GOLF BALLS

 

Most golf balls have between 300 and 500 dimples, which have an average depth of about 0.010 inch. The lift and drag forces on a golf ball are very sensitive to dimple depth; a depth change of 0.001 inch can produce a change to the ball's trajectory and the overall distance. Dimples have traditionally been spherical in shape, but it is possible to optimize the aerodynamic performance of other shapes, Callaway golf balls use hex shaped dimples. 

 

Having dimples is what helps with the drag on the ball, dimples create turbulence which sucks air to ball causing separation to be delayed therefore making the drag on the ball much less.