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Post by gmbtempe on Feb 28, 2010 1:39:39 GMT -5
thanks,
Mike M always posts face on's on his page but never puts up down the line views.
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Post by imperfectgolfer on Mar 1, 2010 23:54:50 GMT -5
I just read this comment by Brian in his forum - quoting Aaron Zick as the "scientific expert".
"I was saying that Zick said that the FORCE WE CALL CENTRIFUGAL—the outward pull feeling of the clubhead—is as much caused by the golfer PULLING UPWARD ON THE GRIP as any body rotation."
Do you think that this possibility can even be remotely true?
In this thread, I have demonstrated that Jamie Sadlowski's club releases in the mid-downswing. If one presumes that Jamie is a swinger, and if one believes that the release of PA#2 is due to a centrifugal force, then that force must be operant in the mid-downswing and early part of the late downswing. Do you believe that a golfer is pulling upwards on the grip end of the club in the mid-downswing and early stages of the late downswing?
I believe that the only time a golfer pulls upwards on the grip end of the club is immediately pre-impact, but that is not where the club release process occurs in most swingers eg. Jamie Sadlowski, Tiger Woods and Ben Hogan. I think that Zick's theory would only be applicable to swingers who use a late snap release - the "cracking the whip" release maneuver.
Jeff.
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Post by jonnygrouville on Mar 2, 2010 2:56:04 GMT -5
This might just be terminology, as in 'centrifugal force' being an effect or a 'feeling' as the quote says, not a true force.
If you are spinning a weight on a string, there is tension in the string. You are effectively pulling. If you weren't, you would be letting go or being dragged in a straight line by the weight. This might be the 'pulling upward'.
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Post by imperfectgolfer on Mar 2, 2010 10:13:06 GMT -5
Jonny,
I don't think that the term CF can be used in an undefined manner as a "feeling".
A centripetal force is a force that pulls the orbiting ball on a string towards the center. However, the ball doesn't move in a straight line direction towards the center of a circle - it maintains a circular path at the end of a taut string. It's the CF counteracting the CP force that keeps the string taut. If there was no CF force, then the orbiting object would be pulled in a spiralling direction towards the center by the CP force. In other words, I think that a CF is constantly in play when an object moves in a circular manner.
Jeff.
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Post by jonnygrouville on Mar 2, 2010 21:45:24 GMT -5
A centripetal force is a force that pulls the orbiting ball on a string towards the center. However, the ball doesn't move in a straight line direction towards the center of a circle - it maintains a circular path at the end of a taut string. It's the CF counteracting the CP force that keeps the string taut. If there was no CF force, then the orbiting object would be pulled in a spiralling direction towards the center by the CP force. In other words, I think that a CF is constantly in play when an object moves in a circular manner. I agree and that is what I thought was behind the pulling comment in the original post - the tautness of the string. If the force is there constantly, as you say, it could be proposed that the golfer should effectively be constantly pulling on the golf club. In short, it sounds to me like a discussion of academic definitions or semantics as opposed to being something that can directly help anyone play golf.
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Post by imperfectgolfer on Mar 2, 2010 21:58:44 GMT -5
A golfer is constantly pulling on the club if he uses a drag-loading technique (swinging). The left hand moves in a U-shaped arc, and its vectoral direction-of-pull can theoretically be divided into two vectoral force components. A linear-force vectoral component (force A) that moves the hands in a straight line direction and a CP-force vectoral component (force B) that moves the hands towards the center of an imaginary circle. If force A is greater than force B, then the U-shaped hand arc becomes "straightish" and if force B is greater than force A, then the U-shaped hand arc becomes more circular.
Jeff.
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