Question

8.
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9. கீழ்க்காணும் எண்களில் தழைகீழி இல்லாத எண் A)1 B10 C)-1 D) -2

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Answer 1

(a) A machine is a device by which we can either overcome a large resistive force at some point by applying a small force at a convenient point and in a desired direction or by which we can obtain a gain in the speed.

(b) An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.