05-10-2002, 01:42 PM
What happens with a baseball is that the threads cause turbulance on the outside of the pitch and cause lift to the inside thus causing the ball to curve inside. See if you can find a book called "Newton and the Curveball". A great compilantion of essays on modern day physics. (Includes a study on why dart throwers throw better after a couple of beers when the opposite should be true.)