which of the following statement is incorrect?

Question

Which of the following statement is incorrect?

Options:

A . A force acting in the opposite direction to the motion of the body is called force of friction

B . The ratio of the limiting friction to the normal reaction is called coefficient of friction

C . A machine whose efficiency is 100% is known as an ideal machine

D . The velocity ratio of a machine is the ratio of load lifted to the effort applied

Answer: Option D

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