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| Messages 1 - 16 of total 16 in this topic |
donini
Trad climber
Ouray, Colorado
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Topic Author's Original Post - Aug 27, 2015 - 05:20pm PT
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Usain Bolt proved once again that he is the best sprinter ever, coming off of injuries to win the 200 meters in the 5th fastest time ever.
The week long World Track and Field Championships are being held in Bejing.
Tune into Universal Sports to watch the best sport there is.....even more universal than Futbol.
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WBraun
climber
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Aug 27, 2015 - 05:38pm PT
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I ran hurdles and did high jump 4 years in high school.
I love track and field.
Usain is a smokin fast dude.
What did you do in track and field Jim?
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donini
Trad climber
Ouray, Colorado
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Topic Author's Reply - Aug 27, 2015 - 05:41pm PT
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Werner, I was primarily an 880, mile guy but had enough leg speed to run the 440....especially in relays.
Once a track and field nut, always a track and field nut.
I remember that Bridwell was a good hurdler.
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Gary
Social climber
Hell is empty and all the devils are here
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Aug 27, 2015 - 06:14pm PT
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Always thought the 220 was the toughest event.
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SC seagoat
Trad climber
Santa Cruz, Moab or In What Time Zone Am I?
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Aug 27, 2015 - 06:24pm PT
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I saw Usain get run over by a Segway. Scary.
Susan
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zBrown
Ice climber
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Aug 27, 2015 - 06:27pm PT
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Interesting segue(s). Which one is donini?
Local Little League team is still going strong.
SVLL (Sweetwater Valley Little League - Bonita CA). May end up playing some of their cousins on the Mexican team in the final game. The great Mexican-American pastime, eh?
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bhilden
Trad climber
Mountain View, CA/Boulder, CO
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Aug 27, 2015 - 10:08pm PT
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Genzebe Dibaba has the best moment of the WC. She ran 1:56.9 for the final 800m of the 1500m for the win. It would be the fastest time of the year for the scratch 800m!
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Reilly
Mountain climber
The Other Monrovia- CA
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Aug 28, 2015 - 07:23am PT
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He should change his name to Insane Bolt, not because he is but because of how he does it.
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Vitaliy M.
Mountain climber
San Francisco
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Aug 28, 2015 - 10:37am PT
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Human body is incredible.
Lineman coach in my HS was also the discus throwing coach, so I did that for a year. Fun stuff. Wish I was fit enough to do any sort of running in high school! 2.5 miles was like discovering moon when I first ran that much. At about 300 lbs. I think when I did 2.5 miles I was probably under that though. 300 was right before I joined the team.
Lost about 40 lbs+ that year! Scary to think of what my life would be like now if I did not join the football team...
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JEleazarian
Trad climber
Fresno CA
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Aug 28, 2015 - 02:24pm PT
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Werner, I was primarily an 880, mile guy but had enough leg speed to run the 440....especially in relays.
Once a track and field nut, always a track and field nut.
I remember that Bridwell was a good hurdler.
I didn't realize you were a middle distance runner, Jim. The 880 was probably my best event, but it was also our track team's best event, so I usually ended up in the two-mile. Before I ran on the varsity, I would also throw the discus (in "C" class. Anyone who knows my height knows why I was not a varsity weight man).
Although I was a two-year varsity letterman, my desire for distance running started to wane after I started climbing my junior year. Climbing had that same mind-over-matter challenge as distance running, but was much more fun. I remember the brother of one of my team mates saying, after watching a middle distance race, "I'd rather be a rock than run the half-mile. It would be a lot more boring, but a lot less painful."
I still follow track and field, though. I'm particularly blessed to have the California State meet held locally. Despite the lack of coverage in the U.S., California track and field is alive and well.
John
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Ed Hartouni
Trad climber
Livermore, CA
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It's all in the physical world or the world of physics. Confirm with Hartouni.
[Click to View YouTube Video]
your wish is my command...
the link refers to an article:
Eur. J. Phys. 34 (2013) 1227–1233 doi:10.1088/0143-0807/34/5/1227
On the performance of Usain Bolt in the 100 m sprint
J J Hernández Gómez, V Marquina and R W Gómez
Abstract
Many university texts on mechanics consider the effect of air drag force, using the slowing down of a parachute as an example. Very few discuss what happens when the drag force is proportional to both u and u². In this paper we deal with a real problem to illustrate the effect of both terms on the speed of a runner: a theoretical model of the world-record 100 m sprint of Usain Bolt during the 2009 World Championships in Berlin is developed, assuming a drag force proportional to u and u². The resulting equation of motion is solved and fitted to the experimental data obtained from the International Association of Athletics Federations, which recorded Bolt’s position with a laser velocity guard device. It is worth noting that our model works only for short sprints.
which is an interesting article...
Bolt reaches terminal velocity in about 2 seconds, 92.2% of the energy he generates is absorbed by the drag, 7.8% is used to achieve the motion. The paper concludes that aerodynamic drag (proportional to the velocity u) and the turbulent drag (proportional to the velocity u² ) are required to get a physical model that describes Bolt's performance.
The terminal velocity of Bolt is estimated to be 12.2 m/s, and his average speed in the second half of the sprint is recorded at 12.15 m/s
Among other amazing facts:
Bolt's initial acceleration is roughly 1 g
and that he exerts the maximum constant (horizontal) force, of order of his weight...
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zBrown
Ice climber
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Thanks Ed. I love it when you talk down & dirty physics. :)
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