Toni has four blocks of wood. The four blocks of wood are all the same size and weight. Some are smooth and some are rough. How can Toni find out which block of wood is the smoothest?

At school you have looked at different materials. You have done simple tests on materials. Things we can test, like strength or stretchiness, are called properties. How can you test which material is the strongest or which material is the stretchiest? Can you plan how to test different materials?