Search found 166 matches

by willrieffer
Wed Apr 25, 2018 3:33 pm
Forum: Pole Vault - Advanced Technique
Topic: Physics- The Bottom Arm in the Immediate Post Take Off
Replies: 0
Views: 5391

Physics- The Bottom Arm in the Immediate Post Take Off

Physics of The Bottom Arm in the Immediate Post Take Off The immediate post take off is regulated by the dispersion (not loss) of initial kinetic energy into 3 areas. 1) residual kinetic energy (horizontal veloocity) 2) pole energy and 3) potential energy. The lead arm can play a role in the directi...
by willrieffer
Wed Apr 25, 2018 3:27 pm
Forum: Pole Vault - Advanced Technique
Topic: Bottom Arm Technique -*Help Needed*
Replies: 9
Views: 18050

Re: Bottom Arm Technique -*Help Needed*

Physics of The Bottom Arm in the Immediate Post Take Off The immediate post take off is regulated by the dispersion (not loss) of initial kinetic energy into 3 areas. 1) residual kinetic energy (horizontal veloocity) 2) pole energy and 3) potential energy. The lead arm can play a role in the directi...
by willrieffer
Sat Apr 02, 2016 10:02 pm
Forum: Pole Vault - Advanced Technique
Topic: Placement vs. Pressure
Replies: 31
Views: 45802

Re: Placement vs. Pressure

https://scontent-ord1-1.xx.fbcdn.net/hphotos-xap1/v/t1.0-9/408_10206009575101773_7617765204339541568_n.jpg?oh=2611a84cd40d12b2bfe7d8ef1f5361be&oe=578A1309 This is one I'm coaching. This was taken early last season. He was a freshman. I'd been his only coach. He missed half of his 8th grade seas...
by willrieffer
Sat Apr 02, 2016 11:01 am
Forum: Pole Vault - Advanced Technique
Topic: Placement vs. Pressure
Replies: 31
Views: 45802

Re: Placement vs. Pressure

GV analyze this problem. We have two identical masses moving at the same speed perpendicular to a gravity field on a frictionless surface and in a vacuum (so that we can ignore friction losses). At the same time the both encounter horizontal planes one at 5 degrees and one at 30 degrees. Describe th...
by willrieffer
Mon Feb 29, 2016 10:11 am
Forum: Pole Vault - Advanced Technique
Topic: Getting on longer poles/moving grip up
Replies: 19
Views: 32849

Re: Getting on longer poles/moving grip up

Kirk, My model for this is again Lazero Borges. OP see the "Swing in Slow Motion" video on youtube. https://www.youtube.com/watch?v=7v6L4p0bNaE Excellent continuous motion. Notice that with Borges as with Bubka and Lavillenie that the angle of the hips tilts down towards the runway.
by willrieffer
Sun Feb 28, 2016 12:09 pm
Forum: Pole Vault - Advanced Technique
Topic: Placement vs. Pressure
Replies: 31
Views: 45802

Re: Placement vs. Pressure

From a purely physics perspective we can form an analysis of the event that takes the pole out of the analysis and simply resolves its forces into x and y forces. Once one takes this perspective then what is left is the energy relation of the CoM path where its horizontal or x velocity is relative t...
by willrieffer
Sun Feb 28, 2016 11:14 am
Forum: Pole Vault - Advanced Technique
Topic: Getting on longer poles/moving grip up
Replies: 19
Views: 32849

Re: Getting on longer poles/moving grip up

This may help. http://www.polevaultfactory.com/PoleVaultFactory/Switch_Point.html I call the distance from take off to switch point the "transit". When you move the grip up you also change the pole take off angle, lowering it, and the transit distance, lengthening it. Now, if you have basi...
by willrieffer
Sat Jan 30, 2016 10:47 am
Forum: Pole Vault - Advanced Technique
Topic: GRV: Lavillenie - From Stall Swing to World Record
Replies: 238
Views: 164669

Re: GRV: Lavillenie - From Stall Swing to World Record

Japanese pole vaulting robot. In preparation they apply differential equation analysis of pole bend and where... "We focused on the advantage of input bending moment. To compare that we conducted follow experiment. First, we experimentally compared the original buckling model treating C as cons...
by willrieffer
Wed Jan 06, 2016 3:15 pm
Forum: Pole Vault - Advanced Technique
Topic: GRV: Lavillenie - From Stall Swing to World Record
Replies: 238
Views: 164669

Re: GRV: Lavillenie - From Stall Swing to World Record

Philosophy of Argument In that the nature of this argument is at best ill defined and subject to the whims of whoever is posting, I'm going to try and define it once again. This will not be much about coaching or physics, but the nature of the discussion at hand. In Defense of the Petrov Method I sh...
by willrieffer
Thu Oct 29, 2015 1:20 pm
Forum: Pole Vault - Advanced Technique
Topic: GRV: Lavillenie - From Stall Swing to World Record
Replies: 238
Views: 164669

Re: GRV: Lavillenie - From Stall Swing to World Record

The problem is that you think there needs to be a "scientific" response to your practical observations. That's not how "science" works, or, you're working backwards. In this, the property of pendulums is proven science which YOUR observation goes against. OR, again, the point of...
by willrieffer
Thu Oct 29, 2015 12:23 pm
Forum: Pole Vault - Advanced Technique
Topic: GRV: Lavillenie - From Stall Swing to World Record
Replies: 238
Views: 164669

Re: GRV: Lavillenie - From Stall Swing to World Record

Hmmm. Let me ask this. If you were making a computer model of the pole vault could you not include the effect of gravity and the force of gravity on the pole? Because this is what you guys continually put forth here. That it isn't really important... And the compression force is going to vary as the...

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