Um, no. Maximum acceleration is at the start of the movement, and the hand may or may not accelerate through the entire distance from start to impact, depending on other factors. It will reach it's highest VELOCITY at some point towards the end of the movement, however.
I can only assume you never passed Jr High physics.
I have a physicist/martial artist on my side who said the following: Ground and pound is more devastating than punching someone standing, because with ground and pound you choke the reaction (if the head is planted down) from the target. So even though you are throwing arm punches, they are more devastating than if both of you stood up.
Ground and pound relies on the ground removing the ability of the head to recoil and lessen impact. That has nothing (zip, zero, zilch, nada, bumpkiss) to do with your claims.
The mass of an object is fixed unless you physically change the object itself since mass is simply a measurement of the matter within any given object.
speed and mass are irrelevant to "power" from a physics standpoint since power is a measurement of work over time. colloquially when fighters refer to power they are really referring to a fighters ability to cause maximum damage with a minimal number of strikes. When looking at damage caused by a strike or kick or something similar it is more beneficial to look at Kinetic energy/momentum and how it relates to the force distributed by a punch/kick/etc. But as many kinesiologist will tell you, getting perfectly accurate measurements on this from humans is near impossible due to the expansive factors to take into account. That's why they usually use static inanimate targets to measure these things.
This is a tough statement to accurately measure. When testing against inanimate static targets it is possible for lightweights to hit with as much force as a slow heavy weight. However, this does not translate directly into causing damage to a living target as many other factors need to be taken into account such as an opponents ability to "absorb" the strike and cause a negative acceleration, or the amount and density of various tissue covering vital target areas, distribution of force across the striking surface, and much much more. In most cases a lightweight fighter has less mass so will need more acceleration to deliver the same force as a heavyweight but additionally a heavyweight likely has more tissue mass covering vital areas allowing the to take more/heavier hits than a light weight would which would give most heavyweight fighters a slight advantage over light weight (not taking into account other factors such as reach).
Because the text was never meant to be a substitute for an instructor.
Example: If you are standing with your weight equally distributed and you are going to do a lead leg front snap kick as you raise and chamber your lead leg, bringin the foot "Backward' the weight distribution goes from 50/50 to 100% on the support leg. Now as you extend your leg for the kick you can shift your weight forward into the kick.
If you stand up against a wall and get hit it is the exact same effect as ground and pound. What causes more damage in ground in pound is not relative to you having more or less mass thrown into the punch, you can throw just as much mass into a punch standing and cause a higher acceleration due to being able to push with your feet effectively hitting with a greater force. What makes ground and pound dangerous is that the person is literally getting hit twice with one punch. If you hit a person causing their head to accelerate into the ground the ground hits back with an equal force. So one punch equals two hard hits and not being able to recoil defensively because you are on the ground means the bulk of that force is delivered to vital areas in the head. I would question your "physics" friends credentials a bit. I've never heard of choking as a scientific term outside of electrical current (in electrical engineering, choking is the process of blocking high frequency AC while still allowing DC and low frequency currents to pass through a circuit) If he is simply saying that you are "choking" the flow of the technique (kinda like the choke on a carburetor) then all you have to do is get closer or punch further into your target. And as stated previously "power" is a vague non-descript word that does not effectively convey the point you are trying to get across, as power is W/t.
no, it's all the same mass. The energy transferred changes. You can shift more mass and accelerate it at a higher velocity but again this is changing the Kinetic energy end of the equation not the mass. I think your wording is just a bit off and that's why it's hard to get your ideas across.
that is a very wrong and unscientific explanation of things. The amount of force delivered by an object directly correlates to velocity and mass. you can hit just as deep by not pulling your punch which takes a conscious effort. The fast punches will without any doubt hit harder than a slow punch. This is not to say that they will cause more damage because they won't necessarily. When you hit an object you apply a force and if the force is great enough it will cause an acceleration on it. when the object is unable to accelerate any further because there is another object behind it, like when doing ground and pound, the force the object applies on the ground also gets applied by the ground to the object. This becomes measured as a compression force on each side. This is why ground and pound can cause more damage with a weaker punch. But I digress, as this has nothing to do with your initial post. If you really want to know the science behind how to throw an effective kick, the math involved in kinematic studies is a bit tricky but here is a general study that can give you an idea. Kinematics is messy and rarely gives anything conclusive but it does help improve performance.
www.ncbi.nlm.nih.gov
that is a very wrong and unscientific explanation of things. The amount of force delivered by an object directly correlates to velocity and mass. you can hit just as deep by not pulling your punch which takes a conscious effort. The fast punches will without any doubt hit harder than a slow punch. This is not to say that they will cause more damage because they won't necessarily. When you hit an object you apply a force and if the force is great enough it will cause an acceleration on it. when the object is unable to accelerate any further because there is another object behind it, like when doing ground and pound, the force the object applies on the ground also gets applied by the ground to the object. This becomes measured as a compression force on each side. This is why ground and pound can cause more damage with a weaker punch. But I digress, as this has nothing to do with your initial post. If you really want to know the science behind how to throw an effective kick, the math involved in kinematic studies is a bit tricky but here is a general study that can give you an idea. Kinematics is messy and rarely gives anything conclusive but it does help improve performance.
This is in no way definitive but explores possible methods for delivering an effective round kick (that's why it has "discussion" at the end instead of "conclusion")A biomechanical analysis of the roundhouse kicking technique of expert practitioners: A comparison between the martial arts disciplines of Muay Thai, Karate, and Taekwondo - PMC
The purpose of this study was first, to determine whether there were differences in the roundhouse kicking leg kinematics performed by highly skilled Muay Thai, Karate and Taekwondo practitioners (n = 8 per group). Next, analysis aimed to identify ...
You are focusing on the leg and not the foot.
