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  #1  
Old 01-12-2006, 12:38 PM
Ted Ted is offline
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Question Karate breaks

Where could I find info about the physics of a karate break?

Why does the ice or cement break and not the hand...?
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Old 01-12-2006, 02:19 PM
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well, i dont think that karate people break cement with thier bare hands. mostly wooden boards. their hands dont break because wood is easier to break head on then the edge. and I think the bones in your fist are harder then wood boards that they use.
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Old 01-12-2006, 02:27 PM
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Default Wood

In Karate, they use special wood that is softer than normal. If they used normal wood, your hand would be injured. Also, they normally punch the wood, so their knuckles go through the wood first.
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Old 01-12-2006, 02:28 PM
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but sometimes they use thin normal wood
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Old 01-13-2006, 09:11 AM
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Good thoughts guys, but probably wrong...and no science.

If you don't think it can be done, where is the physics?
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Old 01-13-2006, 09:13 PM
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Take a look at this passage and see if it helps you...

"quoted from an old edition of the Guinness Book of Records

'The main problem for such records is that there are too much different bricks, wooden blocks etc. Maybe it is possible to define "standard bricks" used for a record. However, who can be sure that these "standard bricks" are still available 10 years later - in the U.S.A as well as in Australia, Russia or Japan? (But this would be essential for defining rules for accepted world records.)' "from [[url]http://www.recordholders.org/en/list/karate.html][/url]


Actually, it isn't too hard to develope an experiment from this. You can test how easy it is to break wooden boards of different length, or different wood, if you have the access. I actually would like to see if the length of the board would have an effect on how easy it is to break something. The thickness definitely matters. What about the width? Or what if you apply pressure at different parts of the board? Is the middle necessarily the most effective place? Seems like it. But why?

Just some ideas... Good luck!
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Old 01-14-2006, 09:46 AM
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Here we go...


Found something:

[url]http://www.elite-fighters.com/library/downloads/physics1.pdf[/url]


a pdf of a 1979 article in Scientific American that sceptics should read.


Thanks
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Old 01-14-2006, 05:08 PM
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Default i know!

only experienced experts brake it with there hand, beginers brake it with there elbow and foot. i know this, cuz im in it!
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Old 01-14-2006, 05:09 PM
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(and you dont use cement)!
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Old 01-17-2006, 09:45 PM
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you must know what part of your hand you are using to break the wooden board etc.
from what i know as a black belt in Tae Kwon Do
if u look at ur right hand u use the bottom left corner of your hand(the opposite side of your thumb) facing your hand at a 45 degrees higher from just straight this prevents your pinky finger or ne other fingers from getting injured.
and from what i can feel (hehe) i think that part of your hand is more harder than ne other parts on your hand. O yeah and like wat satfire said you must go through the board!!! for better strength
And now for the science part well in Newton's third law of motion it says if one object exerts a force on another object, then the second object exerts a force of equal magnitude in the opposite direction on the first object. well i think by going through the board might reduce this force reaction back onto your hand

o yeah and satfire not to say that your wrong or anything but
the woods i broke dont seem so soft lol thats my opinon after the pain
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