Describes how Newton's three laws of dynamics are taught in high school in the Soviet Union. Rejects introducing Newton's second law as an equation defining mass as a proportionality constant. Shows how the concept of mass can be introduced independently of Newton's Law. (GA)

Develops a theory to explain the effect that, when a current passes through a ball bearing, it can act as a motor. The motor can run in either direction on both DC and AC and can be self-starting on DC. Presents some experimental results in support of the theory. (Author/GA)

A coupled-oscillator system is given which is readily set up, using only household materials. The normal-mode analysis of this system is worked out, and an experiment or demonstration is recommended in which one verifies the theory by measuring two times and four lengths. (Author/GA)

A Hamiltonian for the time-dependent damped and forced harmonic oscillator is derived. A simple time-dependent linear canonical transformation transforms the Hamiltonian to one whose solution is readily obtained. The wave function for the corresponding quantum mechanical problem is given. (Author/GA)

This article shows that the centrifugal force in a rotating reference frame possesses the property that the brachistochrone and tautochrone are identical. In this system the force is repulsive and proportional to the distance from the force center. (Author/BB)

Explains how the spherical pendulum could be used to observe nonreentrant orbits, and shows, using theoretical analysis, that for small displacements the elliptical orbit will precess at a rate proportional to its area. (GA)

Gives a perturbation analysis to recurrence effects of the spring pendulum. The recurrence depends on two conservation laws which determine the motion in an intermediate region; oscillations outside this region are unstable and must return. Gives the relation to Fermi-Pasta-Ulam problem together with the explicit solution. (Author/GA)

Calculates energy expenditures for the activities of running and bicycling and discusses the heat dissipative perspiration system of the human body. (CP)

Explains that the larger value of g at the poles is not due only to differences in the radii of the earth, but that other factors are also responsible such as the rotation of the earth and the increase in the earth's density toward its center. (GA)

A discussion of levers, moments of inertia, fulcrums and forces involved in the action of boat rowing is presented. (CP)

Addresses the problem of the optimum angle at which a putter should release the shot in order to achieve maximum distance. (BB)

Demonstrates that the assumption of a single-frequency wave does not eliminate the effect of frequency dispersion upon energy transport velocity nor upon energy density. (Author/SL)

Demonstrates that the standard deviation of the position probability of a particle moving freely in one dimension is a function of the standard deviation of its velocity distribution and time in classical or quantum mechanics. (SL)

Discusses an alternative to the mean free path method of presenting the treatment of transport processes in a physical chemistry course. (SL)

Describes an experiment for determining the acceleration of a projectile. (SL)