White's analysis is the first to consider wrist-cock angle. His model is also very simple in a Physics 101 kind of way, explaining the mechanics of the golf swing in terms of the club's changing moment of inertia. These two points distinguish his work from similar analyses by C.B. Daish1 and the late University of Nebraska physicist Theodore Jorgensen2.
White shows that the energy and momentum of the arm-club system are redistributed during the swing as a direct result of the uncocking of the wrists that takes place before the club strikes the ball.
“As the wrists uncock near the bottom of the swing, the club head and the hands are moving in different directions, which means the club pulls against the hands and slows them down,” White said. “This means, in turn, that the kinetic energy in the shoulders and arms is transferred to the club. Without wrist-cock, most of the kinetic energy stays in the arms and shoulders and the swing is inefficient. Best of all, the golfer does not have to do any extra work to make the transfer happen.” Thus, wrist-cock is the make-or-break factor in a good golf swing.