The program is one of many simulations by PHET, designed and developed by the University of Colorado.
You can download a worksheet Density and Buoyancy for this game.
In addition to the game it would be great to use real cubes of different materials in an aquarium with real water. The students can make their own mystery cubes, of which the appearance does not give away the type of material used. Cubes should also be made water proof.
|Hardware|| PC, iPad