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Angle of Repose

Ʃ f x = 0  -W sin α + f =0                                       Or  f =W sin

       Ʃ F y =0

N =W cos α

From (5.3) and (5.4)

F /N =W sin α  / W cos α  = tan α

µ = tan α

α = tan -1 (θ ) = ϕ

Angle of repose = angle of friction .