1. The problem statement, all variables and given/known data a ball with a mass of 50 grams is placed inside a circular bowl with a radius of 10cm. the bowl rotates at a rate of 5 hertz what is the height in cms the ball will rise within the bowl? 2. Relevant equations Fr = m*w^2/r [tex]\sum[/tex]F = ma 3. The attempt at a solution well the solution is pretty obvious to me; since we are talking about max height then Fnety = 0 hence N*cosa = mg and N*sina = m * w^2/r. the problem is I don't understand why the ball would move at all, what force is the bowl exerting on the ball? there is no mention of friction and the ball initially has no inertia of it's own, how does the spinning bowl effect it without friction?