Why are their dimples on a golf ball?

Question

Why are their dimples on a golf ball?

Answer 1

Because dimples are so cute.

Answer 2

A ball moving through air experiences two major aerodynamic forces, lift and drag. Dimpled balls fly farther than non-dimpled balls due to the combination of two effects:

Firstly, the dimples delay separation of the boundary layer from the ball. Early separation, as seen on a smooth sphere, causes significant wake turbulence, the principal cause of drag. The separation delay caused by the dimples therefore reduces this wake turbulence, and hence the drag.

Secondly, backspin generates lift by deforming the airflow around the ball, in a similar manner to an airplane wing. This is called the Magnus effect. Backspin is imparted in almost every shot due to the golf club's loft (i.e. angle between the clubface and a vertical plane). A backspinning ball experiences an upward lift force which makes it fly higher and longer than a ball without spin.[1] Sidespin occurs when the clubface is not aligned perpendicularly to the direction of swing, leading to a lift force that makes the ball curve to one side or the other. Unfortunately the dimples magnify this effect as well as the more desirable upward lift derived from pure backspin. (Some dimple designs are claimed to reduce sidespin effects.)

Answer 3

They convert spin into lift.  Check out this article.  I hope this answers your question.  http://www.leaderboard.com/WHYDIMPS.htm

Answer 4

when the golf ball is hit with a bit of backspin the dimples create a pocket of air underneath it. this causes a higher pressure area underneath the ball. the high pressure moves to the low pressure above creating lift.