On guard of peace. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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On guard of peace. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

In addition to the inertia of motion, there is also the inertia of rest. Such inertia has, for example, a cabinet standing on the floor. Try to push it - it won't move! Do you think it's all about inertia?

Cut four slices of raw potatoes. Arm yourself with a lever and, alternately lifting the corners of the cabinet, put a slice under each leg. Ready? Now click on the cabinet again. Look, let's go! You didn't push any harder than the first time. So, it's not just inertia. In order to overcome inertia, you would have enough strength. But you did not master the friction. And only raw potatoes helped.

By the way, remember this technique. It will help you move the heaviest furniture. Just don't use it on a polished hardwood floor. Potatoes leave wet marks, then you have to rub the floor again!

It turns out that friction is not only the enemy of motion. Friction is the guardian of peace. If there were no friction of rest, amazing things would happen in the world. Furniture would walk around the rooms from a slight draft. From all the mountains in the world, all the glaciers, and all the stones, and even all the land lying on the slopes, would slide down. The calmest schoolchildren would not be able to sit on their desks: at the slightest movement, they would slide to the floor. And you never know what other troubles would have happened!

It is good that static friction exists. To see this once again, do a fun experiment.

Place the match on the table so that the head protrudes from the edge. On this match, put another 14 matches across, alternately with heads in different directions. The figure below clearly shows how to do this.

On guard of peace

Is it possible to lift the first match by holding it by the head, and with it all the other matches? It turns out you can. To do this, you only need to put one more match on top of all the others in the hollow.

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

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