Invisible and cunning snake. Fun physical experience at home

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Invisible and cunning snake. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Being invisible - how convenient! You can easily go to the stadium on the day of the most interesting competitions. You can get into the cinema for an evening show, where ordinary, visible guys are not allowed even with tickets. And the invisible man can play pranks as much as he likes: who will punish the invisible naughty?

Of course, you know that it's actually impossible. And yet there are invisible naughty ones. Recently, I was walking down the street, and suddenly someone ripped off my hat from my head. I barely managed to catch it. I looked around - no one was there. Only on the other side of the street is an elderly woman visible. But she is not up to me; she clutched with both hands an open umbrella, which someone invisible was pulling, shaking it from side to side. And suddenly - bang! ding! Splinters rained down at my feet. It was someone's invisible hand that slammed the window shut, so hard that the glass flew out.

Who is outrageous on the street? Who is this invisible bastard? You, of course, have already guessed. It is the wind, the movement of air. Air fills all the space around us. Without it, we would not be able to breathe, hear, or smell. Air is transparent, malleable, light, so we often forget about it. But he lives his complex life and is constantly moving. Even on the quietest, windless days, you can notice the slight movement of leaves on the trees, small ripples, sometimes running across the surface of the water.

Air moves in the room. It is worth leaving a window or door open, even loosely covering the window, a draft begins to walk in the house. Many are afraid of him. Having smeared the windows, closing the doors and vents, lighting the stove, they sit and rejoice: at last the invisible rogue has been pacified!

But there is a cunning snake in the world. She feels the movement of air better than people. Now we will do it and check whether the air in a closed room is really so still.

A snake can be made from an old postcard, a sheet torn from a drawing notebook is also suitable. Draw a snake pattern from our picture and carefully cut it out with scissors. On the tail of the snake, in the very middle, squeeze out a small indentation with the tip of a pencil.

Invisible and cunning snake

Let's check now if our snake is working. Put it with a recess on the tip of a sharply sharpened pencil and lift it up. Throwing your head back, lightly blow on the snake from below. Spinning!

So, the cunning snake really notices what people do not see. She feels when the air rises. Let's try to use this property of the snake and look for a place in the room where the air itself rises. Bring a pencil with a snake to a heating stove or to a central heating battery. Move it very close, so that only the snake can spin freely.

The cunning snake will turn! It will spin faster, the hotter the stove. This is because the stove heats the air and the warm air rises. He spins the cunning snake.

Author: Galpershtein L.Ya.

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As part of the festival dedicated to the 60th anniversary of the Eindhoven University of Technology (Netherlands), the world's first cafe was opened where customers are served by flying drones. The project, which involved 20 university students, took 9 months. According to project leader Tessie Hartjes, he and his colleagues tried to create not just a robot waiter, but a tool that everyone can program for their own tasks - something similar in importance to a mobile phone.

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