This site, from UCLA's Department of Physics, contains web and in-class demonstrations of physics concepts in the topic areas of mechanics, harmonic motion and waves, electricity and magnetism, acoustics, optics, matter...

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.