Describes how liquid nitrogen is attracted to the poles of neodymium magnets. Nitrogen is not paramagnetic, so the attraction suggests that the liquid nitrogen contains a small amount of oxygen, which causes the paramagnetism. (MVL)

Presents John Collier's "Problem-Solving Loop" as a structure for finding the most acceptable solution to any problem. Describes a project that uses the problem-solving loop to analyze some problems outside the classroom related to kinematics and dynamics. (JRH)

Combined free response questionnaire and interview procedure are used to probe students' ideas regarding how they believe they see both luminous and nonluminous objects and how they think they hear source of sound. From large sample of students studied (n=1901), prevalence of ideas in different age groups is compared, and progression can be seen.…

Discusses the meaning of velocity in the Lorentz force law and to what the velocity of the charge is relative. Provides a brief summary of the history of the magnetic force. (23 references) (MDH)

Describes two high school courses, "Chemistry of Technology (Chem Tech)" and "Physics of Technology (Physics Tech)," that emphasize multidisciplinary learning through applicative, hands-on activities. Provides course descriptions, lists the advantages of using a unified science-technology model, and discusses limitations of…

Describes "The Mechanical Universe," a video series aimed at high school physics teachers. Author asserts that the educational infrastructure must be strengthened to the point where science can be taught gradually, throughout the school years and beyond. Teachers need to become better by increasing mastery of the subject and by better…

Discusses the hydrodynamic reasons why a riverbed meanders through a plain. Describes how water movement at a bend in a river causes erosion and changes in the riverbed. Provides a mathematical model to explain the periodic shape of meanders of a river in a plain. (MDH)

Authors describe some alternative conceptions held by Portuguese physics students about mechanics and compare students' scientific conceptions with the evolution of historical ideas. Authors contend that teacher knowledge about the history of science can facilitate teaching for conceptual change in physics. (over 20 references) (Authors/PR)

Proposes an adaptation of a television game show as a method to review at the end of a unit or semester. Describes procedures to conduct the game. (MDH)

Two different methods of measuring the temperature of an incandescent lamp at various voltage levels are described. By observing the color produced at a particular voltage levels, the lamp's color as a function of temperature can be determined. Needed equipment include a variac, a voltmeter, and an ammeter. (KR)

Evaluates the technical efficacy of the V-Scope in measuring motion produced by a phonograph turntable, a template furnished by the manufacturer, a free-fall apparatus, some pendula, a gyroscope, and three air tables. Concludes that the V-Scope gives excellent results and is easy to use. (MDH)

The author asserts that the benefits of animal dissection can be experienced by dissecting electronic devices. Students can dissect an electrical device and write a lab report which includes detailed descriptions, drawings, and sometimes electrical components mounted on a display board. The electronic devices for this activity are brought from…

Various modes of reflection are classified and practical examples of devices, such as cat's eyes, are discussed. Typical light rays are traced through several systems, providing exercises with varying degrees of difficulty. Corner-cube retroreflectors, glass spheres, reflecting luminaries, light concentrators, parabolic reflectors, and off-set and…

Outlines the highlights of experiments that allow students to trace the historical development of our understandings of cosmic rays. The experiments provide for two outdoor fieldwork experiences, indoor laboratory work, and an opportunity for a group of students to show originality and initiative. (ZWH)