Motion is the cause of change in all objects, and hardness is no exception. Just a month ago, I watched the video.

It's a popular science, a piece of paper. Vloggers say that pieces of paper can cut objects. You can't imagine how shocked and incomprehensible I was at the time.

Obviously, I bend with my hand, but how can he cut objects? Even tofu and watermelon can't be cut.

With doubts in mind, I continued to read. He said that the pieces of paper were mounted on top of the circular shelves of the cutting machine, and that the speed of the pieces of paper reached 1,200 revolutions per second to cut objects.

From this, I thought that falling objects from a high altitude can hit people. There is a question of why the rain fell from a high altitude, why were people not visibly injured?

When those doctoral students use formulas to calculate, some of them with low academic qualifications say that you have ever been drenched in the rain? Then, it was he who was collectively ignored and despised by them.

Yes, the velocity of a falling object must be great, and the kinetic energy must be great. However, people ignore that water is liquid.

Everyone knows that there is mobility, and the mobility does not disappear when it falls. With mobility, the kinetic energy is dispersed and released by the rainwater.

As for why snowflakes don't hurt people, we'll discuss it next time. To get back to the point, movement increases the hardness of an object.

So, what does this look like? Mizukawa asked, I don't think there is a stiffness in the movement. First of all, we need to understand that this is caused by the transmission of force.

When the piece of paper is not moving, the force is at a point and is extremely easy to disperse.

It is the transmission of force that is disrupted, so that the force cannot enter the object. Pieces of paper moving at a constant speed can compensate for this shortcoming.

At the beginning, when one point of contact force on the piece of paper is about to dissipate, the second point of force comes. As the number of points increases, so does the force experienced by one point of the object.

When this force exceeds the limit it can bear, a relatively flat fracture occurs. The rupture at this point causes the force transmission to be magnified many times over, a bit like a domino effect.

We know that the piece of paper is made into a circle, but it is not a circle in the mathematical sense.

That is, some of the edges are not on the curve fragment as they should be. It is likely that there will be a gap between the two points of the piece of paper, and the force of the previous one will likely dissipate.

Therefore, the transmission of force will not be realized. So, why can a piece of paper cut an object? Actually, it's because the hardness has increased.

So, how much has it increased? Determined by speed. The higher the speed, the more the hardness increases. Dueñas, the back of the knife is harder than the wood, so why can't the back of the knife cut the wood?

You're all only talking half of the story, ignoring the other half. Because the round piece of paper has a small fractal and is in motion.

When the hardness increases, these fractals of the paper make the surface of the object more fractal. These fractals are larger than the original fractals of the object.

When the piece of paper passes a second time, these fractals continue to expand. And the reason for this is the transmission of force.

It's like you can cut a roll of paper by moving the knife back and forth slightly, it requires movement.

The key to this is that the force is not interrupted. Of course, the hardness of motion is only present when an object is in motion.

As soon as the movement stops, the hardness of the movement becomes stationary. Actually, I want to talk about why snowflakes can't hurt people.

However, Mizukawa said next time. Mizukawa rice, remember to say this next time. Margarita, okay.