Re: Punching
- From: glhansen@xxxxxxxxxxxxxxxxxxxxx (Gregory L. Hansen)
- Date: Mon, 13 Jun 2005 01:37:26 +0000 (UTC)
In article <1118617669.227055.277400@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
RichD <r_delaney2001@xxxxxxxxx> 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. 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).
>
>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?
I'm assuming that you just want to hit the guy hard, and you're not
worried, for instance, that he'd take the punch and run into you.
In that case, you are correct, and for the reason you gave.
You can see the difference between force and power on the heavy bag. It's
easy to push the bag and give it a big swing, transferring a lot of
momentum=F*t to it. But that's not what knocks someone out. What knocks
someone out is the "pop" of a fast punch that causes the bag to jump and
fold, even if it doesn't swing very far. Impressive if caught by a camera
at the right moment. If you're just making the bag swing, you're not
hitting very hard. "Impaling" the onrushing attacker is drawing force,
not power, from the earth.
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.
- References:
- Punching
- From: RichD
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