How does a spitball effect the flight of a baseball?
What kinds of substances can you put on a baseball to make it a spitter?
Why are they illegal?
Because of the forces involved in a curve ball, Magnus force, the
rotation of a "spit ball" becomes quite unpredictable and dangerous to
the batter-hence they are illegal. For a detailed description of the
forces go the book on the Physics of Baseball by ???, forgot his name
but he is from Yale's Physics Department.
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Update: June 2012