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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"

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ahmedelshfie
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 « Embed this message on: May 11, 2010, 11:44:05 pm » posted from:,,Brazil

This following applet is Cartesian diver
Created by prof Hwang modified by Ahmed
Original project Cartesian diver

You can adjust the system such that one of them is moving down and one of them is moving.
You can also have them both float in the middle.

We have this kind of competition in Taiwan. Each one will play with 8 to 10 divers.
If the hole in the diver is different, the water leak out/in rate from/to the diver is also different.
Press the system slowly or quickly will have different effect on the divers.
Each diver can be controled, moving down or up by your hand. One diver can also rescue another diver.
They are many ways to play with it. I hope you can make one for yourself and enjoy the fun playing with it.
I change background of box from color balck to blue for ne near water

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
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• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
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ahmedelshfie
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 « Embed this message Reply #1 on: May 12, 2010, 12:20:16 am » posted from:,,Brazil

A Cartesian diver or Cartesian devil is a classic science experiment, named for René Descartes,
which demonstrates the principle of buoyancy (Archimedes’ principle) and the ideal gas law.

Data from  http://en.wikipedia.org/wiki/Cartesian_diver
 « Last Edit: May 12, 2010, 12:30:47 am by ahmedelshfie » Logged
ahmedelshfie
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 « Embed this message Reply #2 on: May 12, 2010, 12:29:50 am » posted from:,,Brazil

Experiment description
The Cartesian diver experiment is set up by placing a "diver"—a small, rigid tube, open at one end, such as an eyedropper—in a much larger container with some flexible component; for example, a two liter soft drink bottle. The larger container is filled with water, and must be airtight when closed. The "diver" is partially filled with a small amount of water, but contains enough air so that it is nearly neutrally buoyant, but still buoyant enough that it floats at the top while being almost completely submerged.

The "diving" occurs when the flexible part of the larger container is pressed inward, causing the "diver" to sink to the bottom until the pressure is released, when it floats again.
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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"