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Not being a scientist I can't really go into a lot of detail but friction from the wind/air causes a scuffed ball to have more movement than a ball that is smooth. More movement of the ball would be an advantage to the pitcher.
Ball boys rub the footballs so the footballs have better grip and to make more comfortable to play with. It warms the football up and is easier to catch and hold on to. Also, in the rain the ball boys rub them with a towel to dry them off. In the winter, they rub them because if you dont rub them the feel like you're catching a rock.
because it adds grip to the baseball and the pitchers want a dark mudded baseball so the batter can not hit the ball.
^ This is partially true, the mud is rubbed on the ball to take its shine off and make it easier to grip. It has nothing to do with the pitcher wanting the ball to be dark so the batter cant hit it. The type of mud has a sandpaper texture and Lena Blackburne rubbing mud is the only type used by the MLB.
Yes. The baseballs are rubbed down by the umpires to take the sheen off the ball . Lena Blackbourne's Rubbing Mud has been used since 1938, and is still used today in Major League Baseball. There is even a can of this mud on display at the Baseball Hall of Fame in Cooperstown, New York. The place where the mud is found in New Jersey is still a well kept secret.
It helps with grip by drying the hands that may have executive moisture do to sweating. Most players today use batting gloves for better grip.