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Ch. 5

Vocab

TermDefinition
work transfer of energy that occurs when a force makes an object move; measured in joules.
power amount of work done, or the amount of energy transferred, divided by the time required to do the work or transfer the energy; measured in watts (W).
machine device that makes doing work easier by increasing the force applied to an object, changing the direction of an applied force, or increasing the distance over which force can be applied.
input force the force applied to a machine
output force the force applied by the machine
mechanical advantage ratio of the output force exerted by a machine to the input force applied to the machine.
efficiency ratio of the output work done by the machine to the input work done on the machine, expressed as a percentage.
simple machine machine that does work with only one movement- lever, pulley, wheel and axle, inclined plane, screw, and wedge.
lever simple machine consisting of a bar free to pivot about a fixed point called the fulcrum.
pulley simple machine that consists for a grooved wheel with a rope, chain, or cable running along the groove; can be either fixed or movable.
wheel and axle
inclined plane
screw
wedge
compound machine
Created by: mirandaperkins
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