McREL International
Mc Rel: Whelmer #10 Learning Activity: Singing Rod
An easy to do activity that investigates the simple observable properties of sound waves. The activity is presented in lesson plan format that meets NSES standards.
Science Education Resource Center at Carleton College
Serc: An Electrostatics Puzzler
A simple demonstration will tests students' understanding of electrostatics. This puzzler stumps even experienced physics educators and is sure to entertain a physics class. A plastic rod is charged using a piece of animal fur. The rod...