Why do golf balls have "dimples"?
The resistance force that slows a flying ball is caused by the air friction and something called turbulence. Air turbulences contain whirlwinds that consume the ball's kinetic energy, slowing it down. A ball with a smooth surface creates a large zone of turbulence behind it during the flight, causing it serious energy loss.
The "dimples" make the air flow around the ball to be uneven. This way, the moving air around the ball adheres to a larger surface before detaching. In result, the turbulence zone is narrowed and the air resistance is reduced.
At golf, the uneven distribution of the "dimples" is forbidden, even though these would make the ball travel even further through air.
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