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Conservation of Momentum


Posted by: Dr. Yeager (yeagercw@hotmail.com) on Wed Feb 2 19:50:19 2005


Jack,

It seems to me that you are an honorable person. I am sure you have the best of intentions and I hope that you have helped hitters improve.

I am impressed with the time and effort you put into responding to questions asked on this board. It shows that you have strong concern for those asking questions or making comments.

I have found, however, that you have made numerous irresponsible (using my words outside of their literal form/ speaking for me) as well as illogical (quantum leaps made on the whip analogy) statements.

I MADE COMMENTS ON >>>YOUR “WHIP” POSTS <<< IN MY LAST MESSAGE. Jack, HERE ARE THREE MORE IRRESPONSIBLE/ ILLOGICAL POSTS THAT YOU MADE ABOUT MY POSITIONS:
1. Mankin> “From your statement above, I would say we (Dr. Yeager included) are now in agreement. It appears we agree that the mechanics used to crack a whip do not represent mechanics used to swing a bat.”

This statement seems to suggest the laughable notion that the three of us had some sort of communication during which we were made to see things your way.

I have NEVER said that one should use the same mechanics to swing a bat that he or she uses to crack a bullwhip (Another huge leap that I have not previously encountered).

I HAVE said that the human body and a bullwhip transfer momentum in SIMILAR fashions and that the batter should work to maximize body segment separation AND COORDINATION in order to maximize the conservation of momentum or whip effect.


You follow that statement with this:
2. Mankin> “It also appears we agree there is a kinetic chain that rotates the shoulders from the ground up.”

Again you attempt to lump me in with you as if we have ever communicated.
Also, are you aware that this “Kinetic Chain” that you speak of has two parts:
A. Elastic Reflex
B. CONSERVATION OF MOMENTUM! A.K.A. (by some) as the WHIP EFFECT!
HUH??????????????????????????????????????????????????????????????????????????????????????


And JACK also wrote:
3. Mankin> “Also keep in mind that a bat can not uncoil down its length when the hands stop like a bullwhip.”

WOW!!????? Sir Isaac Newton just rolled over in his grave.
The conservation of momentum occurs between all interacting objects, not just whips!!!
(Rifle and bullet) (Cue ball and 8 ball)
Within a defined system, momentum is ALWAYS CONSERVED..NO EXEPTIONS…


I do believe that the muscles of back leg push the batter’s center of mass forward. This forward momentum is blocked and transferred up the kinetic chain by a flexed lead leg.

If you would like to dispute this go right ahead. I have no problem with any disagreement with my positions.

I could not care any less if you believe in the conservation of momentum, a forward movement by the body’s center of mass or if Earth revolves around the Sun>>>>>nor do I want to debate our hitting philosophies.

I would simply appreciate it if my statements would remain in their original context and that outlandish assumptions about my teachings would not be made.

If you or anyone would like any CLARIFICATION of my positions, I can be reached at yeagercw@hotmail.com. I am available to talk on the phone as well – just email and conversation can be arranged. I will do my best to avoid airing out dirty laundry on these boards.

Jack, I do wish you well.

Take care,

Chris Yeager, PHD, CSCS


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