USA out of the Wold Cup !!

Originally posted by @blood-on-the-tracks
Well spotted. Get no argument from me there.

However, somewhat unusually, I seem to be on his side on this sports argument.

In rugby union, athletes weighing up to 20 stone, all muscle, take part in frequent high impact collisions. There are many injuries, muscular and osteopathic.

In UK the players are moving to reduce the number of g ...[text shortened]... ry.

I don't see how US Football, with heavily padded players , offers more chance of injury.

What is the 40 time of these athletes?

Force equals mass times velocity squared. Speed at the point of impact has much to do with it.

Originally posted by @eladar
What is the 40 time of these athletes?

Force equals mass times velocity squared. Speed at the point of impact has much to do with it.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3Dv-1MQ0Cnbhs&ved=0ahUKEwjdp7-MvvvWAhWD8oMKHWK8B4wQwqsBCE4wBA&usg=AOvVaw1hiWXYQ74B44XyVT94yxWp

Vs rugby


https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DOcF_PryJFug&ved=0ahUKEwi-7vyLv_vWAhUR84MKHflRCZwQyCkIITAA&usg=AOvVaw0Oe5Uc2a-gJOou6cJlPKy4

Notice the speed of impact and sudden change of direction difference.

Here is one with nfl guys getting knocked out. It is pretty long.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DU1i1hgyjsnY&ved=0ahUKEwim1qzxwPvWAhUo2IMKHXNBACoQwqsBCDwwCA&usg=AOvVaw1FudWv9McWl1Ae_sdBIrif

Originally posted by @eladar
https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3Dv-1MQ0Cnbhs&ved=0ahUKEwjdp7-MvvvWAhWD8oMKHWK8B4wQwqsBCE4wBA&usg=AOvVaw1hiWXYQ74B44XyVT94yxWp

Vs rugby


https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DOcF_PryJFug&ved=0ahUKEwi-7vyLv_vWAhUR84MKHflRCZwQyCkIITAA&usg=AOvVaw0Oe5Uc2a ...[text shortened]... v%3DU1i1hgyjsnY&ved=0ahUKEwim1qzxwPvWAhUo2IMKHXNBACoQwqsBCDwwCA&usg=AOvVaw1FudWv9McWl1Ae_sdBIrif

Here are some Rugby League knockouts. Look.....no helmets.......no pads

YouTube

Those pussies playing NFL wouldn't last 5 minutes playing rugby union or league.

Originally posted by @eladar
What is the 40 time of these athletes?

Force equals mass times velocity squared. Speed at the point of impact has much to do with it.

We use a 24 hour clock over here in Oz so I'm not sure.

Usually by 40 they're retired?

Not sure what you're getting at there my friend.

Originally posted by @eladar
What is the 40 time of these athletes?

Force equals mass times velocity squared. Speed at the point of impact has much to do with it.

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 back row forward in RU (that is 3 of the 8 really big guys on the team) is to be quick. Naturally they are not AS quick as the 13/14stone (approx 200 pounds), more 'skilful' players on the team. I imagine US football has a similar disparity?

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.

Hey, Champ.

I didn't bring Physics into it. No wiki needed for that pre 16 stuff. They teach that in schools over here, and I have a good memory.

Also remember my basic English, which seems to be sadly lacking every time you hit a keyboard.

Leave you to it, have fun.

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?

This is the one I was thinking about

The energy of a moving object is called kinetic energy, and is equal to one half of the object's mass times the square of its velocity: KE = 0.5 × m × v^2.


40 time is how long it takes to run 40 yards. Football is about explosiveness.

If you can't tell the difference between the explosiveness in football and the lack of explosiveness in rugby, you are blind.

Yep, Eladar.

Sorry , leaving you to our ignorant Aussie friend.

Enjoy!

Originally posted by @blood-on-the-tracks
Yep, Eladar.

Sorry , leaving you to our ignorant Aussie friend.

Enjoy!

Rugby is more of a jack of all trades sport.

Football does allow for specialization.

Because of the all out explosiveness of football, players only play offense or defense so they get rest.

Given equal size and athletic ability, a rested athlete will out perform a tired athlete.

Originally posted by @radioactive69
Here are some Rugby League knockouts. Look.....no helmets.......no pads

https://www.youtube.com/watch?v=rUSDd1xYY8A

Those pussies playing NFL wouldn't last 5 minutes playing rugby union or league.

Do you notice how slowly they move and no immediate change in direction at contact?

As I said, a lot more damage with less impact, much less exchange of kinetic energy.

I suppose if you are used to a slow game like soccer, rugby must be very exciting in comparison.

Originally posted by @eladar
Do you notice how slowly they move and no immediate change in direction at contact?

As I said, a lot more damage with less impact, much less exchange of kinetic energy.

I suppose if you are used to a slow game like soccer, rugby must be very exciting in comparison.

Soccer? It's football lasts 90 minutes normally played at top speed

American football lasts? Four or five hours now that's slow

Originally posted by @roma45
Soccer? It's football lasts 90 minutes normally played at top speed

American football lasts? Four or five hours now that's slow

Top speed is defined differently by different people. Are they constantly sprinting? If not, then it is not top speed.

Originally posted by @eladar
Top speed is defined differently by different people. Are they constantly sprinting? If not, then it is not top speed.

Try this experiment if you think football players do not sweat.

Sprint 100 meters as fast as you can. Give yourself 45 seconds to rest. Sprint 100 meters as fast as you can. Try to complete that sprint in the same time as the first. Give yourself 45 seconds to rest. Repeat this until you have completed 20 sprints.

Assuming you can run 100 meters in 15 seconds, this would result in 20 minutes of elapsed time but you will have only run for 5 minutes.

See if you can complete this task.

As a lad of 12 years of age, I weighed in before football practice and after football practice. I had to make weight and needed to lose weight before the first game. I usually lost two pounds during practice. The next day I'd weigh in about a pound less than the day before.