This is a simple, yet extremely effective model of human lungs. Students are able visualize how the lungs, thoracic cavity and diaphragm work together to facilitate inhalation and exhalation. This model can be prepared before class to be used as a demonstration and re-used year after year. Alternatively, this demonstration model could be turned into a student activity and partners could create their own model of the lungs.
In this demo, two polyethylene strips are charged on one end by rubbing with wool. One charged strip is then mounted on an evaporating dish and the other charged strip is used to make the dish spin.... read more
Students watch the teacher demonstrate the OJ powered clock. The teacher guides students to wonder what they could change to make the clock work. They do some brainstorming and then the next period,... read more