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A Machine

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-97

2025-11-05

1185

is a mechanical device used to apply force advantageously. If a machine could be made to operate without friction, the work applied by it would be exactly equal to the work employed in operating it. Since it is impossible to make such a perfect machine, the work applied by a machine, the output, is always less than the work put into it, the input.