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# Chapter 5 Vocab.

### Work & Machines

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.
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 a force can be applied.
Input Force The force that is applied to the 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 & axle, inclined plane, screw, & wedge.
Lever Simple machine consisting of a bar free to pivot about a fixed point called the fulcrum.
Pulley Simple machine that consists of a grooved wheel with a rope, chain, or cable running along the groove; can be either fixed or movable.
Wheel & Axle Simple machine that consists of a shaft or axle attached to the center of larger wheel, so that the shaft & the wheel rotate together.
Inclined Plane Simple machine that consists of a sloping surface, such as a ramp, that reduces the amount of force needed to lift something by increasing the distance over which the force is applied.
Screw Simple machine that consists of an inclined plane wrpped in a spiral around a cylindrical post.
Wedge Simple machine that is an inclined plane with one or two sloping sides.
Compound Substance formed from two or more elements in which the exact combination & proportion of elements is always the same.
Created by: keissyg

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