There is a Dr. Seuss book, Bartholomew and the Ooblek, which gives the name to the strange mixture we made in class Tuesday.
I passed round a five gallon bucket half filled with corn starch and had the students write in their lab notebooks what they thought it was. I recorded the tallies which included baking powder, flower, and corn starch.
I think asked them to guess what would happen when they mixed it with water.
Lab groups of three were organized where one person had to have their phone in the class phone caddy, one had to wear green and one had to have hair longer than 10 centimeters. There was a competition between the classes and there was a 20 second addition if one of the persons did not meet the criteria. Seventh period won in 74 seconds (includes a 20 second deduction).
We then went outside to test. Here are some of the shots:
When we got back in I told them about it being a non newtonian fluid. It is liquid at normal atmospheric pressure and becomes a solid when squeezed or pounded with a hammer.
We then had a contest to see which two people (the third member of the group videoed) could toss their ooblek ball back and forth the furthest distance. They face each and tossed, stepped back and tossed again. Zach and Tanner won with a distance of 25 meters!
Second place was Audrey Claire, Mckenzie, and Abigail.
Check these references out:
- http://blogs.howstuffworks.com/brainstuff/how-oobleck-works.htm
- http://www.exploratorium.edu/science_explorer/ooze.html
- https://en.wikipedia.org/wiki/Non-Newtonian_fluid#Oobleck
- http://blogs.scientificamerican.com/cocktail-party-physics/walking-on-custard-fun-with-non-newtonian-fluids/
We are going to fill a wading pool with ooblek and walk (quickly) on water.
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