Inertia Demonstration
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“On the top of a short pillar is placed a card, and on the card a brass ball. Beside the pillar is fixed a steel spring, with an apparatus for drawing it back. If the spring is drawn back and the suddenly released, it will drive the card from the top of the pillar, while the ball in consequence of its inertia will retain its place.” —Quackenbos 1859
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General PhysicsSource
G. P. Quackenbos A.M. A Natural Philosophy: Embracing the Most Recent Discoveries in the Various Branches of Physics, and Exhibiting the Application of Scientific Principles in Every-day Life (New York: D. Appleton and Company, 1859) 15
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