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The D.C. Motor

Peter Scovil, Waterford District High School

Have you had difficulties explaining to students the complexities of the D.C. motor? Read More...

Bloody Ballistics

George Vanderkuur, Ontario Science Centre

The heart is a mechanical pump that is used to move an incompressible fluid (i.e., blood) through a very elastic closed network of tubes. With each cycle of the “pump,” the whole system expands and contracts. Read More...

Electrostatics with Ping Pong Balls

Gyula Lorincz, University of Toronto

Many of our old favourite electrostatics demonstrations can be improved using ping pong balls painted with graphite to replace pith balls. In particular, a simple but very sensitive electrostatic torsion balance can be used to demonstrate both the attraction of opposite charges and the repulsion of like charges. Read More...

Overhead Projector Wave Simulator

Bill Konrad, Kent County Board of Education

The demonstration described in this column is one I learned as a teacher in summer school at the beginning of my teaching career. It is one that I have found to be very useful in teaching a number of concepts related to waves. Read More...
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