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around. The student was to hold weights in his hands, and when he was going pretty fast pull his arms in, making himself spin faster. This worked better with smaller volunteers.
Douglas Kilpatrick searched for a replacement for his missing partner to demonstrate the Doppler effect with a foam football with a noisemaker in it. As the football approached, the sound rose in pitch and dropped as the ball went past.
Jennifer Tomedon performed a demonstration of a nuclear chain reaction. A large terrarium held mouse traps and table tennis balls. A ball dropped on a mousetrap set off a chain reaction of bouncing balls.
Mette Eilstrup, Juliana Volkmar and Ane Zorriqueta challenged elementary students to break an egg by throwing it into a sheet outside. The eggs didn’t break because the sheet slowed the force of the impact.
“If you threw it against the wall it would break because the impact would be shorter in time,” they explained. The remnants of eggs on the brick wall testified to the truth of this observation.
Heidi Maeyer, John Mallory and
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