PaulMarch wrote:Folks:

Noting up front that Dr. Woodward prefers "Mach-Effect" (M-E) instead of the "Woodward-Effect" descriptor of his discovery, you folks haven't asked WHY should a time rate of change of internal energy combined with the bulk acceleration of the energy storing media create the M-E's posited inertial mass variations in the first place. Woodward merely points to the M-E’s math derivation and indicates that is what the math says ought to happen and then experimentally looks for the predicted inertial mass variation effects and goes from there. Jim does provide though a two dimensional analog in his book of an accelerated mass that creates “Kinks” in the ambient cosmological gravitational (g) field that somehow transiently shields the local accelerated mass from the cumulative inertial effects of the cosmological g-field and that transient shielding effect is what gives rise to the accelerated mass’s inertial mass fluctuations. I could buy that if the M-E didn’t have one other requirement that leads to some very strange predictions.

Woodward also posits that due to the fact that inertial reaction forces apparently occur instantaneously, (I can’t find any experiments that have directly measured this assumption.), that the M-E's posited gravitational effects with the mostly distant mass-energy in the causally connected universe that give rise to the M-E have to interact effectively in no-time. I.e. it’s Einstein’s famous “Spooky action at a distance” problem. And IMO it is a problem in this regard, for how does an instantaneous g-field interaction in spacetime, TRANSIENTLY shield a locally accelerated mass from the rest of the cosmological g-field? It would be nice if Dr. Woodward could explain to us how instantaneous g-field like Wheeler/Feynman radiation reaction forces can give rise to transient effects that take time to occur in the local laboratory frame of reference.

Best,

PaulMarch wrote:This is Woodward's reply to my previous question:

"Paul,

So you've become a critic after all these years? The answer to your question is on page 262 of the book.

The instantaneity of inertial reaction forces simply means that whenever something is pushed, the reaction force on it appears instantaneously. So if the thing pushed is extended, but rigid, there are no Mach effects (as explained repeatedly in Chapter 3 of the book) because the acceleration and reaction takes place simlutaneously throughout the body. But when an extended body does not react rigidly (and it absorbs internal energy), the effective mass of the body during the acceleration becomes a function of time, and the math of Chapter 3 follows in an elementary fashion.

You may want to review Chapter 2 as well, where the action-at-a-distance character of inertial forces is explained.

Best,

Jim"