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Science Ch #8

Science vocabulary

WordDefinition
Work The transfer of energy to an object by using a force that causes the object to move in the direction
Joule The unit used to express energy
Power The rate at which work is done or energy is transformed
Watt The unit used to express power
Machine A device that helps do work by either overcoming a force or changing the direction of the applied force
Work Input The work done on a machine
Work Output The work done by a machine
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 output to 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 wires
Wheel and Axle A simple machine consisting of two circular objects of different sizes
Inclined Plane A simple machine that is a 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
Compound Machine A machine made of more tan one simple machine
Created by: 228049
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