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I pray that you people have metal detectors at all entrances. As the
VP @ North Salinas HS whose main job was dicipline said, 'they may
look like adults, but they're not."
bc
Tim O'Donnell wrote:
Scott - You're a "cruel" teacher, but I am sure one of my students
will have this happen to them! - Tim
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
--
*****************************
Scott Goelzer
Physics Teacher
Coe - Brown Northwood Academy
Northwood NH 03261
603-942-5531 ext43
sgoelzer@coebrownacademy.com
*****************************
Tim O'Donnell
Instructor of Physics and Chemistry
Celina High School
715 East Wayne Street
Celina, Ohio 45822
(419) 586-8300 Ext 1200 or 1201
odonnt@celina.k12.oh.us
"Chance favors the prepared mind." - Loius Pastuer