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For those of you with a passion for practical jokes make TWO batches
of cornstarch- water mixture. Make the demo batch you use properly
thick and place it in a wide shallow pan. Bring the class up to see it
and show them how sloppy and thin it is and have them feel it harden
when squeezed. Unexpectedly slap the mixture, most will recoil in
horror expecting to be splashed - they will not.
Now to a very deserving student give the second batch, which of course
has too much water - it can be worth cleaning up the mess.
Have Fun
For a variation on the theme - use mineral oil INSTEAD of water.
Make a similar consistency and watch the viscosity shoot up when you
bring an electrically charged object near the flowing liquid. A
rubber balloon will 'solidify' the stuff.
I cannot wait to try this! Is there a reference on the physics?
Scott
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Scott Goelzer
Physics Teacher
Coe - Brown Northwood Academy
Northwood NH 03261
603-942-5531 ext43
sgoelzer@coebrownacademy.com
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