If you need a unit to grab those reluctant learners and "Power" them up, you can't do better than force and motion! It's filled with experiments, plus lots of movement and action. It's everything kids could want! Get links to everything you need on this post!
States of Matter - An interesting program discussing different materials and how they change. Looks for example at why normal engine oil is no good in extremely cold temperatures. About 20 minutes long!