Originally posted by @blood-on-the-tracks
Actually, F = m x a. Force = mass times acceleration. Accn is not velocity squared. It is how your speed is increasing that determines the force of impact.
Mass x velocity squared (over 2) is the kinetic energy of an object.
I would guess that '40 times' are the speed for a 40m 'race'?
I don't know, but one required skill of a bac ...[text shortened]... 200 pounds), more 'skilful' players on the team. I imagine US football has a similar disparity?
Take it to the science forum bozo.
Nice use of wiki. I doubt you understood one word of what you rote but nicely copied and pasted.
In rugby league as opposed to rugby union more speed than bulk is required. All 6 forwards are both quick and large.
In both rugby's though players need to be good at basically all aspects of the game, with kicking an exception which is usually the expertise of a select few in the team.
In contrast in NFL it seems that players are only any good at one individual aspect of the game. The defensive team are just huge units with little speed and only tackle, basically nothing else. A punter does nothing but kick the ball then runs off again. My favourite position, the holder, holds the ball for the kicker then runs off again. Quarterback throws but couldn't tackle to save his life. They should have 11 players on each team with a couple of reserves who have to play attacking, defensive, and special teams roles. None of this crap where one team marches on and another marches off. Wimpy crap.