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Simplified Segner's wheel. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

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The Hungarian physicist J. A. Segner in 1750 demonstrated his device, which, in honor of its creator, was called the "Segner wheel". This device is recognized as a classic, and now it is in every school physics classroom.

We will first make a small simplified model of this device.

Take a table tennis ball. Use small scissors to cut a hole in it the size of a three-penny coin. On the side, make another small hole, such that the rubber band from the pipette fits tightly into it. Insert this rubber band from the inside of the ball into the hole.

The plugged part of the rubber tube should be outside, and press the annular thickening against the inner wall of the ball. On the side of the gum, make a hole with a diameter of 4 millimeters.

Take a match, break off the tip with sulfur from it, tie a thread to the middle and insert it into the large hole of the ball. Now the ball can hang freely on the thread. Here is the device and ready.

Hang the ball from the faucet, put a thin stream of water into its hole. Filled with water, it will rotate on a thread in the direction opposite to the jet flowing from it. Usually they make two symmetrically located exits for the jets, but the ball will spin well from one jet.

Simplified Segner's wheel

If you don't have a table tennis ball handy, you can substitute eggshells for it. At a raw egg, carefully beat the shell near the sharp end and, having made the same hole as a ball, and the edges may be uneven, pour the contents of the egg into a clean bowl. On the side of the shell, very carefully make a hole with a needle. The shell is so fragile that unnecessary cracks can easily appear in it. When the hole is ready, insert an elastic band from a pipette or a rubber tube of a suitable size into it, plugging the outer end with plasticine. Make a small hole on the side. Cover the place where the rubber from the pipette (or tube) is inserted into the shell with plasticine so that water does not seep through.

Author: Rabiza F.V.

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