Even though density is taught in middle school, high school students often struggle to understand that the density of a substance is consistent regardless of amount. This is because many high school students know density = mass/volume, but do not have the conceptual understanding necessary to explain density-related phenomena. The scaffolded…

Problems concerning energy shortage are presented along with possible solutions. Three important areas of concern are (1) energy-origin and uses, (2) environmental effects of energy use, and (3) resources and new sources. (DF)

Discusses the theory, formation, and properties of the black holes, nature's dark stars. The connection between black holes and thermodynamics is also discussed. (HM)

Describes an experiment in which the final speed of a toy car is predicted by measuring the elastic potential energy stored in its spring at the start and the energy lost to friction during the run. Conservation of energy is discussed and the necessary mathematical formulas are presented. (BC)

Gives a brief descriptive review of the life of Albert Einstein, his scientific papers and his valuable contributions to physics. (BA)

Explains a series of laboratory activities which employ a microwave oven to help students understand word problems that relate to states of matter, collect data, and calculate and compare electrical costs to heat energy costs. (DDR)

Violins, earthquakes, and the "singing rod" demonstration all have something in common--stick-slip frictional motion. The application of stick-slip friction can be extended to a ringing wineglass, exotic percussion instruments, car racing, and the latest research on the interplay between surfaces at the atomic level. These examples all involve two…

In this article, the author features "the sidewalk project" in Littleton High School. The sidewalk project is a collaboration of more than 40 high school physics students, 10 local mentors, and a few regional and national organizations who worked together to invent a way to heat a sidewalk with an alternative energy source. The project, which…

Examines the interest level of Chilean students in physics and technology in light of unacceptable performance levels in these areas. Relevant thermodynamics problems applicable to students' daily lives generated more interest. Discusses the importance of presentation to student acceptance of the curriculum. (AIM)