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16 Cards in this Set

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  • Back
work
the action that results when a force causes an object to move in the direction of the force
joule
the unit used to express work and energy equivalent to the newton-meter
power
the rate at which work is done
watt
teh unit used to express power; equivalent to joules per second
machine
a device that helps make work easier by changing the size or direction or both of a force
work input
the work done on a machine the product of the input force and the distance through which it is exerted
work output
the work done by a machine the product of the output force and the distance through which it is exerted
machanical advantage
a number that tells how many times a machine multiplies force can be calculated by dividing the output force by the input force
machanical efficiency
a comparison expressed as a percentage of a machines work output with the work input can be calculated by dividing work output by work input and then multiplying by 100
lever
a simle machine cnsisting of a bar that pivots at a fixed point called a fulcrum
inclined plain
a simple machine that is a straight slanted surface a ramp
wedge
a simpel machine that si a double inclined plane that moves
screw
a simple machine that is an inclined plane wrapped in a spiral
wheel and axle
a simple machine consisting of two circular objects of different sizes
pulley
a simple machine consisting of one grooved wheel that holds a rope or cable
compound machine
a machine that is made of two or more simple machines