Sink or Float

This week in science we tried to figure out why things float. First we made some predictions- we thought that things might float because they're flat, round, heavier than the water, light, have air inside, or because "they don't have a lot of stuff inside them." To test our theories we used a variety of fruit. To our surprise many of the the fruits floated except the grape and the mango. Afterwards we went back and reflected on our original ideas. We talked about some of the reasons that things float like shape, weight, and density. 

In the picture below students are holding up sink or float cards to predict what a piece of fruit will do.