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

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Engineering Mechanics
Which of the following statement is incorrect?

A force acting in the opposite direction to the motion of the body is called force of friction
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

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