why is bicycle called complex machine?
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Answer: A complex machine is one that uses more than one simple machine in the same device, e.g. a derailleur uses levers, gears, pulley's to accomplish a gear ratio change.
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A simple machine is one that uses one type of labor saving simple machine, e.g. a pulley, lever, screw, gear, or wheel and axle. A complex machine is one that uses more than one simple machine in the same device, e.g. a derailleur uses levers, gears, pulley's to accomplish a gear ratio change
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