Why centripetal force is not considered in fbd of funnel question in lecture 3 at 15:00 minutes of Circular Motion of class 11th Physics while in other questions of different topic where solved in Non inertial frame, the centripetal force in addition to centrifugal (pseudo force)is also considered. Please also explain what/where is centripetal force in this question? pic is not getting uploaded. pleas go though video lecture..