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

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Engineering Mechanics
The term 'Centroid' is

The same as centre of gravity
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
The point of suspension
None of the listed here

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