A roller is made by joining together two cones at their vertices O. It is kept on two rails AB and
CD which are placed asymmetrically (see figure), with its axis perpendicular to CD and its centre
O at the centre of line joining AB and CD (see figure). It is given a light push so that it starts
rolling with its centre O moving parallel to CD in the direction shown. As it moves, the roller
will tend to move right, WHy(explain)?