Float or...flop!?

In science this week, we have been learning about floating and 'upthrust'. We were thinking carefully and curiously about why some objects sink and others float. We tested an empty plastic bottle in a huge container of water and voted on whether we thought it would sink or float! We then tried out some of the wonderful boats made by the children as part of their homework. 

We discussed this lots and recorded some lovely, scientific work in our books. I wonder how many can remember what happens with submarines?