A non Newtonian fluid is one whose flow properties cannot be described by a single constant viscosity.
An easy one to make is cornstarch and water. Hit it hard and it becomes solid, soft and it is a liquid meaning you can run across as if it were solid it but if you stop you sink in like it was liquid.
This video shows what happens if you put a tray of it over a sub woofer.
Comments
you can run across as if it were solid it but if you stop you sink in like it was liquid.
Brainiac did this with custard and mythbusters with corn starch I think.