Visible force vs. applied force
A correspondent recently wrote to me asking about our martial art. He made the comment that “It seems great but a bit lacking in power.” I told him that if by that he meant visible force — yes, he was right. However “visible force” and “applied force” are 2 different things. Some techniques don't look "powerful" because they have a lot less "push". [For a detailed explanation of "force", "power" and the role these play in "hitting hard" rather than "pushing" see my article " Hitting harder: physics made easy ".] The front kick is a case in point. If you do it against a heavy bag you'll be tempted to hit it with more push so as to "feel powerful". On the other hand, when you kick a kickshield you can give it a resounding "crack" that your partner feels right through the shield but which doesn't move him or her more than a foot or 2. As a rule, we don't let students kick or punch th...