A hemispherical bowl of radius R is rotated about it's axis of symmetry which is kept vertical.Asmall block is kept in the bowl at a position where the radius makes an angle theta with the vertical.The block rotates with the bowl without slipping .The friction coefficient between the block and the bowl surface is w[muu].Find the range of the angular speed for which the block will not slip.
I do not want the answer .I just want to know the direction of friction in minimum angular speed and maximum angular speed.I think that they should be opposite in direction.What do you say,friends?