Hi guys, I've been having this debate with various snooker players for christ knows how long, and with no physisists amoungst us, the problem's never been resolved.. Please Help! If check side (hitting the right hand side of the ball onto the right hand side cussion) is used when striking the cue ball, the cue ball returns from the cussion at a small angle than if hitting the centre. This means the ball could return at 90 degrees to the cussion when initially hitting the ball at an angle. So, given the situation below, where ball A is snookered from hitting ball B: B I O I I I I O I I I I O I A X Would check side allow more of the cussion (X) to be hit than if striking the centre of ball A or the left hand side of ball A. I would've like to create a computer simulation of this, however finding the mathematics behind spin and friction proved a tricky problem. Also I might add, is there an angle at which side spin no longer takes significant effect due to the lack of horizontal force and increase of forward motion against the cussion. If anyone has any opinions they really will be greatly appreciated as we've all driven each other mad it seems every time we go for a game of snooker! Cheers for reading!