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Chapter 20

work the transfer of energy to an object by using a force that causes the object to move in the direction of the force W=F*d
joule unit of work
power the rate at which work is done or energy is transformed
watt power unit
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 MA= output force/input force
mechanical efficiency ratio of work output to work input ME= work output/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 a rope, chain, or wire passes
wheel and axle 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 loads; ramps
wedge a simple machine that is made up of two inclined planes and that moves; often used for cutting
screw a simple machine consists of an inclined plane that is wrapped around a cylinder
compound machine a machine made of more than one simple machine
Created by: 100000469569106