Hey! (First post) We're conducting an experiment as a part of a couple of problem sets in preperation for the IYPT, and we're a little stuck in terms of the research we need to have to solve the problem. Basically, (I'm not going to copy paste the question in here, I'd be cheating) We've identified that most of it requires knowledge of fluid mech. In short the question asks the effect of fluid inside a ping-pong ball when it bounces. Anything you can reccomend I read up on or work/brush up on before I get started on the theory work?