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Simple Machines — PHYSICS STD 6 — Question

ICSE BoardEnglish MediumSTD 6PHYSICSSimple Machines1 Mark
Question
A machine is 75% efficient’. What do you understand by this statement?
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Answer

If a machine is 75% efficient, it means that 75% of the work input to the machine is obtained as the useful work output. The remaining 25% of the work input has been lost in overcoming the friction.

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