Separation of a mixture: physical properties of matter, the fact that matter may differ from other matter in a variety of ways, students will examine three different solids individually and observe some differences in physical properties.
Racing Rings consists of three rods one each of copper, aluminum and PVC, Ring magnet is dropped down the PVC rod, it falls unobstructed, Two metal rods create an induced magnetic field to that adds resistance to the rings travel, metals are different, they fall at different rates