F f mg Fc = f2 + N2 √ Since maximum value of frictional force is Limiting frictional force (µsN) Therefore maximum value of contact force is Fc(max) = (µsN) 2 + N2 √ or, Fc(max) = N√ µs 2 + 12 or, Fc(max) = N√ µs 2 + 1 Angle of Friction The angle between the resultant contact force (of normal reaction and friction) and the – normal reaction is known as the angle of friction. Tan = f  Fc N N F or, = Tan-1 f  N  f or, max = Tan-1 f max  N or,  max = Tan-1 µsN
F f mg Fc = √ f2 + N2 Since maximum value of frictional force is Limiting frictional force (µsN) Therefore maximum value of contact force is Fc(max) = √ (µsN) 2 + N2 or, Fc(max) = N√ µs 2 + 12 or, Fc(max) = N√ µs 2 + 1 Angle of Friction – The angle between the resultant contact force (of normal reaction and friction) and the normal reaction is known as the angle of friction. Tan  = f Fc N N F or,  = Tan-1 f N  f or,  max = Tan-1 f max N or,  max = Tan-1 µsN