1 We put 2 tablespoons of cornflour into our bowls 2 Next we gradually added water which was coloured with food colouring to the cornflour 3 Then we stirred the mixture very slowly ID: 533455
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Slide1
Cornflour slime!Slide2
1. We put 2 tablespoons of cornflour into our bowls.
2. Next, we gradually added water (which was coloured with food colouring) to the cornflour.Slide3
3. Then we stirred the mixture very slowly……………..Slide4
4. We put the slime into our hands…………..Slide5
5. We `punched` it and poked it……………………………Slide6
6. We squeezed it……………………………………….Slide7
7. We picked it up…………………………………Slide8
We found that the `slime` behaved very strangely.
It looked liked a fluid. If we gently moved our bowls from side to side it appeared to flow like a fluid.
When we stirred it gently, it moved like a fluid.
HOWEVER……………………………………………….
If we stirred it more vigorously, it provided resistance and began to act more like a solid.
When we picked it up and handled it quickly i.e. squeezing it or rolling it, it also behaved more like a solid.Slide9
Cornflour slime is a special type of fluid
……
It doesn’t follow the usual rules of fluid behaviour.
When pressure is applied to the slime, it viscosity (
the resistance to flow
) increases and the cornflour becomes thicker.
At a certain point, the slime actually seems to lose its flow and behave like a solid.
Cornflour is an example of `shear-thickening fluid`.