Engineering Mechanics
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Principle of conservation of momentum
Principle of conservation of energy
Newton's second law of motion
Newton's first law of motion

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Engineering Mechanics
Which of the following statement is incorrect?

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

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