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19 Cards in this Set
- Front
- Back
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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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Effort Arm
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• The part of a lever on which and effort force (Fe) is applied.
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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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Fulcrum
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• The fixed point around which a lever pivots.
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Ideal Machine
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• A machine in which work input equals work output; such a “perfect” machine would be frictionless and 100 percent efficient.
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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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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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Machine
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• A device that makes work easier by changing the size of the force applied to it and/ or the direction of that force.
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Mechanical Advantage
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• The number of times a machine multiplies the effort force applied to it.
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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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Pulley
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• A simple machine consisting of a grooved wheel with a rope of a chain running along the groove.
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Resistance Arm
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• The part of a lever that exerts the resistance force (Fr).
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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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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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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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Wedge
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• A simple machine consisting of a moving inclined plane with one or two sloping sides; examples are knives and chisels.
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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 a wheel-handled faucet.
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