40 yard dash times

[TexasBama]

In watching the Olympics, I did some surfing on the 40 yard dash. When Maurice Greene ran a 9.79 100 meters, his estimated 40 time was about 4.38 seconds.

So, arguably the fastest guy on the planet, on a track, with track shoes, with blocks, in a record 100 meter dash, only runs 4.38.

Might not want to put too much stock in reported 40 times :rolleye2:

 

[dayhiker]

Not really apples and apples comparison. Greene and others are still building speed at that point. They are training for longer events and their workouts reflect that. If their goal was for about 35 meters or so they would work out differently and also race differently.

 

[TexasBama]

I'd agree with you on someone that runs the 200m. You don't pace yourself in the 100m, though. The fastest split times are at 50-60 meters. The 100 is get to top speed as fast as you can and hang on.

 

[crimson_flame]

Straight mathematics...

If you are calculating 40 yard dash times from 100 meter times you first have to convert meters to yards(1 meter = ~1.0856 yards). So, his average time in the 40 yard dash would actually be 4.25! Yep, I figured that out all by my self. Football needs to get here in a hurry! RTR!

 

[jdpas29]

If you are calculating 40 yard dash times from 100 meter times you first have to convert meters to yards(1 meter = ~1.0856 yards). So, his average time in the 40 yard dash would actually be 4.25! Yep, I figured that out all by my self. Football needs to get here in a hurry! RTR!

did you take into account the acceleration that takes place from the start of the race to the 40 yard mark???

the first 40 yards of the race will be slower than any other 40 yard segment of a 100 meter race since it takes him a few steps to get up to full speed. :cool2:

 

[TexasBama]

Nope, actually figuring it off of his 30 meter time (3.81 sec) plus his 30-40 meter split (.88 seconds ) average over the difference between 40 yards and 30 meters (about 8 yards).

You're correct, though, its time for some football. :biggrin:

 

[CrimsonGlory]

40 times out of high school are more accurate for college prospects now then ever. As soon as five or ten years ago the recruit would have his high school coach send in the time(we all know what that leads to). Now, most players get their times from college camps, nike combines, etc, which use accutrac electronic timing or coaches trained to time unobjectively. That's why you see more and more wr's and db's with 4.5's and 4.6's getting big time offers. Because those times in the 4.5+ to 4.7 are actually very fast given the lack of time inflation that there was in the past.

So it's believable that world class sprinters run sub 4.4 times because IMHO anything close to 4.4 is world class speed.

 

[crimson_flame]

did you take into account the acceleration that takes place from the start of the race to the 40 yard mark???

the first 40 yards of the race will be slower than any other 40 yard segment of a 100 meter race since it takes him a few steps to get up to full speed. :cool2:

In order to figure acceleration I will need actual muscle density, divided by total body fat; multiplied by ligament elasticity plus what size shoe they wear!

 

[Bama-fo-life]

I feel stupid just being in this thread. I feel like I am in Physics. j/k.

 

[TexasBama]

Are you ready?

For some football!!!

 

[NateDogg]

There's no need to account for acceleration when comparing a 100m time to a 40yd time as long as you do so by the split times as was done. That means he calculated the time based on Mo Greene's first 40 yards which is correct.

 

[MajorOgilvieFan]

If you have 11 guys chasing after you to stop you from scoring the winning
TD........& this game is against Tenn./ the Barn/ the Gators, or anybody else
and with this game winning TD your team will remain undefeated & have a shot at the National Championship.........I'd say you'll run faster!
(how do you like that physics lesson!!! :biggrin: haha COME ON FOOTBALL....ROLL TIDE!!! :biga2:

 

[BamaSkins]

40 yards, that's 120 feet, that's about a 12 story building...I wonder what the 40 yard time would be if you dropped them off the side of a 12 story building...would that be world class speed? one of you math wizards figure that speed out for me please...that's the kind of speed I want to see in the 40...dropped off the side of a 12 story building speed...no more 40 yard dash times for me...oh yeah, now that's got to be fast...hurry up Sept 4!

 

[Alanbama27]

One more thing

Your 40 time on a track without pads is comparing apples to oranges when you're on grass with pads!

Fact - The difference in someone running a 4.28 and a 4.4 is negligable on a football field as the VAST majority of players can't catch either one! I laugh when I read a post that calls a guy who runs a 4.5 or 4.6 slow and a guy who runs a 4.4 as a speedster. The difference in the three is almost incalcuable by the human eye! People...you are talking about 1/100th of a second! I know people whose brains don't move that quick! :biggrin:

 

[TexasBama]

Off a building, 2.7 seconds roughly

 

[crimson_flame]

Very good Tex...

Off a building, 2.7 seconds roughly

It would take approximately 2.7386 seconds to jump off a 12 story building and splatter on the ground! Also that person would be traveling at about 59 MPH. BAM!

 

[drjamesm]

40 times

I can tell you one thing....the 40 times are not accurate. I talked to one HS coach (a jeff co HS)He said some kids are timed with a running start on a track with track shoes......This is not an accurate football time. I remember in HS my coach would time us on grass with fb cleats and helmets from a football stance. He said he wanted the times we would run relative to actual fball.
drjamesm

 

[TexasBama]

"It would take approximately 2.7386 seconds to jump off a 12 story building and splatter on the ground!"

Assuming air resistance neglible, I presume

PS:

I think the NFL combine must use a speed trap (i.e. reaction time is not included in their times).

 

[TommyMac]

"It would take approximately 2.7386 seconds to jump off a 12 story building and splatter on the ground!"

Assuming air resistance neglible, I presume

PS:

I think the NFL combine must use a speed trap (i.e. reaction time is not included in their times).

I'd assume that intelligence would be negligible for someone to jump off a 12 story building.

 

[TIDE-HSV]

There's speed...

and then, there's football speed. Last year, Shaun broke a 90+ yarder for a TD, with 21 people chasing him, never to catch up - and he's not known as a speed merchant. Even Holmgren, not a SA fan, grinned in the postgame and said "He showed some speed, didn't he?"