Re: Punching
- From: "cnctut" <cnctutwiler@xxxxxxxxxxxxx>
- Date: 13 Jun 2005 11:29:03 -0700
Mark Fergerson wrote:
> RichD wrote:
> > This question came up on a martial arts list.
> >
> > You want to perform the standard right hand punch (with left foot
> > forward), as powerfully as possible.
>
> First consider what you mean by "power". You posted to
> sci.physics, so let's get dimensionally analytical.
>
> P=M/LT^3, which can be broken down into mass accelerating over a
> time period.
>
> A punch is basically applying your fist moving at some velocity
> to some part of an opponent's anatomy which will absorb the kinetic
> energy by deforming, thus decelerating your fist. Generally you want
> to maximize contact velocity and minimize dwell time, no?
>
> You pose two scenarios with one major difference; the relative
> velocity between you and your opponent. In the second, you have to
> deal with the attacker's momentum; after a successful strike you
> don't want him knocking you down. So you have some options; you can
> plan on ducking aside and letting him go past you, you can redirect
> him so he goes past you, or you can stop him WRT you. ISTM that what
> you do with your feet depends on your choice.
>
> To stop him cold, you want to put your fist in front of his
> center of mass (in Aikido it's called the One Point, located about
> three fingers above the navel and two inches "inward") and brace
> yourself firmly enough to absorb all his momentum which seems to
> imply not lifting your rear foot at all. Then you have to deal with
> a body folded over your fist. ;>)
>
> > We consider two different
> > stances: right foot flat (pushing off the heel), or rising onto the
> > ball of the right foot.
> >
> > Now imagine two scenarios:
> > a) You are attacking the opponent. The consensus is that rising is
> > superior, because it brings the calf muscles into play. Also, the
> > posture offers greater leverage (and reach).
>
> If I'm going to punch someone, I like to use Bruce Lee's Jeet
> Kune Do style; left foot flat, right foot semi-on-the-ball. OK,
> mainly because to opponent, it looks counterintuitive. But being
> lazy, I don't like to punch. If Uncle Al's solution isn't available
> I fall back on Aikido and wait for him hand me something to hurt him
> with.
>
> > b) Opponent is running toward you, probably to attempt a football
> > type tackle. Now some argue that heel down is preferable, because you
> > get a sturdier base (in the asian styles, they call this 'drawing
> > power from the earth'), and you really want to impale him, rather
> > than strike in the usual sense.
> >
> > Now I argue that (b) should have the same solution as (a), using a
> > relativity argument. I.e. Force is force, momentum is momentum,
> > and the only that matters is relative motion; if (a) is stronger, it
> > should be stronger whether the opponent is standing still or in motion.
> >
> > Thoughts? Is this debate amenable to physics analysis, or only
> > empirically?
>
> The fact that we aren't rigid bodies does complicate things a
> tad, but much of physics is about masses in motion.
>
> Mark L. Fergerson
Mark--I agree with your assesment--if someone were running at RichD I
might suggest a safe kick to the target area you discribe. Side kick
comes to mind--stops agressors momentum--brings the next target, his
face, down to the perfect level for a KO front punch--assuming you
don't kick him to low and have his stomach wrap around your foot. ;-))
Tut
.
- References:
- Punching
- From: RichD
- Re: Punching
- From: Mark Fergerson
- Punching
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