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21 Cards in this Set
- Front
- Back
work |
force exerted on an object that causes it to move |
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joule |
the amount you do when you exert a force of one newton to move an object the distance of one meter |
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power |
the rate at which one form of energy is transformed into another |
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watt |
the unit of power when one joule of work is done in one second |
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machine |
a device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which an object is exerted |
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force |
a push or pull exerted on an object |
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input force |
the force exerted on a machine |
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output force |
the force exerted on an object by a machine |
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mechanical advantage |
the number of times a machine increases a force exerted on it |
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efficiency |
the percentage of input work that is converted to output work |
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simple machine |
the most basic device for making work easier, these are the smaller building blocks for complex machines |
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inclined plane |
a simple machine that has a flat, sloped surface |
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wedge |
a simple machine that is an inclined plane that moves |
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screw |
a simple machine that is an inclined plane wrapped around a central cylinder to form a spiral |
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lever |
a simple machine that consists of a rigid bar that pivots about a fixed point |
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fulcrum |
the fixed point at which a lever pivots |
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pulley |
a simple machine that consists of a grooved wheel with a rope or cable wrapped around it |
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wheel and axle |
a simple machine that consists of two attached circular objects that rotate about a common axis, each one with a different radius |
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compound machine |
a device that combines two or more simple machines |
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potential energy |
the energy an object has because of it's position; also the internal stored energy of an object, such as energy stored in chemical bonds |
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kinetic energy |
energy that an object has due to motion |