This webpage is simply an active calculator of buoyancy. It allows changes in mass, apparent mass, volume or density to explore variations. This site would be an excellent resource for any biology, chemistry or physics...

This site by Charles and Ray Eames provides a series of multimedia resources that illustrate the scale of the universe. Visitors can view stills from the Charles and Ray Eames video "Powers of Ten," which zooms in and...

This website from Kathleen Cummings Dominguez at the Illinois Institute of Technology provides a lesson plan on the concepts of friction. It describes a lesson plan which will engage students in active classroom...

This is a lab designed to teach students to recognize that weight and surface affect friction and not surface area. The experiment uses wood blocks on a variety of surfaces.

Created by David P. Stern this is the first of three linked web pages. The one listed introduces the concept of mass and the question of how it may be measured without recourse to gravity, e.g. in the weightless...