How a karete player breaks a slab of ice with a single blow?
Answer:
A karate playeer strikes a slab of ice with his hand in very short interval of time. In doing so, the entire momentum of the hand is reduced to zero in very short interval of time. As a result, very large force delivered to the pile of tiles break it in a single blow.
It may help u. This answer from is from " Science and Technology " of Physics of class 9th, written by S.k.Jain, and published by SRIJAN PUBILISHERS P.LTD.
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Ice is brittle, while bones are flexible; if you could only see such a blow in slow motion... it is a treat, really.
During the impact both ice and the fist bones distort, so it all depends which one reeches the distorssion limit first; the fist can lose you know!
Its sort of the same reason drunk drivers survive auto wrecks. An inelastic collision transfers all the force of impact directly to the surface contacted. This works well for billiard balls, but as the force increases, the mechanical strength of the material might be compromised. If a watermellon is dropped off a 5 story building, the inelastic collision destroys it completely. However, if the shell were flexible and the height decreased, the watermellon might survive the fall intact. Elastic collisions deform the object; the force is evenly distributed throught the medium and although the momentum is the same, the object itself experiences the force in a much more uniform way. Karate is based on the fact the human hand is a collection of bones and can deform upon impact. Properly preformed, a great amount of force can be transferred to a rigid object with no injury to the hand or foot delivering it. This is why karate demonstrations usually involve either the hand or foot and some rather rigid object. I don't think karate could be preformed using the head, which is one solid bone.
Studies have been done on martial arts experts that have been credited with superhuman impact strength. They've found that not only does muscle become denser and stonger with repeated stimuli over time but bone reacts to repeated heavy stress by becoming more dense over time. So, some of the blows your seeing might actually break the bones of a regular Joe.
In some cases stage deception is used, such as breaking boards along the grain or hidden notches or cracks in the material to be broken.
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