Again, this one is a little onlg winded, but physics can be hard to grasp.
Kane said:
So 700PSI or 900PSI can only be achieved with boxing gloves? So without boxing gloves, what PSI would the punch be with your bare-handed punch? Or was those numbers (700PSI and 900PSI) achieved without gloves? Is it possible to get those numbers without gloves? Again, would it be high or lower?
Essentially, the gloves lower the applied force/pressure/impact by making the striking surface larger, thereby dispersing the force over a greater area; more area means less force per unit of area. Without the goves the striking surface is smaller, so a greater force is applied to each unit of area. If Mr. Tyson is operating at a prime and constant effort (assumption), then theoretically the force he generates will always be the same no matter what the striking surface. Changing the striking surface from glove to fist to whatever, will change the pressure or applied force (felt impact or damage), but the force generated with always be the same.
Kane said:
also, if it is called pounds of force what are the pounds of force of 700PSI or 900 PSI in a punch? I was sure that they could measure the pounds of force with punches (and maybe kicks which would probably be more).
You can only determine the pounds of force from a PSI (pressure) amount if you know the striking surface area. This we have to assume, unless you can get Mr. Tyson to measure or let you measure his fist or glove or whatever he hits you with. In this equation you have three variables (force generated, striking surface area and pressure). If you have two of them you can solve for the third.
Kane said:
They have measured lion or tiger bites, and that is at 1,000 pounds of force. Lions and tigers bite with their four canines and those canines are about one inch away meaning that their PSI should be 4,000PSI.
I am assuming if there is someway to measure a cat bite, I'm sure a human punch even without gloves could be measured.
I think they have measured force generated by the animal's jaw. This would be in pounds of force, but again that number doesn't mean much unless you know what area it is applied across. In this case it is a very small area of the four first contacting teeth (canines), but as the canines sink in, the dynamics of the system change. After the bite is sunk, all the teeth are in contact and so the force is applied over a much greater area, thereby lessening the pressure. If there is 4000PSI of jaw force, there are four initial teeth making contact and they each have a one quarter square inch of surface area (striking surface), then each tooth shows a 4000 PSI pressure initially (because it will change when they sink in and the rest of the teeth come into play). The equation is F / n / A = P (F=force=jaw force generated, n=# of teeth in contact, A=striking surface area=tooth striking surface, P=pressure=felt impact), 4000/4/.25=P=4000.
In terms of a human punch, the equation is the same. F/n/A=P (one fist, so n=1 and can be dropped). If Tyson generates 900 PSI (=P) with a punch that is 7 in^2 (=A) with a glove (assumed) and he punches level and true to that assumed surface of his fist, then his generated force would be 6300 pounds of force (=F). If the same punch was leveled without a glove and we assume that the lack of glove reduces the striking surface of the punch by 2 in^2, then the ungloved punch would be 1260 PSI, a differance of 360 PSI. Theoretically, that's about 360 PSI more pressure or impact if he punched without a glove.
None of this takes into account the absorbing effect of the glove padding, which reduces force by using it to compress the padding in the glove before the force can be transfered through the padding to the target.
