Water pours up. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Water pours up. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Now instead of a bottle, take an empty tin can. It is easy to punch holes in it with a nail. And if you do not have a suitable net, you can punch two holes at the top edge of the jar, pass the ends of the rope through them and tie them with thick knots so that they do not break out. And twirl in the middle of the rope. For verification, you can repeat the previous experience with this jar, pouring it about two-thirds. Water will not spill out during rotation here either.

Well, now punch a small hole in the bottom of the jar. Broke? Pour water and spin. A turn... two... three... A jet of water shoots out of a hole in the bottom. Beats down - this is understandable. It hits sideways ... This is already strange. Beats up! Straight up every time the jar is on top! Why is the water behaving so strangely in this rotating jar? Why does not a drop pour out of the wide open upper part, but a fountain beats out of a small hole in the bottom?

You probably already understand that it's all about rotation. After all, from a fixed jar, water does not shoot upwards either through the upper part or through the hole. And as soon as you start spinning the jar, the water seems to want to run away from the center around which the rotation takes place. It runs from the center ... The force that throws the rotating body away from the center of rotation is called centrifugal. But to call, even the most successful word, is still not enough. The main thing is to understand what's going on.

When the can moves, the water moves with it. Moves by inertia. But you, of course, have already noticed that bodies moving by inertia do not turn to the side by themselves. The goalkeeper, for example, had to work hard to deflect the ball. The rope that holds the jar is pulling your hand in order. It pulls down when the bank is down, this is understandable. But when the bank is at the top - and the thrust is also up!

Water pours up

The bank tends to fly straight, to fly by inertia. And the rope does not let go, wraps in a circle. Bank resists, pulls on the rope. The water in the jar also tends to move by inertia, straight. But the jar (or bottle) does not let it in, it wraps in a circle. Water resists, presses on the bottom. And if there is a hole in the bottom, a fountain beats out of it!

Hence, the centrifugal force also comes from inertia!

Author: Galpershtein L.Ya.

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