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19 Cards in this Set
- Front
- Back
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machine
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A device that makes work easier by changing the size of force applied to it and/or the direction of that force.
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simple machine
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A device that accomplishes work with only one movement. The lever, pulley, wheel and axle, inclined plane, screw, and wedge are all simple machines.
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effort force
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The force applied to a machine when a machine is used to do work.
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resistance force
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The force exerted by a machine to overcome resistance to gravity or friction.
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ideal machine
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A machine in which work input equals work output; such a "perfect" would be frictionless and 100 percent efficient.
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mechanical advantage
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The number of times multiplies the effort force applied to it.
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lever
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A simple machine consisting of a bar that is free to pivot (rotate) around a fixed point (fulcrum).
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fulcrum
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The fixed point around which a lever pivots.
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effort arm
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The part of a lever on which an effort force is applied.
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resistance arm
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The part of a lever that exerts the resitance force.
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pulley
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A simple machine consisting of a grooved wheel with a rope or a chain running along or a chain running along the groove.
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wheel and axle
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A simple machine consisting of two different-sized wheels that rotate together, such as a doorknob or wheel-handled faucet.
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inclined plane
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A simple machine consisting of a sloping surface (ramp) used to raise objects.
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screw
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A simple machine consisting of a special type of inclined plane wrapped in a spiral around a cylindrical post.
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wedge
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A simple machine consisting of a moving inclined plane with one or two sloping slides; examples are knives and chisels.
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bionics
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The science of designing artificial replacements (prostheses) for parts of the human body that are not working properly.
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compound machine
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A combination of two or more simple machines.
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efficiency
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The ratio of the useful work put out by a machine to the work put into that machine; efficiency is always less than 100 percent.
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power
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The measure of the amount of work done in a specific amount of time; power is measured in watts and equals 1 joule/second.
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