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

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

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Engineering Mechanics
According to Newton's first law of motion,

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
None of these
To every action, there is always an equal and opposite reaction

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Engineering Mechanics
Angle of friction is the

The ratio of minimum friction force to the friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
Angle between normal reaction and the resultant of normal reaction and the limiting friction
The ratio of minimum friction force to friction force acting when the body is in motion

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