Question

Efficiency of a simple machine is always less then 100 %, why what do you mean by velocity ratio is 5?​

Answer 1

Explanation:

the efficiency of a simple machine is always less than a hundred per cent because no machine is frictionless and friction waste of the input energy in the form of heat

velocity ratio of a machine is 5 it state that if the distance has to move five times more distance then the load distance in order to lift the load at a certain height

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Answer 2

Answer:

Because some energy supplied to the working part is used and liberated in form of heat lights sound etc so energy given by source is not fully utilised and sent to sink