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19 Cards in this Set
- Front
- Back
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The rate of doing work
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power
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a machine that changes motion
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windmill
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the force that is used to generate electricity
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water falling from a dam
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550 foot-pounds per second
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1 horsepower
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the force that makes things fall toward the earth
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gravity
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work in>work out
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the work principle
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metric measurement of work
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newton-meter
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the product of force times distance
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work
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work is accomplished only when an applied force ______ and object.
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moves
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The metric standard unit of work is the ________.
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newton-meter
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You cannot get ____ work out of a machine than what you put into it.
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more
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The forces that opposes motion in moving parts is _______.
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friction
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a push or pull on an object is _____.
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force
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Newton's discovery concerning how fast an object will change speed is the _____.
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2nd law
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Which law, described by Isaac Newton, reveals that the distance between two objects will affect the force between them?
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Gravitation
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with all machines the work output is _____ than work input
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less
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Some of the work input is always used to overcome ______ in a machine.
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friction
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Friction _____ work accomplished by machines.
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reduces
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Machines are never 100 percent efficient because some work is used to overcome _____ and _______.
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friction
inertia |
