Differentiate between ideal machine and practical machine
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Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done.
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(i) The efficiency of an ideal machine (free from friction etc) is equal to 1. But in actual practical, the efficiency is less than 1 due to the energy loss in friction.
(ii) A single machine cannot act as a force multiplier and a speed multiplier at the same time.
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