Caveat: I'm not a teaching pro, physicist or physical trainer, the presentation below is my understanding of the misnamed so called CONCEPT presented as balance. This is presented for further discussion & learning on the concept. Please feel free to cordially & respectfully point out my errors in the spirit of creating enhanced understanding of the golf swing.
I think calling the motion as "balance", "static balance" or "dynamic balance" is linguistically counterintuitive. It's actually "momentum management" of Newtons 3rd law. Like so many actions in golf the english language is found wanting & incapable in description. The definition of balance defined by physics:
"If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced. An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction."
For instance the pendulum of the metronome is in balance as it tic-tocks back & forth while the golf swing is temporarily triangular; "down, out & forward", exerting unbalanced uneven forces. There is no balance static or even dynamic, unless your misreferencing the ability to remain standing upright as some form of balance while the forces of momentum & inertia push against themselves in disequalibrium, but there is one caveat in Physics to create temporary equalibrium in a flexible movement such as the golf swing.
Triangle of Forces
Three forces are in equilibrium if they can be arranged to form a triangle.
Ben Hogan's Magical (Triangle) Device
However there are even problems that must be resolved with the physics of the triangle of forces, as the body is not rigid but flexible, hence the forces that power the triangle are not & never will be equal. Secondly the static triangle is interupted & breaks down in various sequences of the swing (rt arm in take away & right arm folding @ P3 to P4). And also the triangle must be recovered from P4 to P5.
It must be noted that Jim Waldens "Arm Swing Illusion" is absolutely correct as it begins in creating the triangle pushing forces away from the center mass to create it. The right arm must be initiated above the left arm in the quasi triangle to allow for its folding. Thus when initiating the swing sequence it is not mechanically constructed equally in balance per say, as the right arm of the triangle becomes shorter than the left. If the triangle was in balance, the hands would both meet equally with equal pressure & length at the apex of the shaft grip. But the unequal construction of the body & hand placement on the grip prevents the perfect mechanical triangle from forming. Thus from the initiation of the set up the player must begin compensating for the imbalances & disequalibriums of forces that will ultimately result in the imperfect triangle operating out of balance. These compensations in the golf world are erroneously known & called "swing flaws". Some of these compensations are called rythm & tempo, etc., which are induced as a glue to prevent & nominalize the effects of disharmonization that occurs mechanically.
A complete industry is built upon these disequalibriums & imbalances, which are essentially using natural means of manipulating the body to react to the forces of momentum, disequalibrium & imbalance. Terms such hips forward, weight shifting, hands in front, head behind @ impact etc., etc. etc. are compensatory moves that allow the triangle to exert maximum forces against the ball while remaining on your feet. This does not fit the description in physics as balance, but something altogether different & it does not allow for the entropy that also developes as the triangles chain of events move from position to position.
IMO, based upon the foregoing the word describing the forces acting on the club head & the body are not accurate & therefore cause & create general misunderstandings of the information conveyed to the student or player.
Its nonsense to think that you will remain in balance when the right is employed to throw the club at the ball. In fact its physically impossible. That said the momentum, inertia & unbalancing can however be managed to advantage.
Edited by Switter, 22 April 2017 - 08:10 AM.