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While most balls used in sports have different sizes they all have smooth surfaces. However, golf balls have a pockmarked surface. The reason for this is to minimize air resistance and maximize the balls travelling distance. Pockmarked golf balls travel over twice as much than balls with smooth surfaces. Bumps cause turbulence in the front of the ball which causes the change of air flow to occur only on the back side. This allows the ball to travel further as the ball's resistance is decreased with less surface with low pressure.