Math and physics explain the anguish of a golf ball that zings around the rim of the hole instead of falling in.
A "lip out" occurs when a golfer putts a ball, and it swings around the rim of the hole before escaping again.
For the putt to succeed, the angular momentum of the ball pitching down into the hole must overcome the angular momentum of it rotating around the hole's rim.
Researchers report their findings in Royal Society Open Science.
Author's summary: Math explains golf mishaps.