Speed, Energy, Momentum, Power
in
Downswing

Color code for figures below:    blue → clubhead,    red → arm,    brown → shaft.
Red vertical dashed lines delimit time span in graphs where arms decelerate, ie., slow down.

Before the bad weeds start to take root let's put forward correct information. The arms in the down stroke, prior to impact, slow down. Fig 1 gives a clear view where this takes place. The corresponding time intervals in Figs 2, 3, 4, and 5 are indicated with the two red vertical dashed lines.

Fig 2 shows the speed of the distal ends of segment one and two. These are the hands and the clubhead in golf speak. Notice when the arm slows down that the clubhead more rapidly increases its speed.

Figs 3 and 4 show the angular momentum and the kinetic energy of respectively the arm, shaft and clubhead. Notice that angular momentum and kinetic energy have a very similar behavior. They clearly indicate that momentum/energy is flowing from the arms to clubshaft/head.

Fig 5 show the power for the arm, shaft and clubhead. Notice that the power for the arm gets negative hence indicating again that it is losing energy - flowing away from it and towards the clubshaft/head.

Beyond impact there is a reverse flow - clubhead/shaft restituting kinetic energy/angular momentum again back to the arms.

mandrin