• The USGA research and test Center tests more than 20,000 golf balls every year.
• An approved golf ball can weigh no more than 1.620 ounces. There is no minimum.
• The Minimum size for a golf ball is 1.68 inches in diameter. There is no maximum.
• Impact time (while the clubface and golf ball remain in contact) is 450 millionths of a second.
• In the time is takes to blink (1/10 of a second) more than 200 impacts could take place.
• The initial velocity of a ball changes approximately 1/2 foot per second for every 10 degrees Fahrenheit change in ball temperature.
• The spin rate of a golf ball when hit by a driver is approximately 3600 revolutions per minute.
• When hit by a wedge, the spin rate is approximately 8000 rpm.
  

True or False...

• A smooth ball will go as far as a dimpled ball.
  FALSE. Under similar launch conditions, a smooth ball will carry only 120 yards compared to a dimpled ball which will carry 260 yards.
  
  
• A smooth ball travels through the air with less resistance than a dimpled ball.
  FALSE. The dimples actually create a condition which reduces the drag resistance at speed normally experienced by a golf ball in flight.
  
  
• All balls are launched with a back spin.
  TRUE. Except for some negative-loft putters, all balls are launched with a backspin under normal conditions.
  
  
• A ball is in contact with the face of a driver longer than a putter.
  FALSE. For normal putts, the velocity of the clubhead is less than that of a driver, so the ball does not rebound from the face of the putter as rapidly as a driver.
  
  
  

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