This article focuses on the mechanisms of the human brain which bring about body movements. Included is a discussion of the way in which the brain and spinal cord issue commands and receive signals. (Author/SA)

Constructs a theory, using Aristotelian lines of thought, to explain Galileo's assumed experimental results that all bodies fall at the same rate, ragardless of their weight. (GA)

Shows how the quantization of a Hamiltonian which is not canonically related to the energy is ambiguous and thereby results in conflicting physical interpretations. Concludes that only the Hamiltonian corresponding to the total energy of a classical system or one canonically related to it is suitable for consistent quantization. (GA)

Investigates the behavior of a simple pendulum attached to a fixed point inside a satellite moving in a circular orbit about the earth. It is found that the number of equilibrium positions depends on the length of the pendulum and the location of the point of attachment. (HM)

Discusses the physics involved in a falling elevator and whether an occupant of a falling elevator will be unharmed if he jumps up as the elevator crashes. (MLH)

The occurrence of dyskinetic movement disorder and its co-occurrence with stereotypic behavior among adults with mental retardation were studied in 98 adults with mental retardation. Results indicated that stereotypic movement disorder was associated with increased dyskinesia scores and that dyskinesia and stereotypy may be related by common…

Reviews two videotapes on motion: (1) "Demonstrations of Physics, Volume 1, Motion" and (2) "Center of Mass Motion." Describes the content, strengths, and weaknesses of each video. (YP)

Demonstrates what theoretical physicists make a rule using juggling. Provides the thinking process and calculating procedure. (YP)

Describes the mechanism of bicycle computers functioning as speedometers and timers. Discusses why the computers do not display the continuously changing readings and show the correct values at higher speeds. (YP)

Asks the relationship between mass and skidding distance. Provides a problem with illustrations and an answer. (YP)

Presents the LOGO computer language as a source to experience and investigate scientific laws. Discusses aspects and uses of LOGO. Lists two LOGO programs, one to simulate a gravitational field and the other projectile motion. (MVL)

This article addresses issues of orientation and mobility for students with visual impairments, including the perception of motion, visual mechanisms of binocular coordination, perception of impending collision, and body movement to avoid collision. Emphasis is on the role of binocular coordination ability and acuity. These concepts were evaluated…

Compared the spontaneous leg movements of 10 infants with Down Syndrome to those of nondisabled infants matched for chronological age and motor age. Contrary to expectations, no significant difference was found in the frequency of leg movements between the two groups. However, Down Syndrome subjects demonstrated significantly fewer of the most…

Presents three motion experiments that use magnetic switches for marking position and time involving an inclined plane, an air track, and sprinting. (JRH)

Describes a study conducted by the Children's Television Workshop that tested two forms of Sesame Street character movement (i.e., discrete movement versus continuous motion) with three-year-old preschool children using a Nintendo controller. Cognitive factors governing children's game performance and implications for designing interactive…