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Walking/Running
Posted by sqq
11/22/2006  7:21:00 AM
The difference between running and walking

Walking:
-Center of mass moves in circular arcs.
-Center of mass is highest when directly over supporting leg.

Running:
-Center of mass moves in parabolic arcs.
-Center of mass is lowest when directly over supporting leg.

Previous are from: uw.physics.wisc.edu/~reardon/Physics%20of%20Running.pdf

Does center of mass of the body move in parabolic arcs during slow dance steps center of mass being lowest when directly over supporting foot and highest on top of the arc on full stride?

Does during continuous straight slow dancing steps the mass off the body move in parabolic arcs one after another being lowest at the ends of the arcs when over supporting foot just before propelling and most weightless highest on tops of the arcs on full stride?

A quick-quick step moves too in one parabolic arc. Center of mass is on top of the arc most weightless between quicks when feet pass or when moving foot has closed half-way towards the supporting foot and lowest at the ends of the arcs when charged for the first quick and after second quick when charged for next step.

An interesting site of walking: http://www.awn.com/qas/60.html
Re: Walking/Running
Posted by Anonymous
11/24/2006  9:42:00 PM
SQQ: the answer to your question is this:

In the swing dances, the vertical component of the center of mass movement does not cycle on a step-by-step basis, but instead occurs across cycles of typically three or more steps. Just looking at one step in isolation is not enough - you have to look at the group. Chances are you will find that the highest alittude is over a standing foot, and the lowest between feet between 3 and 1, though for some of the italians it might be just before they arrive over step 1.

And for tango of course the center of mass altitude is supposed to be constant.

Discovered something interesting btw... if running down the street carrying something you don't want to bounce, run with tango action...
Re: Walking/Running
Posted by Anna
11/24/2006  10:36:00 PM
Anonymous. Is it not a fact that the Italians get much more rise doing it their way than those who stick to the old way. And are they nearer to the correct defintion of how it is actually printed.
Re: Walking/Running
Posted by Anonymous
11/25/2006  5:27:00 AM
"Anonymous. Is it not a fact that the Italians get much more rise doing it their way than those who stick to the old way."

Quantity is not an absolute virtue.

"And are they nearer to the correct defintion of how it is actually printed."

No. Because they continue lowering until they start rising. Nobody is literally following a simplisticly literal reading of the book, because everyone continues downard during the early part of step 1. It's merely a question of how long they continue downwards - do they reacht the low point of the swing between the positions of step three and step one, or only as their body arrives over step one?
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