FASCINATING SCIENCE TRICK

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STRONG PAPER PILLAR

You know that a sheet of paper is quite fragile. To prove it, it is curved slightly, set on edge, and then crumpled with a lazy down stroke of the hand. But you can still set such pieces of paper edgewise and have them support a weight of several kilos.

YOU WILL NEED:
Four sheets of fairly small paper, some mending tape or rubber bands, and several good-sized books.

INSTRUCTIONS:
Roll each sheet of paper in to a tube one inch or more in diameter and either tape it together or gird it with a rubber band. Set these tubes upright as the corners of an imaginary rectangle. Rest a
book flat on these "Pillars of PAPER", and when it is set in
place, add another book on top, then another and perhaps still more. The paper pillars will support them all!



SCIENCE BEHIND:
This is a scientific test of simple longitudinal stress, where a short pillar is compressed by opposite forces applied at its ends. The paper pillars serve like hollow metal posts as long as the pressure is straight downward; in fact, the books might as well be resting on a stack of paper sheets. But any strain from another angle will result in compound stress, causing a pillar to collapse.

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