Making experiments with kids is fascinating. And the'd love to make quick sand. Let's see how it works.
You will need...
Half a cup of water
1 cup of maize cornflour
A plastic container
a) First, mix the cornflour and water in the container to make your own instant quick sand. Remember not too solid ok?. Then, stir slowly and drip the quick sand to show it is a liquid. Stirring it quickly will make it hard, so you'd better do it fast. Remember that quick sand is messy, try to play with it outside and don’t forget to stir just before you use it. You just need t stir instant quicksand just before you use it. It's always like that!
The phenomena explanation
If you add just the right amount of water to cornflour it becomes very thick when you stir it quickly. So, Stirring slowly allows more water between the cornflour grains, letting them slide over each other much easier. Moreover, if you poke it slowly it doesn’t mix up the mixture in the same way, leaving it runny. It works in much the same way as real quick sand.