Engineering Mechanics
The point, through which the whole weight of the body acts, irrespective of its position, is known as

Center of percussion
Center of mass
Moment of inertia
Center of gravity

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Engineering Mechanics
Which of the following statement is incorrect?

The ratio of the limiting friction to the normal reaction is called coefficient of friction
A machine whose efficiency is 100% is known as an ideal machine
The velocity ratio of a machine is the ratio of load lifted to the effort applied
A force acting in the opposite direction to the motion of the body is called force of friction

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