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Originally Posted by panda_strike2
I think there are two equations to look at for the "impact" of a punch:
Force = mass * acceleration (equal parts size and speed)
Kinetic Engergy = 1/2 mass * velocity squared (speed is more critical than size)
Which one is more appropriate for the impact a punch does, I'm not sure of. I think the Kinetic Energy (speed-related) creates the "smack" that registers with a guy like Tyson more than Tua and the force is definitely what moves the other guy off of his center of balance and stops his momentum. I don't know which is more applicable to causing a concussion or a broken rib, though. I'm interested in hearing from someone more knowledgable on that.
BTW, the standup technique forum might give better answers.
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Hmmm... this would support the idea that fist/forearm mass can have a significant impact on power. Especially from "arm punches" that don't have the body behind them, Foreman seemed to be able to club guys, maybe his massive forearms had something to do with it. 25% more weight = 25% more power.