Tuesday, 11th November 2008
We have a plastic cup. 
We half filled it with rice, then put a bouncy ball in the cup and filled the rest of the cup with rice. Next we gave the cup a shake and had to guess whether the ball would go to the bottom or top of the cup, or stay where it is when the cup is shaken. When we shook the cup, the ball ended up on the top.
This is because the little rice pieces rush in to fill any air spaces caused by the shaking. This means that the ball ends up on the top each time. This explains why all the big pieces of cereal are always at the top of the cereal box when we open it.
We half filled it with rice, then put a bouncy ball in the cup and filled the rest of the cup with rice. Next we gave the cup a shake and had to guess whether the ball would go to the bottom or top of the cup, or stay where it is when the cup is shaken. When we shook the cup, the ball ended up on the top. This is because the little rice pieces rush in to fill any air spaces caused by the shaking. This means that the ball ends up on the top each time. This explains why all the big pieces of cereal are always at the top of the cereal box when we open it.
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