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Ps ch5


work is the transfer of energy that occurs when a force makes an object move
power is the amount of work done in one second
machine is a device that makes doing work easier
input force force that is applied to the machine
output force force that is applied by the machine
mechanical advantage ratio of the output force to the input force
efficiency a measure of how much of the work put into a machine is changed into useful output work by the machine
simple machine machine that does work with only one movement of the machine
lever a bar that is free to pivot or turn around a fixed point
pulley a grooved wheel with a rope, chain, or cable running along the groove
wheel and axle simple machine consisting of a shaft or axle attached tot he center of a larger wheel, so that the wheel and axle rotate together
inclined plane a sloping surface, such as a ramp that reduces the amount of force required to do work
screw an inclined plane wrapped in a spiral around a cylindrical post
wedge an inclined plane with one or two sloping sides
compound machine two or more simple machines that operate together
Created by: merariramos1