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. As both strips become negatively charged when rubbed with wool they will repel each other when they are in close proximity.
Categories: Teacher Demonstration
The International Astronomical Union classifies solar system bodies into three categories: planets, dwarf planets, and small solar system bodies (including comets, asteroids, and... read more
Categories: Lab/Student Activity
There are eight planets in the solar system in two distinct groupings. The four inner terrestrial planets (Mercury, Venus, Earth, and Mars) are very small and relatively close together. The outer... read more
In this activity, students mix a given quantity of salt with a fixed volume of water. Mass and volume measurements are made before and after mixing to determine if these quantities change. Students... read more