" @SlimJ87D: Cool what do you work as And i dont think you understand , i'm not saying thunderclaps are magic but because some of these guys are magic we dont know if they abide by Newtons law of pressure therefore we can't use that to judge their claps, you're right about flash as he isn't magic , and i'd agree it could be Flash . I say Flash but it could be BA or Herc , maybe Hulk , its his trademark. "
I'm a Mechanical and Material Science. Kinda bored with it, wish I was a Cop. I just got another job yesterday so I'm real happy about that. You hit this point where you don't know if you wanted to do what made you happy or you want to do what made your parents happy -_-" @SlimJ87D: One thing to point out is that it will also depend on the rigidity of the materials. Banging two pieces of putty together is not going to create the same amount of noise as banging two blocks of iron together. In that regard, Superman and Hulk should be capable of generating far more forceful impacts without harming themselves than Flash.
Of course, that brings up one big issue with Flash; he can generate enormous velocities and accelerations (meaning he should be generating enormous kinetic energies and forces), but somehow does it with what is otherwise normal human physical strength, and survives theses velocities with what is otherwise normal human physical resilience. Basically, it seems like he somehow generates huge accelerations, but without generating the appropriate forces that should liquify his body. So basically, F=ma doesn't seem to apply to him.
Of course, unlike speedsters in other comic universes, Flash actually does have a vague explanation for this: the Speed Force. Frankly, when I first heard about it I had always assumed the writer's had made it up specifically to address these kinds of issues. So basically, any time Wally does something at super speed, the corresponding force should probably be denoted as maybe Fs (I'd make the s a subscript if I knew how), to differentiate it from normal Newtonian forces. No idea what the actual equation would be, but it just seems to me the function of the Speed Force is to (pretty much magically) supply Wally/speedster X with enormous acceleration while somehow circumventing the normal issues that would crop up from Newtonian mechanics.
I'd also point out a little detail in reading the equation: F=ma works both ways. Yes, if you can accelerate rapidly, there is a great force associated with it. However, it is important to understand that it also works in the opposite way; acceleration doesn't just magically come from out of nowhere, you need a massive force in the first place to create such an acceleration. Aside from speed, Wally can't really generate massive forces (I don't think he can lift multi-ton objects, for instance), so he's an exception, and his speed really does magically come from nowhere (Speed Force).
Relativity is kind of similar. People sometimes say that mass (or more properly, mass-energy) increases as something moves near light speed, which is sort of true, but what they often overlook is that the mass/energy doesn't just magically come out of nowhere when you move that fast, rather, you need to generate that amount of mass-energy to get to those high speeds in the first place. "
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