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Investigates the principle of scientist Galileo Galilei on the principles of isonchronism. Ideas on the natural frequencies of physical systems; Analysis on the experimental observations of the pendulum; Illustration of the isochronism principle.

Examines the prescriptive power of instantaneous impulse construction. Prescription for the determination of a central force motion for a body moving on an arbitrary curve; Application of a centripetal force formula to a variety of curves; Characterization of orbits of an inverse square force.

Examines the source of the Maxwell equation labeled as `Ampere's Circuital Law.' Literature supporting the notion that the law was not named after Andre-Marie Ampere; Magnetic field vector in Ampere's Circuital Law.

Presents letters to the editor referencing articles and topics discussed in previous issues of "The Physics Teacher." Reaction on the guest editorial by Leon Lederman about requiring physics in high school education; "Prescribing Eyeglasses for Myopia and Hyperopia," which discussed myopia and hyperopia; Response by Michael J. Ruiz to a letter to the editor about his article "Prescribing Eyeglasses for Myopia and Hyperopia."

Several letters to the editor are presented in response to the articles in previous issues including "The Blowgun Demonstration Experiment," by Koji Tsukamoto and Masanori Uchino in the September 2008 issue, and the article about the Liberal arts physics.