How does a ball swing???

Well, I am quite sure on this on. I saw it on Ten Sports in a 10 minute programme called "the tricks of the trade". In that programme they tell you about bats, batting, wicket-keeping, bowls and bowling. They told that in reverse swing the side which shiny is the heavier side ( because it has all the liquids absorbed) and the rough one is the lighter side of the ball (the seam joins the 2 parts together). So, when the shiny side is ouside, i.e. on the left, the momentum takes the ball to the left, i.e. towards the side of the shiny side and when it is inside, the ball moves in. There is also the degree (angle between the arm and the body) factor. Here is a wonderful link that explains it all- www.wikihow.com/Reverse-Swing-a-Cricket-Ball

I thought it was to do with Bernoulli's principle, the weight distribution of the ball, the roughness and the seam angle along with some extra-terrestrial intervention that makes it swing. I may be wrong about the extra-terrestrial stuff, but the rest must be true!!

the team makes one side of the ball rough....it is known that air is a fluid and there fore the force of bouyancy acts on it...this makes the ball move either side ways after pitching or even in the air....shane warne can do the latter one perfectly...

I think the force of gravity makes the ball to swing. The movement of air also can do so.

It is something to do with the surface of the ball....whther it is rough or smooth....so that the ball in the air ....pressure variation makes the ball to swing.....probably...!!!