In a real machine, is M.A. always equal to V.R.?
ANo, M.A. is less than V.R. because of friction
BYes, always in standard practice
CM.A. exceeds V.R. in standard practice
DThey are unrelated
Answer & Solution
Correct answer: A. No, M.A. is less than V.R. because of friction
1. Friction and weight of moving parts dissipate energy.
2. Useful work output is less than the work input.
3. M.A. = (V.R.) * efficiency, with efficiency below 1 for real machines.
4. So M.A. is less than V.R. in real machines.
5. They become equal only in the ideal frictionless case.
_Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_
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