Surface tension explains why dew drops are spherical, why a stream of liquid separates into droplets as it falls, and why some heavier-than-water objects can float on the surface of a still pond. In the absence of gravity, surface tension can be a powerful effect, as...

This lesson gives instructions for a simple rocket that can be constructed out of a soda bottle and some alcohol in a matter of seconds. I also explain the basic principles of rocket propulsion (Newton's 3rd law) and offer some suggested design refinements, including a...

This lesson describes and explains the common effects of static electricity. It provides instructions for making a "pith ball" to study static electric effects from different materials, and includes data on many common materials.

This lesson is a brief guide to exploring magnetic materials. It lists a variety of everyday metals, their magnetic properties, and where to find them. Students are encouraged to locate as many examples as they can, and test them with magnets. A checklist for students is...