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 thebody.
)

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

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