The Beauty of Water 04/03/20
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PERSPECTIVE!!!  WATER!!!  F-U-N!!!!
The Beauty of Water, Physics, and Flow
Water WANTS to flow and it WANTS to keep flowing but it needs a difference in speed to get going.   The plate in this video is like your hand moving through the water at the top of your stroke.  When it starts moving at the top of your stroke, it starts moving the water right next to it, but doesn't move water farther away, and somewhere in between those two places the water starts spinning and turns into something like wind pushing against your hand.  Only after you create this "water wind" do you have something to hold onto to climb down the pool.
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The water in front of the plate is being forced around the sides and the water behind the plate being sucked forward as your hand is doing it's pull.  Getting the water to spin is the more important part, after that just don't get in it's way and it will (mostly) keep spinning!
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This spinning doesn't just happen on the surface of the water where we can see the "dips," it's happening everywhere the plate created spin with it's movement, ALL around it!  The water reacts the same way to your arms and legs, they are just acting as "plates." Look what happens when she adds the food coloring...
The half ring you see is not a wave.  What's the difference between a vortex and a wave?  Do you see now why I want you to make Vortices and not just waves?  Pushing water around is NOT moving the water.
Beautiful Vortices, so pretty.
I think you're starting to see what I'm talking about when I say goal is to move the water.  Splashing and making messy water is not the same as moving the water in a pattern you can control.  You want to "spin" the water, but remember that in order to create the vortices, you have to start with STILL WATER!
 If you crash into the water at the front and make a water mess, there's nothing you can do with this water, it's "dirty" water.  But if you enter really cleanly and then go FORWARD and let any bubbles you captured fall off your hands and go find the peaceful still water out front, you will have a chance to spin it.  Look at the 4 videos at the top of this page and tell me what you see as it relates to "clean" and "dirty" water:  https://www.irisa.fr/vista/Themes/Demos/MouvementFluide/vapeur.html
The arrows point in the direction of where the water is going, the length of the arrow is how fast it's going there.
Describe the water above, just tell me about what you see.
Vector Field in Water
Swirling Water
Tell me about the pictures above:
Now here is a person swimming freestyle.  I drew on it to help you find the swimmer.
Now instead of looking at the swimmer, look at the water.
The blue represents high pressure water, this water feels solid.  The light green has less pressure in it, the darker green has the least amount of pressure.  Tell me about what you see in this picture with regards to the water.
Now let's watch how the water moves to a "Vortex Ring" in the pool, Bubble Rings!!!  (you can stop watching after the Pretzel ring)  This video is to just get you more familiar with water spinning.
The Pretzel ring, super cool.  He said he made using an impulse of acceleration.  Why did he, and why do you, need acceleration in order to get the water to spin?
You can't see it, but it's powerful!  We make "Water Wind" so I wanted to explain air wind to you.  (You can stop after the cartoon guys are done talking)
Wind has mass, water has MORE mass.  When those molecules get going they create pressure that you can feel.  Even though you can't see pressure, you can feel pressure, and it's because of the force of the molecules pushing against you.  You can measure it, too, as you will see in the next video.  So when you have that feeling that the water is "harder" or "softer" it's not something you are making up.  There really is a way to make the water have more and less pressure to use.  Why does this matter to Fast Swimming?
Did you see that when the air moved in it's convection cell circle, it caused wind?  And when the earth spins, the land acts like the plate and space acts like the water far away, and the wind in the between acts like the spinning water vortex.  Same same?
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They showed you different kinds of winds depending on where the spin was on the globe (at the poles, half way to the center, or along the equator).  The different surfaces at these places will create different winds, just like in our strokes the different shapes of our hands and feet create different "water winds."
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And wind can be in a vortex, too, like a Tornado.  We want the fastest possible "water tornado" so we can use create the most pressure at our catch as possible.  We want to Flex our muscles on this pressure so we can have something to hold onto and climb forward on.  This pressure makes the water act more like a solid and less like still air.  You can't climb air.
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"Water Winds" are invisible but powerful, and this is why Megan says all the time to "Use the Force."  You can't see it, but you have to create it, guide it, and then use it.
My favorite quotes from this scene are:
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