It’s show time for eighth grade physical science students after a week of designing, building, and refining Conversion Contraptions. The contraptions are fun combinations of moving parts that use many forms of energy and many conversions of energy. It’s the culminating project for a unit on energy and energy conversions. As preparation for this project, students do labs during a unit that applies their knowledge of energy to toys. Students also analyze a top, slinky, a light ball that plays music when the circuit is completed, and any other toys that can demonstrate energy conversions.