The temperature at which the onset of coordinated segmental motion begins is called the glass-rubber transition temperature (Tg). Natural rubber at room temperature is a good example of a material above its Tg. Describes an experiment examining the response of a typical polymer to temperature variations above and below Tg. (Author/JN)

Areas considered in this discussion include: activation/modulation of movement; control of motoneuronal discharge by excitation/inhibition; neural generation of movement synergies (considering interaction of central/peripheral elements, phasic gating of reflex effects, and neuronal organization of central pattern generators); protean nature of…

Discusses physics of bicycles, presenting a model of the forces acting on the bicycle and its rider. Topics considered include maximum speed coasting down a hill, maximum speed on the level, and maximum speed up a hill. This material is suitable for homework problems, independent study, or regular class work. (JN)

Activities are provided for calculating speeds of celestial bodies. These focus on how fast earth rotates on its axis, how fast planets travel around the sun, and how fast the solar system is traveling with the Milky Way. (JN)

Describes an apparatus to be used in a visual presentation of simultaneous, independent motions and their resultants. The apparatus is best suited for representing a boat and stream, but could be modified to represent a plane in a moving air mass. (Author/DS)

The author reviews recent literature dealing with teaching autistic children acceptable behaviors. Using E. Ornitz and E. Ritvo's description of autism, teaching procedures to overcome weaknesses in perceptual difficulties, bizarre movement, and problems in relating are discussed. (CL)

Introducing a four-vector strain and a four-force stress, Hooke's law is written as a four-vector equation. This formulation is shown to clarify seemingly paradoxical results in connection with uniformly accelerated motion, and rotational motion with angular acceleration. (Author/JN)

Demonstrates that the observed path of a particle in quantum mechanics is a fractal curve with Hausdorff dimension two. (Author/JN)