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Performance Area => Strength, Power, Reactivity, & Speed Discussion => Topic started by: seifullaah73 on April 08, 2012, 08:34:19 am
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Here is an article i found on the internet, which is quite interesting.
As promised, as soon as the results and split times from Bolt's unbelievable 9.58s performance were available, we'd be analysing them
Turns out they became available rather quickly (not 9.58s kind of quick, but quick nevertheless). So here is the analysis of Bolt's race.
All the splits
First of all, here is the table published by the IAAF this morning, containing all the splits and times for 20m intervals, for both the semi-final and final:
(http://1.bp.blogspot.com/_ua8ycqfc4ok/Sok0X9U62uI/AAAAAAAABq8/HJwymrWaDn4/s1600-h/Table.gif)
The Rest of the article can be found here: http://www.sportsscientists.com/2009/08/analysis-of-bolts-958-wr.html
I know a lot of people say that Usain bolt when he reaches top speed he decelerates slower than the rest but the problem with that lies in the split he attained.
if we look at the split times for usain bolt.
20m = 2.89s so he is still accelerating acceleration = 6.92m/s^2
40m = 4.64s still he has not reached top speed because if he had then his max acceleration would be less than 10m/s^2 = 8.6m/s^2
60m = 6.31s still 9.51m/s^2
80m = 7.92s now he has reached max velocity with an acceleration of =10.10m/s^2
100m = 9.58s = 10.43 m/s^2
You can see how is possible for him to maintain his speed when it can clearly be seen that he is able to accelerate pass 60m when he is upright when he reaches 80m this is evident in the video of the race.
Overall looking at the split times he was able to accelerate in upright position as he was able to achieve 80m in less than 8 s but 60m over 6s.
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Overall looking at the split times he was able to accelerate in upright position as he was able to achieve 80m in less than 8 s but 60m over 6s.
Not necessarily.
His 40-60 time is 1,67, while his 60-80 is indeed faster ( 1,61 ), but that says nothing about acceleration.
Example:
Athlete covers 20 m accelerating from speed A m/sec to 2*A m/sec
Then he covers the next 20m decelerating from speed 2*A to 1.5*A.
Although during the second split the athlete lost 25% of his speed , he still covered them faster than the first 20m.
Physics is a bitch bro ;)
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Yeah, its kinda confusing how he is able to run faster than his first 20m during the last 20m of his race if he loses 25% of his speed during deceleration phase.
But i can understand if it is faster as that is the part where you start the race from an initial velocity of 0 and then start increasing but won't reach a high speed until about 30m into the race. But how is he able to run faster in the last 20m then his 40-60m.
never mind.
we'll just do what other scientist do, there must be a factor that is helping that is genetics. we don't know how it just does.
:P