Ch.8 Vocab
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| work | the transfer of energy to a body by the application of a force that causes the body to move in the direction of the force; it is equal to the product of the magnitude of the component of a force along the direction of displacement
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| joule | the unit used to express energy; equivalent to the amount of work done by a force of 1 N acting through a distance of 1 m in the direction of the force (symbol, J)
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| power | a quantity that measures the rate at which work is done or energy is transformed
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| watt | the unit used to express power; equivalent to a joule per second (symbol, W)
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| machine | a device that helps do work by either overcoming a force or changing the direction of the applied force
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| work input | the work done on a machine; the product of the input force and the distance through which the force is exerted
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| work output | the work done by a machine; the product of the output force and the distance through which the force is exerted
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| mechanical advantage | a number that tells how many times a machine multiplies force; it can be calculated by dividing the output force by the input force
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| mechanical efficiency | the ratio of output to input of energy or of power; it can be calculated by dividing work output by work input
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| lever | a simple machine that consists of a bar that pivots at a fixed point called a fulcrum; types include first-class, second-class and third-class levers
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| pulley | a simple machine that consists of a wheel over which a rope, chain, or wire passes
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| wheel and axle | a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
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| inclined plane | a simple machine that is a straight, slanted surface, which facilitates the raising of loads; a ramp
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| wedge | a simple machine that is made up of two inclined planes and that moves; often used for cutting
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| screw | a simple machine that consists of an inclined plane wrapped around a cylinder
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| compound machine | a machine made of more than one simple machine
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Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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