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Unit 4

Machines Notes

TermDefinition
machine any device that helps people do work by changing the way the work is done.
work input the work that you do on a machine.
work output the work done by the machine on an object.
input force the force you apply to a machine through a distance.
output force the force a machine exerts on an object.
mechanical advantage the number of times a machine multiplies the input force.
Mechanical efficiency a comparison of a machine’s work output with the work input.
lever a simple machine that has a bar that pivots at a fixed point.
wheel and axle a simple machine that is made of a wheel connected to a smaller cylindrical object, the axle.
pulley a simple machine that has a grooved wheel that holds a rope or a cable.
inclined plane a simple machine that is a straight, slanted surface.
wedge a pair of inclined planes that move.
screw an inclined plane wrapped around a cylinder.
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