I know there is alway the rumor of Bubka and a 10.1 m/s vault. But does anyone have the documented measurements of this? What meet and what did he jump?
What I am trying to do is calculate the energy put into the vault, and then how much energy they added after they leave the ground.
If Bubka were to run at 10.1 m/s then he would put in just enough kinetic energy to raise his center of mass about 17', and since his center of mass is probably about 3' off the ground that puts the vault at just over 20' (ie. the world record).
But in the 1987 vault if he was only running 9.5 m/s then he would have put in enough kinetic energy from the run to raise his center of mass 15' which is just over a 18' vault. But since he jumped 19'2 in that vault. Which means he added about 260 Joules of energy to the vault.
One of the goals to this is, had he used the same technique at the top of the vault would he have jumped 6.45 meters (which is the equivalent of what you would get from adding the extra 260J to a 10.1 m/s vault). And I know some people argue he has jumped close to that height, so maybe he was able to, just the bar was not there.
And I know that we are not in a vacuum and there is loss of energy in the pole and things like that. But the data is still very close to the real numbers we get from Bubka's vaults. Since 10.1m/s comes out to 6.12m vault and the energy added from the technique in the 1987 vault comes out to about 6.45m vault, which is what some people argue he should have been able to jump if he was not raising his PR 1cm at a time.
But as a side not: in Jenn Surr's 4.92 vault, she only added about 56J of energy to her vault. This amount of energy raised her vault 9cm. Because of her weight being less than that of Bubka's she needs less energy to raise her vault height, so if she were to put in enough energy to raise her vault 33cm more than just her speed allows (as Bubka did) you would get a vault of about 5.16m.
ADTF Academy wrote:here is another interesting point I thought about.
At what point in time exactly does the concepts switch from Kinetic to Potential?
As soon as we leave the ground
As soon as the pole stops bending
As soon as the pole starts unbending
As soon as your imagination states it does
Depending on your thoughts on this it will also have an effect on the equation and actually Potential energy needed or used to vault X height and thus the relationship between energy in and energy out changes. Personally I don't think we have ever scratched the surface of how complex the physics is in the vault. Anyone got the money to front a high end project cause till one is done we are guessing.
ADTF Academy wrote:Thank you Brian......
#1 question I have always wanted to know in pure data... How much energy does it take to bend a pole to x % when the pole is Y stiffness? Does the energy used get redistributed when the pole unbends or what % is lost from the bending to unbending process. These are only a few things that really have never been studied or at least I have never seen any data on.
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