Me and one of my practice mentors always have these controversial "physics like" debates in pool. The latest one was can two frozen balls be thrown differently on clean vs dirty cloth. His answer was basically "absolutely not" As we discussed it more, he brought to my attention that the old knowledge was that when frozen balls are thrown, they slide for one split second together and then split apart. The "new high speed camera" knowledge is that they get "instantly" (is anything instant on a pool table) thrown from the friction of the two balls and cloth has no effect on the shot. Now if they do slide for that split second then my debate is that on dirty cloth they will slide less therefore keeping closer to the original intended throw angle and on clean cloth they will slide more before energy is reached object ball thrown, brand new balls, brand new cloth, maybe the slide can be seen. I guess in the end whats most important is just knowing how the balls will react and not the why.