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How can one apply these physical principles in karatedo?

Use of body dynamics

First, good balance is needed. Because of the law of reaction, a punch creates reaction in the opposite direction. Therefore, it would be completely ineffective if the body were to move back on impact. Thus gravity force is used to nullify the effect of the reaction force. The stability of the body is determined by three major factors: the weight, the base, and the position of the center of gravity. The weight is a constant factor: the base is determined by the position of the feet on the ground; and the center of gravity is located approximately one inch below the navel. As the surface of the base is increased, the mobility of the body decreases, the best compromise being when the feet are shoulder width apart. It can also be easily demonstrated that maximum stability is achieved when the center of gravity is located vertically over the center of the base. In this position, the weight is equally spread on both legs. The knees must be bent to insure a correct dispersion of weight on each foot and to be able to use the spring of the legs to move faster. The body should be kept erect so that its center of gravity continues to fall over the center of the base.