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Falling Faster Than ‘g’

T. Dean Gaily, University of Western Ontario

A simple lecture demonstration to illustrate that some objects do ‘fall’ with an acceleration greater than 9.8 m/s2 is constructed from two pieces of 2.5 cm × 15 cm lumber approximately 1 m in length (1” × 6” × 39”), hinged together at one end. A small marble placed in a notch at or near the end of the “falling” board can be made to fall slower than the board and land in the cup strategically placed on the falling board. Read More...

The Electrostatic Precipitator

Roland Meisel, Ridgeway-Crystal Beach High School

An electrostatic precipitator can be assembled in less than half an hour using parts commonly found around the science department in a high school. I have used it as a demonstration in classes ranging from grade 10 general science to grade 13 physics. In addition, it has spawned several senior science projects using it as an investigative tool. Read More...

Real Image Demonstration

Don Murphy, Sydenham High School

Many demonstrations can be made not just interesting but truly memorable by “setting up” the students a bit beforehand. A rather well-known demonstration involves a real flowerpot and a flower suspended upside down inside a box placed 2 focal lengths in front of a large concave mirror. The viewer sees an illusion of the flower being on top of the box but the image disappears when the viewer approaches too close. The apparatus on hand at our school for a similar demo is illustrated below, but in this case a real image of a light bulb is formed. Read More...

The Thermobile and Icemobile

Peter Levan, Lockerby Composite School, Sudbury

At last year’s conference in Sudbury, Al Hirsch demonstrated his icemobile1 and I mentioned the action of a thermobile1. Some people were interested in more explanation and information on these little toys and the physics behind them. Read More...
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