Little mouse with big relatives. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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A little mouse with a big family. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Using a magnet you can make a funny running mouse. It is better to take a magnet in the form of a horseshoe. You will also need a cardboard cake box. A piece of plywood with a wooden bench nailed on top is inserted into it." This is clearly visible in the figure.

Prepare the parts of the bench: two lumps and a “seat”. Select a nail 1,0-1,5 cm long less than the height of the box. Using another nail, a thicker one, punch a neat hole in the center of the seat. You have to punch it on the board. Using the same thick nail, punch a hole in the small plywood that will be under the bench. Pin the bench to the large plywood, and nail the small one at the bottom, in the middle. It is necessary that a long nail inserted into the hole of the bench should hit the bottom end into the hole of the lower, small plywood, and at the same time stand straight.

Under the magnet you need another thicker piece of plywood. First, hammer a long nail into this plywood so that it goes right up to the head, and then place a magnet on top and tie it with threads or glue it with strips of insulating tape. Insert the nail with the magnet into place and wrap a strong thread on its lower part, under the bench. Pull the end. The nail should rotate, and with it the table with the magnet.

Little mouse with big relatives

The mouse is just a light ball of gray fur with a tail. Attach a steel pen, a paper clip or a piece of tin to it from below. Place the lid on the box. The magnet should rotate under the lid itself, almost touching it. Make a hole in the side of the lid and let the end of the thread through it. Place the mouse on top of the box, just above the magnet poles.

Well, we can start. Pull the thread gently. The table with the magnet will spin and the mouse will run in a circle! It won't be visible from the outside what makes her run. After all, the box is closed. You can glue a house with two doors onto a box - the mouse will enter one door and exit the other.

The mouse is small, but her relatives are very large and respectable. Almost all the electric motors there are in the world! More precisely, the so-called asynchronous AC motors. They were invented by the wonderful Russian electrical engineer Mikhail Osipovich Dolivo-Dobrovolsky.

Little mouse with big relatives

In an asynchronous electric motor, the table with a magnet does not rotate. There's an electromagnet inside. It is motionless, but its windings are made so cleverly that when you turn on the current, you get a magnetic wave. And this wave keeps running, running in a circle, again and again, like the pole of a spinning magnet in our toy. It is she who drags and leads the engine rotor - its rotating part - like a mouse, a small mouse made of gray wool!

Author: Galpershtein L.Ya.

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