This site, from Channel 4 Learning, covers a wide range of topics in physics and explains them in a way that younger students can readily understand.  Study electricity, sound, light, friction, and magnets.  Each section includes the essential idea accompanied by an illustration.  There are also experiments for home or school, vocabulary, a quiz, worksheets for teachers, and an image bank to further illustrate each concept.  The directions for the activities are easy to follow and use common, inexpensive things.  Visit www.channel4learning.com/sites/essentials/science/physical/index.jsp

courtesy of netTrekker