Question

the mud particles sticking on the rim of the bicycle wheel leave the rim of the wheel tangentally. when starts moving explain

Answer 1

this is because of inertia of direction..for this purpose mudguards are applied to the wheels of the car so that the mud do not spoil the clothes of passerby..

Answer 2

IT IS DUE TO INERTIA OF DIRECTION.THE  TENDENCY OF A BODY TO STAY IN ITS STATE OF MOTION IS CALLED INERTIA.SO WHEN THE TYRE STARTS MOVING THE PARTICLES WILL HAVE A TENDENCY TO MOVE TANGENTIALLY(ANY OBJECT MOVING IN A CIRCULAR PATH HAS A TENDENCY TO ,MOVE IN A STRAIGHT LINE IN THE DIRECTION OF ROTATION).SO THE PARTICLES LEAVE THE RIM ,TANGENTIALLY  WHEN THE TYRE MOVES.IN ORDER TO PREVENT MUD FROM DISTRACTION U MUDFLAP ARE USED.
I HOPE THIS HELPS U...