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

Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
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
To every action, there is always an equal and opposite reaction
None of these

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Engineering Mechanics
Angle of friction is the

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

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