Question

$what \: are \: machines \:$
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Answer 1

Answer:

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A machine (or mechanical device) is a mechanical structure that uses power to apply forces and control movement to perform an intended action. ... They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems..

Answer 2

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A machine is a thing that is created by people to make work easier. It is a tool or invention which multiplies the effect of human effort.