I beleive that sway is simply obeying a natural law of motion. If a car hits a tree or a solid object it tries to climb the tree and will then drop verticly to the ground. In the Waltz we need to stop our movement, to use the remaining energy, we sway, so that we can lower in a verticle manner. Otherwise we keep on going. Have I got that right??.

its a natural movement. Another example would be a plane sways while turning.

At this moment I am intersted in stopping the speed of the movement so that I can lower verticely. After a dash down the floor in the Quickstep and into a Spin Turn is one.
If swing is moving from a fixed point and the fixed point also moves. Then there is a time when the fixed point stops moving therefore we introduce sway.

"If swing is moving from a fixed point and the fixed point also moves. Then there is a time when the fixed point stops moving therefore we introduce sway."

First, waltz swing is moving from a fixed point which DOES NOT MOVE during a given swing. You dance one complete downswing-upswing ccyel about a fixed point, then get a new fixed point for the next swing. Think about tarzan - swings on a vine from one tree, then swings on the vine from the next, but each vine remains fixed to the same tree it started on.

Then, swing and sway are not perfectly coordinated. Consider that downswings do not have any say. Swing is the path of the body, while sway is an incline of the body - the body can move in a swing path, without have any sway.

However, it is indeed generally beneficial to use some sway on the upswings. For one thing, sway lets you extent your free foot further down the floor, without it getting ahead of your body, because the incline of the body means that a point "under" the body (along its axis) will be further down the floor than "under" the body with respect to gravity is.

"its a natural movement. Another example would be a plane sways while turning."

Yes, but for a complete different reason than a dancer does.

An airplane sways (banks) so that the lift produced by its wings is no longer simply up, but now directed up and towards the inside of the turn. This pushes the plane towards the center of the turn, making the flight path curve.

A dancer on the other hand sways because the lower body moves faster than the upper. This doesn't have much to do with turn - you can dance quite a bit of sway on a non-turning promenade for example.

Wen dancers do turn, they do so by first rotating their body, but the direction of travel is not yet changed. Then when their swing cycle reaches its highest and slowest point, they take their next, lowering step in the new direction towards which their body was previously rotated. To a pilot what a dance does is a skid turn, and pilots have an instrument to avoid doing this. But a dancer is not an airplane - we are supported by feet acting vertically against the floor, rather than wings which provide support in whatever direction they are banked to.

What is a coordinated turn for an airiplane - nose always pointed into the movement - is a mistake for a dancer. What is a skid turn for an airplane - pointing to the new direction while still moving in the old, otherwise known as skidding - is correct for a dancer. Different mechanics, different techniques.

Anonymous. You've done it again, All of that just to agree with the previous writter. It would seem you are unable to put forward a sensible suggestion, but only sit back and pick.. Just for your information it is a natural law of motion. Anything that turns has sway even when we turn around a corner the sway might not be seen but it is there never the less.

"Anonymous. You've done it again, All of that just to agree with the previous writter. It would seem you are unable to put forward a sensible suggestion, but only sit back and pick.. Just for your information it is a natural law of motion. Anything that turns has sway even when we turn around a corner the sway might not be seen but it is there never the less."

If you are so sure of yourself, then explain why airplanes and cars sway in opposite direction when turning a corner?

Airplanes sway into the turn, and cars sway out of it (unless the roadway is banked)

Of course airplanes only sway into the turn if flown to do so - cross control and they can sway out of the turn. Or turn without sway.

It is not a law of motion at all - it is a result of certain methods of turning which will not be present in other methods. Spacecraft for example do not sway when they turn.

Anonymous. Get sensible will you. The car has srings and shock absorbers. The last time I flew the wings didn't have any. Neither have you.

"Anonymous. Get sensible will you. The car has srings and shock absorbers. The last time I flew the wings didn't have any. Neither have you."

Springs and shock absorbers have absolutely nothing to do with it.

What you haven't figured out yet is the source of the sideways force used to create turn.

Anonymous. Being that most people have access to a car. I think you might have a few conradictions there. Did you know when going around a bend. That the speed of your car will determine where you exit. If you were a racing car driver you might be able to alter that line. But then you would be an expert driver.