Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W tan (α + φ)
P = W tanα
P = W (sinα + μcosα)
P = W (cosα + μsinα)

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Engineering Mechanics
Angle of friction is the

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
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

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

None of these
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
To every action, there is always an equal and opposite reaction

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