To understand a person's viewpoint, I need very simple explanations where every sentence is well-defined in terms of definitions and concepts, and where all the sentences are carefully connected so as to finally produce a coherent storyline.
Here is a photo of a golfer's clubhead swingarc.
One can see that the clubshaft/clubhead moves down-and-out-and forwards along a circular arc in the downswing. Therefore, the forces needed to move the clubhead need to achieve two goals from an energy perspective - i) move the clubshead at a finite speed in space and ii) move the clubhead in a circular arc (which is equivalent to supplying the clubhead with centripetal acceleration while it is traveling at its finite speed).
I would like to see Bernt use that simple model to describe the forces needed, and their mechanism of energy storage and release.
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