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# Chapter 8 Vocabulary

Work the transfer of energy to an object by using a force that causes the object to move in the direction of the force.
Joule the unit used to express energy; equal to the amt. of work done by a force of 1 N acting through a distance of 1 M in the direction of the force (symbol, J)
Power the rate at which work is done or energy is transformed
Watt the unit used to express power; equivalent to joules per second (symbol,W)
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; the product of the input force and the output force and the distance through which the 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 output to 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 machine that consists of a wheel over whcih a rope, chain, or wire passes
Wheel and Axle machine that consists of two circular objects of different sizes, the wheel is the largest of the other two circular objects
Inclined Plane machine that is a straight, slanted surface, which facilitates the raising of loads; ex. a ramp
Wedge a machine made up of two inclined planes and that moves; often used for cutting
Screw a machine that consists of an inclined plane wrapped around a cylinder
Compound Machine a machine made of more than one simple machine
Work Output the work done by a machine; the product of the output force and the distance through which the force is exerted
Created by: C.Ashton