloping surface such as ramp that reduces the amount of force needed to lift something by increasing the distance over which the force is applied.
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| screw | simple machine that consists of an inclined plan wrapped in a spiral around a cylindrical post.
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| wedge | simple machine that that is an inclined plane with one or two sloping sides
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| compound machine | machine that is a combination of two or more simple machines
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