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Foucault pendulum model. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

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The Foucault pendulum is used to demonstrate the rotation of the Earth around its axis. A heavy ball is suspended on a long cable. It swings over a round platform with divisions. And when some time passes, the audience sees that the pendulum is already swinging over other divisions of the circle. It seems that the pendulum has turned and began to swing in a different plane. In fact, this impression is erroneous. The pendulum swings in the same plane, it did not turn anywhere, it strictly maintains the plane of its swing, because no extraneous forces tried to move it aside from its path. Why, after all, did he find himself above the other divisions of the circle? Because the circle itself turned, turned along with the Earth.

Do this experience. Tie a thread with a weight to the pencil - for example, with a nut. Place a ruler on the table and, holding the pencil horizontally, push the pendulum so that it swings along the ruler. Start gradually turning the pencil in a horizontal plane. You will be convinced that the turning of the pencil does not affect the pendulum, it will still swing along the ruler. During this experiment, there should be no wind, draft, which could affect the pendulum.

Foucault pendulum model

Now make a model of the Foucault pendulum. You can turn the stool upside down and fasten at the ends of its two legs, diagonally, some kind of wooden stick or metal tube, and tie a pendulum to the middle of it. Make it swing so that the plane of its swing passes between the legs of the stool. Slowly rotate the stool around its vertical axis and you will notice that the pendulum now swings in the other direction. In fact, it sways the same way, and the change occurred due to the turn of the stool itself, which in this experiment plays the role of our Earth.

Foucault pendulum model

You can also experiment at home not only with a model, but also with a real Foucault pendulum. But where to find a room with a ceiling of at least five meters?

The pendulum is hung on a hook, which can clearly rotate around its vertical axis. The swing plane of the pendulum should run from north to south.

Author: Rabiza F.V.

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Comments on the article:

Gennady
What is the conclusion from the experience? [cry]

a guest
This experience proves that the Earth rotates not only in its orbit, but also along its axis.


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