>>>Hi,
>>>
>>>>No, momentum is mass * velocity: the reason why a fist hitting a face does more damage to the face than vice versa - the fist, even though lighter than the face, because of its speed has a great momentum. The stationary face, although heavier than the fist, has no momentum.
>>>
>>>Huh? So if the fist was stationary and the head hit the fist at the same speed then the fist would suffer the most damage <g>
>>
>>Not so funny aamof. Yes I guess the fist would come off worse, maybe broken finger bones. How about a head-butt? Both heads about the same mass but only the stationary one feels the pain, although action and reaction are equal and opposite.
>
>That's because the head-butter is usually a drunken yob, feeling no pain ! <s>

Or Dave Cowan, ex Boston Celtic.