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Chapter 5: Work

Vocabulary

TermDefinition
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 is the force that is applied to the machine.
output force is the force applied by the machine.
mechanical advantage the ratio of the output force to the input force of a machine.
efficiency is a measure of how much of the work put into a machine is changed into useful output work by the machine.
simple machine is a machine that does work with only one movement of the machine.
lever is a bar that is free to pivot or turn around a fixed point.
pulley is a grooved wheel with a rope, chain, or cable running along the groove.
wheel and axle is a simple machine consisting of a shaft or axle attached to the 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 is an inclined plane wrapped in a spiral around a cylindrical post.
wedge is an inclined plane with one or two sloping sides.
compound machine machine that is a combination of two or more simple machines.
Created by: IsabelVargas21
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