Three identical steel balls, each of mass m, are placed in a cylindrical ring which rests on a horizontal surface and whose height is slightly greater than the radius of the balls. The diameter of the ring is such that the balls are virtually touching one another. A fourth identical ball is then placed on top of the other three. Determine the force, P, exerted by the ring on each of the three lower balls.
Three balls are kept together by a ring with a fourth ball on top, the force exerted by the ring on three lower balls are calculated.