Here are some amazinging facts that occur during the golf swing.
1. During the downswing the shaft is flexing in various directions causing the club's length to actually shorten. A driver's length will shorten by approximately 1/4 ".
2. The elapsed time from the very top of the backswing to just before impact with the ball is approximately 1/5th of a second. During this short time the average male player will generate a clubhead speed of 90 to 100 MPH.
3. During impact the ball stays on the clubface for 5/10,000 of a second. During this time the ball travels a distance of 3/4 " to 1".
4. The maximum forced (energy applied to the ball) at impact approaches 2,000 pounds, or one ton and causes the ball to compress 15% to 30% of its original diameter.
5. The centrifugal force exerted downward and pulling on the golfer's hands at impact is the equivalent of 40 to 60 pounds.
6. Because of the time required for the impact to travel through the clubhead, up the shaft, into the golfer's hands and register with the brain, the golf ball is already 10" to 12" from the club face when the player feels the hit.