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Demonstration of a Variable Tension in a Pendulum’s String

Marina Milner-Bolotin, Department of Physics and Astronomy University of British Columbia, Vancouver

A very effective demonstration of a variable tension in a swinging pendulum can be performed using very simple equipment. Read More...

Induction Puzzle

Leigh Palmer, Simon Fraser University

Here's a demonstration that will make your students think more carefully about the meanings of the terms voltage, electromotive force, and potential difference. A transformer is necessary for the demonstration. Read More...

Sound Tube: A Versatile and Inexpensive Physics Demonstration

Debbie Chaves and Bruno Tomberli, Physics Department, University of Guelph, Guelph, Ontario, N1G 2W1

A versatile and inexpensive demonstration tool for every physics teacher is the “sound tube,” also known as the whirly, Hummer and corrugahorn. Its puzzling properties span many different physics topics. Read More...

The World’s Simplest Motor

John Pitre, University of Toronto

In the December 2004 issue of The Physics Teacher, Christopher Chiaverina described a motor consisting of four components: a battery, a cylindrical rare earth magnet, a small piece of copper wire, and a steel nail. Since I know that many of our members do not have ready access to this journal, I have essentially reproduced his article here. Read More...
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