This unit is designed with lower primary grades in mind. I have revamped what I have found and made it two challenges into one unit.
The first challenge is will the different types of cups sink and the second is the ones that float how much weight can they hold before they sink.
I have also included two types of small graphs the children can make using butcher paper. The first is Did the Cup Float or Sink? The second is Did the Cup Float or Sink When Weight was Added?
You will need small paper cups, small plastic cups, small Styrofoam cups and pennies to put in a small water shoe box.