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In the two studies I was involved in years ago the measured force of strikes ( impact force, peak and median) we experimented with this very thing, just to confirm certain views and we found that the crucial element in ANY strike in terms of force is penetration ( though one must be very cautious of it not turning into a push).
Some boxers, if you see them, will actually deliver pretty powerful strikes with their lead leg planted and the only momentum being leaning forward.
this is true. turning it into a push can also throw you off balance. I've found that if your front foot isn't going to be planted, all the power focus can be placed on the pack foot, but you have to have forward momentum to achieve this. And the penetration thing is true, my younger students get a kick out of it when i mention PENETRATION.....LOL