Describes an investigation involving acid hydrolysis and using both volumetric and kinetic techniques. Presents examples of the determination of the rate constant and its variation with temperature. (GS)

Describes a model in which a steel ball bounces in synchronism with a vertically oscillating piston. The period of oscillation can be varied over a 3:1 range with the amplitude kept constant. As the period is increased, the ball bounces higher, contrary to the intuition of most observers. (Author/GS)

Describes a survey of experiments including a stringed instrument experiment and discusses other instructional uses of cartridges. Includes information on the characteristics of cartridges. (GH)

Describes a take-home experiment requiring only running water, a flat surface, a fluorescent light, and a ruler. Suggests elaboration of the experiment. A photograph is included. (GH)

Describes elementary school activities and questions which center on the life cycle of the woolly bear caterpillars. (MLH)

Discusses ways in which a taffy candy bar can be used to illustrate, by analogy, deformations of the earth's crust under compressive stress. (MLH)

Describes a physics laboratory experiment for nonscience majors intended to illustrate indirect experimental methods of sciences treating objects too small for sensory observation. The student explores and attempts to identify an object in a closed container, using provided experimental tools and small openings in the opaque lid. (MLH)