Didn't we talk about putting the balloon in an iron plate, holding the plate and holding the balloon. Then, let go.

The result was that the balloon was bounced up. In this way, the deformation part of the balloon only takes away a small amount of elastic potential energy.

When I checked the encyclopedia just now, I found that eddy currents are actually a phenomenon of electromagnetism. Of course, there are also vortex currents in internal combustion engines.

That's how I understand it. When the plate falls, the airflow is originally upward. However, due to the movement of the plates, the airflow underneath the plates had to be detoured.

As a result, the air pressure under the plate is smaller. Originally, the mass of the plate was large, and it should have fallen faster.

However, due to the low pressure below, the pressure above is strong. At this point, the atmospheric pressure forces the plate to run towards a place where the atmospheric pressure is strong.

Due to the strong pressure from above, the plate will rise. If there are no balloons, then the plate can be seen to rise in a shadowy way.

But why not? That's because the balloon is met when the plate is moving upwards, and the balloon touches the plate.

If the plate rises upwards, it will cause less pressure above the balloon. At this point, the balloon will descend along with the plate.

So, in the end, the result is that the plate and the balloon hit the ground at the same time. In the second experiment, the experimenter punched holes in the plates.

Since the airflow under the plate was blocked before, now there is a hole. Then, the airflow can smoothly reach the top of the plate from the hole.

However, the results of the experiment were still implemented at the same time. What does this mean? We have to ask the question, if there is no resistance, should the air flow move in a straight line or in a curve?

Between our two points, the line segment is the shortest. According to the principle of lowest energy, the air flow should move in a straight line.

If the air flow moves upwards, then it must be vertically upward. We know that it is a cone-like shape.

When the balloon is placed on a plate, it is forced to take a detour when the airflow reaches the bottom of the balloon. You might think that the balloon is light, so you can go straight to it.

However, balloons do not tell that balloons are light. Once, when it encounters an obstacle, the first thing is to get around it.

Then, move in a straight line again. In the course of this curvilinear movement, a vacuum area of air flow is formed.

Because of this area, the balloon will go upwards. However, the bottom of the plate is also under low pressure. Since the pressure in both places is small, the atmospheric pressure reaches equilibrium.

Therefore, the plate did not go down and the balloon did not rise. The third experiment was to hold the balloons on a porcelain plate, but they did not hit the ground at the same time.

It is true that the pressure can make the bottom plate rise, but this is related to the bottom area of the plate. If the base area exceeds the limit, then it will fall to the ground at the same time.

Otherwise, it can't. Science comes from life, but it doesn't stop there. The air currents are invisible, but they are real.

Such experiments make us know more clearly that the invisible does not mean that it does not exist, and that there are no small things in life.

I remember someone saying that in order to explain a phenomenon, you need a theory. In a very ordinary experiment, we look at the world with our eyes together.

Physics doesn't seem to do anything for me, it doesn't seem to be of use to me. However, there is really not so much to distinguish between what is and what is not.

For example, some painters can make a living by painting and can even sell for sky-high prices. Although you and I can't do it, haven't we also given us inspiration?

Only when you are deeply involved in a certain field can you make achievements. With the results, is it obvious whether it is useful or not?