## ACS 8 Science Ch 20

##### Created by:

arosales Teacher on May 3, 2010

ACS 8 Science

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# ACS 8 Science Ch 20

 workthe transfer of energy to an object by using a force that causes the object to move in the direction of the force
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#### Definitions

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; equivalent to the amount of work done by a force of 1N acting through a distance of 1m 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 distance through which the force is exerted
work output
the work done by a machine; the produt of the output force and the distance through which the force is exerted
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
a simple machine that consists of a wheel over which a rope, chain, or wire passes
wheel and axle
a simple machine consisting of two circular objects of the different sizes; the wheel is the larger of two circular objects
inclined plane
a simple machine that is a straight, slanted surface, which facilitates the raising of loands; 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 cosists of an inclined plane wrapped around a cylinder

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