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Conservation of Angular Momentum . . .

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Old 10-11-2006, 12:39 AM
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Originally Posted by ThinkingPlus
You're killin me. Basically, lag is a consequence of Newton's 1st law: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. As you start the club back (overcoming inertia - bonus points in this discussion and probably a Nobel prize if you can give definitive explanation why mass exhibits inertia ) you impart momentum to the club, i.e., put it in motion. When it is time to start the downswing, this motion must be overcome with a force to get the club moving downplane towards our dimpled friend (the ball, not Bucket's Behind). When that force is applied, one feels lag pressure. As long as that force is continually applied, the lag pressure will remain. Lag pressure maintained through impact will result in a collision that is more inelastic (less lossy) than if one had a clubhead moving with a constant velocity (my assertion, et al.).
Once again, I probably am not providing the answers folks are looking for. Sorry if that is the case.
PERFECT! Thus . . . SUSTAIN the the LAG not INCREASE the LAG. Now what do you say about "lag is a consequence of Newton's 1st law: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it." . . . for a Hitter. If we have applied thrust via the turning of our body (phat donkey and all) . . . AND THEN one's Right Tricepts takes over have we annulled "the conservation of angular momentum" as a result? Would you say the Physics are different as a result of the Right Arm supplying the "thrust" or "acceleration" or whatever?

How'd you know my hiney had dimples? Beware "Killing me." Mikey is LURKING. He forgets his medication sometimes.
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Old 10-11-2006, 01:53 AM
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Old 10-11-2006, 08:52 AM
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Force is Force
Originally Posted by 12 piece bucket
PERFECT! Thus . . . SUSTAIN the the LAG not INCREASE the LAG. Now what do you say about "lag is a consequence of Newton's 1st law: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it." . . . for a Hitter. If we have applied thrust via the turning of our body (phat donkey and all) . . . AND THEN one's Right Tricepts takes over have we annulled "the conservation of angular momentum" as a result? Would you say the Physics are different as a result of the Right Arm supplying the "thrust" or "acceleration" or whatever?

How'd you know my hiney had dimples? Beware "Killing me." Mikey is LURKING. He forgets his medication sometimes.
Applied force is applied force. As long as the lag pressure is felt at PP3 throughout the down (out and forward) stroke, then the Hitter is still applying force. However, if one plotted lag pressure vs. time during the down stroke, then one might see variation as different components dominate as the force appliers.

Actually, some of the more advanced swing analysis places measure and plot clubhead acceleration during the golf stroke. It is an eye opening and humble experience. The Titleist Performance Center folks probably do it. Don't forget, acceleration makes the world go round.
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Old 10-11-2006, 09:13 AM
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Originally Posted by ThinkingPlus
Applied force is applied force. As long as the lag pressure is felt at PP3 throughout the down (out and forward) stroke, then the Hitter is still applying force. However, if one plotted lag pressure vs. time during the down stroke, then one might see variation as different components dominate as the force appliers.

Actually, some of the more advanced swing analysis places measure and plot clubhead acceleration during the golf stroke. It is an eye opening and humble experience. The Titleist Performance Center folks probably do it. Don't forget, acceleration makes the world go round.
Witcha . . . but . . . is the force that the Hitter applies the same as Angular Momentum? Or is he overriding it as a result of trying to thrust in a straight line?

Thanks for bearing with me . . . there were some cousins who "got together" in my lineage.
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Old 10-11-2006, 10:05 AM
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Cause vs Effect
Originally Posted by 12 piece bucket
Witcha . . . but . . . is the force that the Hitter applies the same as Angular Momentum? Or is he overriding it as a result of trying to thrust in a straight line?

Thanks for bearing with me . . . there were some cousins who "got together" in my lineage.
Force is cause. Applying force results in movement. Angular momentum is effect. Mass moving about a fixed point has angular momentum. Applying force (cause) results in the club acquiring angular momentum (effect).

Closely related family members "getting together" (cause) results in (somewhere along the family tree or evolutionary tree - your pick) Bucket (effect). See you already understood the concept, but just had not applied it to the physics (wasn't this easy)!
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Old 10-11-2006, 01:14 PM
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Merry-Go-Round -- Push or Pull
Originally Posted by ThinkingPlus
Originally Posted by 12 piece bucket

Witcha . . . but . . . is the force that the Hitter applies the same as Angular Momentum? Or is he overriding it as a result of trying to thrust in a straight line?

Force is cause. Applying force results in movement. Angular momentum is effect. Mass moving about a fixed point has angular momentum. Applying force (cause) results in the club acquiring angular momentum (effect).
Very nice, Steph. That concise explanation helps us all.

Bucket, with Steph's description in mind, think of pushing a playground merry-go-round into its rotating motion. The straight line thrust (force) causes the merry-go-round (the mass rotating about a fixed point) to acquire its rotating motion (and hence its angular momentum).

The straight-line 'push' is against the centripetal force of the merry-go-round's fixed structure, and as a G.O.L.F. analogy, is a Hitting Motion.

Similarly, the identical angular momentum could be created by turning the axis of the merry-go-round, thereby inducing a centrifugal force and its 'pull'. This is analagous to the Swinging Motion.
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