Provides an answer to the question of why it is easy to miss when shooting uphill or downhill. Experimental results indicate that when shooting uphill or downhill, sight should not be adjusted to actual distance but to distance multiplied by the cosine of the inclination angle. (JN)

"Planetary Motion Simulations" is a system of programs designed for students to observe motions of a superior planet (one whose orbit lies outside the orbit of the earth). Programs run on the Apple II microcomputer and employ high-resolution graphics to present the motions of Saturn. (Author/JN)

Describes an exercise, suitable for use on programmable calculators or microcomputers, to calculate some of the rapidly processing orbits of a mass M near a static black hole star of mass M. (SK)

Discusses several ways in which movement can contribute to an understanding of music. Describes several activities to try with students. (MA)

Describes an advanced high school physics experiment demonstrating rotational kinematics and dynamics, using simple equipment such as empty coffee cans, inclined planes, meter sticks, and a large 10-second demonstration timer. (CS)

Since junior high students frequently claim that they can't draw, the author suggests initiating visual expression activities through a skill they do have confidence in--their handwriting. She outlines several drawing exercises in which letters are used to express movement. (SJL)

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)