Consider a ball rolling around in a circular path on the inner surface of a cone. The weight of the ball is shown by the vector W. Without friction, only one other force acts on the ball-a normal force.
(a) Draw in the vector for the normal force. (The length of the vector depends on the next step, b.)
(b) Using the parallelogram rule, show that the resultant of the two vectors is along the radial direction of the balls circular path. (Yes, the normal is appreciably larger than the weight!)