Can anyone with Physics PHD verify How to derive the speed vs power formula for a punch or kick?

[SeekerOfTruth007]

The power of a fluid striking an object is related to the Cube of Speed of the fluid multiplied by the mass of the fluid. (See Wind Turbine power formula for more specifics).

The Destructive Potential of the fluid is the 8th Order of velocity of the fluid, which is known from the Hurricane and tornado destructive potential formula.

I THINK this means if you increase the speed of a punch or kick, the destructive force goes up by doubling given the same person doing the punching or kicking.

Your fist or foot is not an ideal fluid though, it behaves as a quasi-solid when it strikes the target, but at the same time you have liquid in your fists and feet.

Furthermore, the Tensile strength and compressive strength of wood is 2 megapascals, while that of human bone is only 1.5 megapascals. Yet paradoxically, I can break boards and concrete with a punch or kick without hurting myself.

So the Gist of the Question is, "How do you figure out, without both a radar gun and a force meter, how fast your punch is, if you have only the force meter?"

Should this just be treated as an elastic collision or what? This is absolutely harder than General Relativity to solve, by the way.

Updates

+1 y

I meant to say, "if you increase speed of a punch or kick by 10 percent, the destructive potential doubles". This then means a 10 percent increase in speed doubles the number of boards or bricks you can break with a punch, ideally anyway, just like a 10 percent increase in wind speed doubles the damage it does in monetary value.

[Astarlessnightsky]

Without going into detail its a basic use of formular with unknown variables.

If you don't know how fast your punch is, you could calculate the speed if you know the mass and force applied.

But as mentioned alread, the human body is not just a solid object moving at a precise speed. There are liquidd involved like blood, solids like bones, but those bones are only loosely bound together, and absorb some of the force.

Also you have to estimate the mass, as not the entire body is moving and hitting the target, but professional athletes will put their their body to use and generate force from the toes, over the hips and shoulders into the punch.

Its really complex, but i would guess there are severel experiments done already with tables of the resulting force for different athletes and their respective mass and speed.

[SeekerOfTruth007]

Yes, to everything you said I think. Believe it or not, points sparring karate and full contact karate both use a "China/Gojuryu" vertical fist punch, because they've proven it is both faster and more powerful than a professional boxer's punch, whether or not you torque your hips and shoulders. With the full body thrown in you generate massively more speed and power.

I guess it would be best to just use both a force meter and a radar gun at the same time.

[exitseven]

I remember that Force equals Mass X velocity squared.

[SeekerOfTruth007]

Yes, but Physics is an imperfect science. In a wind turbine, Power equals the cube of fluid velocity.

The problem is a hand and arm is neither a solid nor a fluid, but rather a heterogenous mixture of both. Plus water behaves as a quasi-metal in medium velocity collisions, not a fluid. Water in our bodies can be in 3 different phases: Gas, liquid, and quasi-metal. There are at least 10 ice phases of water and 2 metal phases and then liquid and gas. I don't know whether the fist is treated ellastically or what.

[exitseven]

This should be done with calculus. There is a whole range of values and it should probably be displayed on a graph.

[SeekerOfTruth007]

Yes, you'd need to test it with both instruments anyway to get the best real science. It would be a scattered curve with a central mean and you could calculate an R value and Standard Deviation, etc. Good points so far. Thanks for commenting. I did pass both Calculus 1 and 2 and could have passed calculus 3 but LSU taught Differentials between Calc 2 and Calc 3, so I never got a chance to take Calculus 3 because I flunked the Second Differentials test. Anything above 2nd order differentials is beyond my comprehension really.

[exitseven]

This was all a long time ago.

[SeekerOfTruth007]

The Metallic/Quasi-Metallic state of water during a collision can't be tested easily in the human body, and the only way to generate in a laboratory is using a Diamond Anvil. I don't know what the material properties of "Metallic Water" really are, but I assume it is incredibly hard, possibly even harder than Sapphire. This effects how the collision works, and explains why a properly thrown punch can break concrete or wood without breaking your own hand. the water in your hand "shields" the bones from being damaged, if your punch hits hard enough and fast enough anyway.

this is sort of like the mechanical equivalent of the Liedenfrost effect in Thermodynamics.

[SeekerOfTruth007]

I cannot be certain of this, but I suspect that the faster you punch, the harder the water in your hand becomes, thereby explaining herculean Okinawan Karate feats such as punching a baseball bat in half or breaking 12 concrete tiles with a palm heel, all proven on camera of course.

[SeekerOfTruth007]

Anyway, water must be the single most important and ridiculous thing God ever created. It has more phases than any other molecule I know of, and it's vital to life and everything else about civilization.

[exitseven]

It is the only substance that expands when frozen.

[SeekerOfTruth007]

Yes, I've tried to write a paper about that one time, but the professor who reviewed it rejected it, because I was trying to explain there may be an unknown law of physics involved in that or else an unknown particle. I don't think the paper should have been rejected just because I couldn't' offer more than a Hypothesis. From my point of view, I thought it was worth pointing out once in a while that the standard model doesn't entirely explain the phenomenon. Oh well. It's possible someone with more tailored education experience and more time to spend on the topic might solve that one day.

[exitseven]

Thanks for the MHO😎

[Fireguy17]

think of it like this, we use it at the race track all the time.
Horsepower is how fast you hit the wall, torque is how far you move the wall.