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Squeeze some in your palm and it will form a tough glob. But the second you release it, oobleck trickles down over your fingers in a slurry. Oobleck is actually a pretty simple mixture of cornstarch and water. Its common name which I later learned is not what all kids call it comes from a Dr.
But get them together and they form a non-Newtonian fluid. To really understand these materials, we need some knowledge of their opposite — that is, a Newtonian fluid. British polymath and Enlightenment hero Isaac Newton studied lots of things: optics, gravity, waves, mathematics, astronomy, history, religion and alchemy and so on. Then in his spare time, he investigated how liquids flow and thus got a whole branch of fluid dynamics named for him.
Newton observed how common liquids, such as water, flow the same regardless of how much stress you subject them to. Push a stirring stick into a cup of water and swish it around. Pretty simple, yeah? Many liquids that we interact with on a regular basis work this way: things like water, milk, oil, or juice.
These are non-Newtonian fluids; substances whose viscosity changes based on how much pressure you apply to them. For instance, tip a tub of thick yogurt upside-down and it will slowly ooze out. But shake the yogurt for a while first and its viscosity will decrease, allowing it to pour much more easily. Things like toothpaste, conditioner, and ketchup are another example. They usually sit like a custardy solid at the bottom of their container.
Using a material that doesn't behave according to the 'rules' is a great way to get students to explore what they already know about the difference between solids and fluids. Investigate the properties of a non-Newtonian fluid. Per Pair or Group: cornstarch water tub mallet food colouring optional.
What do fluids and solids do, what determines their shape, and can they be compressed? How is Oobleck like a fluid? How is Oobleck like a solid?
Teacher tip: For coloured Oobleck, add food colouring to the water before you mix it with the cornstarch. Ellen Oobleck Taken to Extremes. Details Activity Length 30 mins.
Objectives Investigate the properties of a non-Newtonian fluid. Describe the properties of a solid and a liquid. Materials Per Pair or Group: cornstarch water tub mallet food colouring optional Key Questions What do fluids and solids do, what determines their shape, and can they be compressed? What To Do Dump 3 or 4 boxes of cornstarch into a shallow container.
Add about a litre of water, slowly, and mix thoroughly.
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