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# Work

### Work and Simple Machines

TermDefinition
work is done when a force exerted on an object causes that object to move some distance; equal to force times distance; measured in joules
power rate at which work is done; equal to the work done divided by by the time it takes to do the work; measured in watts
input force the force that you apply on a machine
output force the force that the machine applies
mechanical advantage how much larger the output force is compared to the input force; equals the ratio of the output force to the input force
efficiency the ratio of the output work to the input work; reducing the amount of friction in a machine will increase efficiency
simple machine a machine that does work with only one movement
compound machine made up of a combination of simple machines
inclined plane a flat, sloped surface; as inclined plane becomes longer, the force needed to move the object becomes smaller
wedge an inclined plane that moves; can have one or two sloping sides
screw an inclined plane wrapped around a cylinder or post; the more tightly wrapped the threads are, the easier it is to turn the screw
lever any rigid rod or plank that pivots, or rotates, around a point
wheel and axle consists of two circular objects of different sizes that are attached in such a way that they rotate together
pulley made of a grooved wheel with a rope or cable wrapped over it
machine makes work easier by changing the amount or force you need to exert, the distance over which the force is exerted, or the direction in which you exert your force
joule the unit of measurement of work
friction the force that acts to oppose sliding between two surfaces that are touching
watt the unit of measurement of power
ideal machine machine with 100% efficiency
fulcrum the point about which a lever pivots
Created by: MsHollinger