Great discussion going on over here....All have made such great points...now the hard part is translating it those students who have downstroke "blackout"
Pace in my mind is the direct relationship of the Hand Speed and the Surface Speed..I could be wrong and would stand to be corrected
Arc Velocity is surface speed
Arc Accleration is the result of the radius changing from smaller to larger
Angular Velocity is the rate of rotation of all components and their respective centers...in this case the radius in relation to clubhead travel controlled by #3 , Hand travel and turning rate of the pivot components
Angular Acceleration is the change in hand speed .....via the pivot or accumulators #4 and #1
Rhythm is the RPM roll of #3 and the turning rate of the pivot to maintain the same Angular velcocities or the rate of closure of the clubface, travel of the orbitng clubhead, to the selcted plane angle