Bach! And plywood in half. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Bach! And plywood in half. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Take a strip of plywood 2-3 cm wide and 50-60 cm long or an old, unusable ruler. Balance it on the edge of the table so that with the slightest pressure on the free end, the plywood falls. And now spread a newspaper on the table over the plywood. Gently spread, smooth with your hands, straighten all the wrinkles.

Previously, plywood could be knocked over with a finger. Now a newspaper has been added, but how much does it weigh? Come on, bolder: hit the end of the plywood with your fist. Fuck! Oh what is it? Even the fist hurt, and the plywood lies, as if it were nailed with nails! Well, now we'll show her how to resist! Take a stick and hit with all your might. Bach! Plywood cut in half, and the newspaper lies to itself as if nothing had happened.

Bach! And plywood in half

Why is the paper so heavy? Yes, because air is pressing on it from above. 1 kg per square centimeter. And the newspaper has a lot of square centimeters! An unfolded sheet of regular newspaper is 60 cm long and 42 cm wide. Well, guess what area it is? 60x42 = 2520 sq. cm. So, the air presses on it with a force of two and a half thousand kilograms, two and a half tons!

Raise the newspaper slowly: the air will also penetrate under it, and press down from below with exactly the same force. But try to tear it off the table at once, and you have already seen what happens. The air does not have time to get under the newspaper, a void forms there, and the plywood breaks in half!

Author: Galpershtein L.Ya.

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