A chart lists types of mechanical motion with mathematical formulas describing acting force, direction of force, velocity, acceleration, and path traversed. (JH)

Some recent experimental results have given a clearer sense of direction and renewed optimism for research on controlled thermonuclear reactions. (Author/DF)

Investigates a sequence of inelastic collisions resulting among three spheres, whose centers are on a line, when at the outset the leftmost sphere is propelled to the right and the other two spheres are at rest. Expressions are obtained for velocity, time, and distance variables. (MLH)

Proposes a simple and low-cost experimental method for measuring atmospheric pressure. Uses a 100mL glass and Boyle's law for ideal gases as the only theoretical requirement. (Author/KHR)

Presents an example demonstrating the quantitative resolution of the hydrostatic paradox which is the realization that the force due to fluid pressure on the bottom of a vessel can be considerably greater or considerably less than the weight of the fluid in the vessel. (JRH)

Attempts an explanation of how "ice spikes" are formed. The spikes are upward protrusions of ice that occur when water expands as it cools in a rigid container of low thermal conductivity. Describes the results of an investigation and includes color photos. (LZ)

Studies the optimum launch angle for maximizing the long jump from a kinematical point of view. (CCM)

Tells the story of an experiment conducted by Galileo and proves that a light pebble and a heavy rock travel with equal speed when dropped from the same distance and touch the ground at the same time. Indicates the importance of open-mindedness and tolerance. First published in 1939. (YDS)

Presents an experiment testing three wing angles, swept-back, straight, and swept forward, to determine which of them produces the most lift in a low speed tunnel. (YDS)

Outlines one way in which a nuclear chain reaction may be modeled in the classroom using matches. Illustrations and safety notes are included. (Author/MM)

Describes an activity in physics using a narrative about a bet between a cheerleader who claims she can lift a 300-pound football player off the ground. Includes questions, teaching notes, and solutions. (MM)

Misconceptions about forces are very common and seem to arise from everyday experience and use of words. Ways to improve students' understanding of forces, as used in recent a IOP CD-Rom, are discussed here.