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Chapter8Voca

QuestionAnswer
Work The transfer of energy to an abject by using force that causes the object to move in the direction of the force.
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 1m in the direction of the force.
Power The rate at which work is done or energy transformed
Watt The unit used to express power; equivalent to joules per second.
Machine A device that helps do work be either overcoming a force or changing the direction of the applied force.
Work Input The work done on the machine; the product of the input force and the distance through which the force is exerted.
Work Output The work done by a machine; the product of the output force and the distance through which force is exerted.
Mechanical Advantage A number that tells how many times a machine multiplies force.
Mechanical Efficiency A quantity, usually expressed as a percentage, that measures the ratio of work input; it can be calculated by dividing work output by work input.
Lever A simple machine that consists of a bar that pivots at a fixed point called a fulcrum.
Pulley A simple machine that consists of a wheel over which a rope, chain, or wire passes.
Wheel and Axel A simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects.
Inclined Plane A simple machine that is straight, slanted surface, which facilitates the raising of loads; a ramp.
Wedge A simple machine that is made up of two inclined planes and that moves; often used for cutting.
Screw A simple machine that consists of an inclined plane wrapped around a cylinder.
Compound Machine A machine that is made up of more than one simple machine.
Created by: 100001328300901
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