I am a 3rd Degree black belt in Taekwondo and regularly break both wood and concrete. I have a few questions that I wonder if you or another might know the answer to? I have three questions
When stacking concrete slabs with spacers, how much force does it take to break the first and, is the same force required for each succeeding slab in the stack?
Also, I keep hearing people speak of striking and then immediately retracting the striking hand (foot) to limit its contact time and ability to reabsorb the energy. This seems counter-intuitive to me since when you power break stacks of concrete you make a deliberate effort to involve not only your whole body mass, but also to drive all the force through your target (and only stop after all has broken). Can you explain these two seemingly different approaches to contact time?
With this in mind, might we suggest that the concrete is broken both from the shock-wave of energy and from the ensuing mass that follows - or is there no such thing as kinetic energy being transferred without continual contact time on the target?
- Next >>