Speed Vs Power

[Wing Woo Gar]

But it was not the equation of force, it was the equation of power, and it is surely correct.

Power is energy/time, and force*distance = energy, so power = energy/time = force * distance/time = force * velocity

Applying a certain FORCE at a certain speed in a given direction defiens the power output (energy transfer per unit time).

But this velocity is not the same as the velocity of the fist before impact, it is the speed during impact, througout the contacttime - this is where energy is transferred. And if there is little mass behind the first, it will stop quickly and "energy transfer" is low even if the transient peak force may be high.

Very well said, I stand corrected.

 

[Same Trick]

Where:
W+t+F = What the F**k = what I think when I see formulas re: MA

My understanding is:

Where:
IF = Impact Force
fc = facial contact

Then IF + fc = n$ @ the MD

Hey, formulas are pretty fun after all.

I knew someone that insisted to call forms(kata/taolu) as formulas…. I too think formulas are fun

 

[HighKick]

If you punch with just your arm your hand will be moving at the speed of your arm, if you put your hips into it your hand will be moving with the speed of your arm plus the speed of your hips, for a more in-depth explanation see post #50.

No, but this should create more Force, assuming the technique it correct.

 

[PhotonGuy]

So I want to reference the videos that Kung Fu Wang provided in post #4, with the fellow in the first video, when he throws the strikes his hands are moving faster than the hands of the fellow in the last video when he throws his strikes. The fellow in the last video is getting the strikes off faster but the strikes themselves aren't faster.

Again, it would be like the analogy of a 9mm Uzi vs a .270 bolt action rifle, with the 9mm Uzi you're going to get off many more shots per minute than you will with the .270 since the Uzi is a full automatic. With the .270 however, the bullets will be going faster. A 90 grain bullet of .270 caliber has a muzzle velocity of 3,603 fps as opposed to the 9mm which at a weight of 60 grains has a muzzle velocity of 2,010 fps.

So the guy in the first video would be like the .270 bolt action rifle and the guy in the last video would be like the 9mm Uzi full automatic.

 

[HighKick]

So I want to reference the videos that Kung Fu Wang provided in post #4, with the fellow in the first video, when he throws the strikes his hands are moving faster than the hands of the fellow in the last video when he throws his strikes. The fellow in the last video is getting the strikes off faster but the strikes themselves aren't faster.

Again, it would be like the analogy of a 9mm Uzi vs a .270 bolt action rifle, with the 9mm Uzi you're going to get off many more shots per minute than you will with the .270 since the Uzi is a full automatic. With the .270 however, the bullets will be going faster. A 90 grain bullet of .270 caliber has a muzzle velocity of 3,603 fps as opposed to the 9mm which at a weight of 60 grains has a muzzle velocity of 2,010 fps.

So the guy in the first video would be like the .270 bolt action rifle and the guy in the last video would be like the 9mm Uzi full automatic.

Your argument is sound, but your proof is off.
While you are close to right on the .270 (about 3,000 fps), you are Way off on the 9mm. They come in at about 1,300 fps max.

 

[Wing Woo Gar]

Your argument is sound, but your proof is off.
While you are close to right on the .270 (about 3,000 fps), you are Way off on the 9mm. They come in at about 1,300 fps max.

See my post #58.

 

[PhotonGuy]

Your argument is sound, but your proof is off.
While you are close to right on the .270 (about 3,000 fps), you are Way off on the 9mm. They come in at about 1,300 fps max.

That depends on the weight of the bullet, a 9mm Parabellum round that weights 60 gr can reach speeds of over 2,000 fps.

9×19mm Parabellum - Wikipedia

en.wikipedia.org

 

[PhotonGuy]

See my post #58.

Well it would also depend on the target, as to how much of the force is transferred to the target. Let's say you're shooting at a deer, depending on where you hit it the bullet might or might not fully penetrate. If you only hit soft parts of the body the bullet could very well fully penetrate and pass through without transferring much of its force, if on the other hand you hit a large bone the bullet might not pass through in which case most of its force would be transferred to the target.

 

[PhotonGuy]

I know what it is. Thanks.

But not everybody on this thread might know that, particularly people without backgrounds in physics.

 

[Dirty Dog]

That depends on the weight of the bullet, a 9mm Parabellum round that weights 60 gr can reach speeds of over 2,000 fps.

9×19mm Parabellum - Wikipedia

en.wikipedia.org

Only if you've got a really long barrel. Muzzle velocity is a function of the size of the powder charge, the weight of the bullet, and the length of the barrel.
2000 fps 9mm requires a +P or +P+ round and most likely a Pistol Caliber Carbine. It's generally thought that a steady diet of +P ammo will lead to premature failure of your handgun. +P+ ammo, which has no max limit on pressure, is generally a bad idea.
I'll also point out that using that RBCD hardball ammo for self defense is... less than optimal. You'll find that a purpose designed defense round (I like Hornady Critical Defense) using a 115gr slug and hitting 1000-1200 FPS from a 4" barrel is much more effective.
Additionally, RBCD ammo is generally considered crappy ammo.