Bat Speed -- Baseball Hitting Forum

Posted by: Jack Mankin (MrBatspeed@aol.com) on Sun Jan 20 17:02:58 2008

>>> Agree but disagree.

The momentum does not go to zero before weight shift.

The momentum becomes predominantly rotational before "go". Bonds and Williams are opening their hips from the time coil turns to uncoil....and that happens without pause. <<<

Hi Teacherman

You really need to study the information in the links below before continuing. The laws of physics that govern linear momentum (p=mv -- our present discussion) are very different from those that govern angular momentum (L= r x p).

With linear momentum, momentum approaches zero as velocity approaches zero.
With angular momentum, momentum approaches zero as the angular displacement rate approaches zero.

Teacherman, whether or not his hips are rotating, has no bearing on Bonds' linear momentum (p=mv). As an example, a stationary gyro can rotate at a very high RPM and have zero linear momentum.

Linear Momentum

Angular Momentum

Jack Mankin

Followups:

Re: Re: Re: Re: Re: Re: Weight Shift - Truism Not Fallacy Teacherman [ Tue Jan 22 16:02:50 2008 ]
Re: Re: Re: Re: Re: Re: Weight Shift - Truism Not Fallacy tom.guerry [ Mon Jan 21 15:40:41 2008 ]

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Text:

> >>> Agree but disagree.
> 
> The momentum does not go to zero before weight shift.
> 
> The momentum becomes predominantly rotational before "go". Bonds and Williams are opening their hips from the time coil turns to uncoil....and that happens without pause. <<<
> 
> Hi Teacherman
> 
> You really need to study the information in the links below before continuing. The laws of physics that govern linear momentum (p=mv -- our present discussion) are very different from those that govern angular momentum (L= r x p).
> 
> With linear momentum, momentum approaches zero as velocity approaches zero.
> With angular momentum, momentum approaches zero as the angular displacement rate approaches zero.
> 
> Teacherman, whether or not his hips are rotating, has no bearing on Bonds' linear momentum (p=mv). As an example, a stationary gyro can rotate at a very high RPM and have zero linear momentum.
> 
> <a href="  http://id.mind.net/~zona/mstm/physics/mechanics/momentum/momentum.html">Linear Momentum</a 
> 
> 
> <a href="http://en.wikipedia.org/wiki/Angular_momentum">Angular Momentum</a –
> 
> 
> Jack Mankin

Anti-Spambot Question:

This is known as hitting for the cycle in a game?
   Single, double, triple, homerun
   Four singles
   Three homeruns
   Three stikeouts