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### 20 Cards in this Set

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 resistance arm the part of the lever that exerts the resistance force screw a simple machine consisting of a special type of inclined plane wrapped in a spiral around a cylindrical post. wheel and axle a simple machine consisting of 2 different-sized wheels that rotate together, such as a doorknob or wheel-handled faucet. resistance force the force exerted by a machine to overcome resistance to gravity or friction wedge A simple machine consisting of a moving inclined plane with one or two sloping sides; examples are knife and chisels How many simple machines are there? Name them. (6) lever, pulley, wheel and axle, inclined plane, screw, wedge. simple machine a device that accomplishes work with only one movement. pulley a simple machine consisting of a grooved wheel with a rope or chain running along the groove bionics The science of designing artifiacial replacement (prostheses parts for the body. compound machine A combination of 2 or more machines efficinency ratio of the useful work put out by a machine to the work put into that machine; effeiciency is always less than 100% effort arm the part of a lever on which an effort force (F ) is applied power the measure of the amount of work done in a specific amount of time; power is measured in watts and equals 1 joule/second mechanical advantage the number of times a machine multiplies the effort force applied to it. effort force the force applied to a machine when a machine is used to do work. machine a device that makes work easier by changing the size of the force applied to it and /or the direction of that force. Fulcrum the fixed point around which a lever pivots ideal machine a machine in which work input equals work output; such a "perfect" machine would be frictionless and 100% efficient inclined plane a simple machine consisiting of a sloping surface (ramp) used to raise objects lever a simple machine consisting of a bar that is free to pivot (rotate) around a fixed point (fulcrum)