Читать книгу Scientific Karate Do онлайн

49 страница из 64

Thus the shorter the time, the greater the force generated. As a result, the force should be concentrated in as little time as possible. Therefore, speed being directly proportional to force, it is conceivable that a person of smaller physical structure (who is generally capable of greater speed than his counterpart of a larger structure) is able to create enough force to match and possibly supercede the force of a much larger man. Thus, it is said of a karate practitioner that size has no bearing on capability in the fighting art.

The reaction force

The reaction force is that which results from the application of a force to a specific point and directly opposes the initial impact. If you kick on the ground with your foot, using your muscular force and gravity, it creates an upward force in your foot and body which can be reutilized in another direction. It is this reaction force which is used by high jumpers when they stamp on the ground before jumping. It is used in karatedo in much the same way. The ground is kicked just before punching or kicking and the reaction force is transmitted through the body to the fist or the foot, adding a momentum proportional to the force of the kick on the ground [when there is no loss of momentum. (If the ground is soft it may' absorb part of the energy generated by the kick.)]