1. The problem statement, all variables and given/known data A 100 g puck is attached by a length of string to a 500 g block of ice. The string passes through a hole in the centre of a horizontal, frictionless table, and, because it is revolving in a circle of radius 20 cm, the puck is able to support the ice. (Refer to attachment for pic) 2. Relevant equations None. 3. The attempt at a solution I didnt understand this scenario as the whole question was weird. I dont understand how a puck can spin, without being dragged through the centre by the ice cube, since it weighs more and will thus pull puck down. How can this be a momentum problem even if nothing is colliding?