Describes a rocket propulsion demonstration utilizing a child's wagon and a carbon dioxide fire extinguisher. (CP)

Provides a more exact solution to the motion of a pendulum through use of elliptic integrals and the perturbation theory of Kryloff and Bogoliuboff. (CP)

Details early work on laws of motion, particularly inertia, through the use of Galileo's writings. (CP)

Utilizes a rotating table and strobe photographs to provide students with a direct record for quantitatively analyzing rotational effects. (GS)

Describes an approach wherein the student selects a single type of simple item and uses it as the basis for making a physics demonstration. Provides an example that uses a cheese dish in eighteen different demonstrations. (GS)

Describes the result of dropping objects of similar size and shape but of differing weight through air. Compares ideas on motion of Galileo and Aristotle. (GH)

Describes an easily-implemented experiment in which a moderately complex relation between dependent and independent variables is involved. (Author/GS)

Describes activities involving the use of playground equipment (such as swings and seesaws) as a means of teaching elementary school children some basic principles of physics. (JR)

Describes an interesting, inexpensive, and highly motivating experiment to study uniform and accelerated motion by measuring the position of a car as it crashes into a rigid wall. Data are obtained from a sequence of pictures made by a high speed camera. (Author/SLH)

Mathematically shows that in principle a spaceship could travel eight light years in ten earth years, with the passengers arriving 4.6 years older than when they left earth and having experienced an acceleration induced effective gravity of one g for the entire trip. (MLH)

Describes a method of time-of-flight determination utilizing a sound-actuated switch, an electronic flash, and a loaded camera. (GS)

Describes a calibration technique for a small motor which, when driven as a generator, can be used for a speedometer. The generator output can be fed to an oscilloscope to provide a sweep in which the vertical axis is velocity and the horizontal axis, time. (GS)