Ling started with wood carving, and after teaching Fei the basics of carving, she let her practice on her own. Half an hour later, when she looked at Fei's first work, Ling moved her eyes away without leaving any trace. What is needed for beginners

It’s an encouragement rather than a discouragement. At least you can see the nose, eyes and mouth on the head of the figure. It’s a good job for a first work, right?

Twenty o'clock in the evening was originally Ling's time to practice swordsmanship every day. But now she plans to allocate part of this time to teach her disciples. She will explain the theory to Fei and demonstrate by herself, using the so-called teaching by words and deeds.

teach.

"It's finally time to start formal practice." Fei's face showed a rare expression of excitement.

"Then let's start with the most direct and crucial truth. All the training I do as a teacher is to pursue the improvement of destructive power. And according to my practice, power is pressure! Strong pressure means great power!"

Fei looked confused after hearing this: "What is pressure?"

Ling Zuo continued to ask, "Don't you know?"

Fei answered of course: "I never went to school."

Ling: "Light intensity?" Fei: "I don't know." Ling: "Power?" Fei: "I don't know." Ling: "Field strength?" Fei: "I don't know." Ling: "Impulse?" Fei: "

I don’t know.” Ling: “Kinetic energy?” Fei: “I don’t know.” Ling: “Volume?” Fei: “I know that.”

Finally hearing a word she knew, Fei breathed a sigh of relief, while Ling sighed.

…………

Ling asked patiently and found that Fei seemed to only know the most basic content related to length and weight. She didn't even understand what gravity was. When Ling put a gravity bracelet on her before, Fei simply felt uncomfortable and didn't feel anything.

Realize what's happening to you.

Although I don’t know what style masters teach disciples in dojos of other schools, but here, Ling just takes Fei to study. Although she doesn’t understand anything, Fei’s learning attitude is pretty good and her memory is not bad.

, if you don’t understand, just ask, don’t pretend to understand if you don’t understand.

Ling had no intention of spending all her time tutoring Fei. Apart from giving her some after-school homework for her to study on her own, during her training time, she only explained to Fei the necessary knowledge that she thought was needed to learn martial arts.

"The so-called physics is actually the study of the principles of things. Although Fei does not need to be a scholar, there are still some basic concepts that you need to know. Let's start with the basic units of length, weight and time. Fei's height is 1.48

Submoment (m), weight is 35 krim (kg), and there are 60 seconds (s) in a minute. I think you should be able to understand these concepts."

"Yeah." Even if Xiao Fei is uneducated, she still knows these basic concepts in physics. These are considered common sense.

"The first concept is speed. How much distance can be moved per second. For convenience, the unit of speed is submoment/second."

Ling casually assigned three word problems to Fei that could be solved by lower grade students in Sunday schools: find the distance when the speed is known, find the time when the speed is known, and find the speed when the distance is known.

"I understand this. This knowledge is needed every day in the regiment."

Next is the slightly more abstract concept of acceleration.

"... Just like when running, you can't reach your fastest speed at the beginning. How does it feel to continue to exert force to reach the highest speed?" It is not difficult for Fei to understand this. She is known for her speed.

This is deeply felt.

"It can be understood that way. In fact, we humans are subject to an acceleration exerted on us by the earth under our feet every moment. In physics, this is called the acceleration of gravity. Because of this, we can stand firmly on the ground.

rather than floating in the air. As for the basic principles involved...the contents of the "Law of Universal Gravitation" and "Special Theory of Relativity" that describe inertial systems are not at the level that Fei's current breadth of knowledge can touch. For you,

It’s too far away, so you don’t need to force yourself to learn it for the time being. Fei just needs to know the basic concept of acceleration.”

"Well, the earth has an attraction for objects. Why do things thrown into the sky fall? I probably understand this. As for the things that are difficult to understand at first glance... I have never heard of them. What are they?

Ghost." Ling said that she would not teach Fei these things for the time being, but Fei's subconscious instinct seemed not to want to learn at all...

"Ahem, don't worry about that Fei for now. Let's get back to the topic, so strictly speaking, we call weight mass. Mass refers to how much material an object contains, so the quality remains unchanged no matter what the environment. In daily life

Medium mass and weight have the same meaning. Weight also refers to mass, and mass does not change with the state, position, or other factors of the object. The equipment I gave you changes the acceleration exerted by the earth on ordinary objects. The acceleration due to gravity is about 10

Moment/second to the square. And now the acceleration your body is experiencing is 18 sub-moment/second to the square. So you will feel that your body will become very heavy."

Fei nodded, then squeezed her fists. Then she tried jumping off the ground a few times. It was indeed much more difficult than before. Because of Ling's instructions, she had not taken off her gravity bracelet since the afternoon.

Although I have gradually adapted to the uncomfortable feeling, I can still feel that no matter what action I make, it takes more effort.

"Then let's talk about force in the physical definition. Just like there is a conceptual difference between weight and mass, physical force is not the same thing as the force we talk about in daily life. Force is the effect of an object on an object.

The unit of force is n, and 1n is equal to 1[(kgm)/s]. The force of 1 krem ​​that we call in our daily life is actually the force required to lift the material of 1 krem, that is,

The mass of 1 Krim multiplied by the force required for a standard gravitational acceleration, which means 10n."

"It's a bit complicated, let me think about it..." The abstract concept was a little difficult for Fei, and she tried to understand this expression in her own way. "My weight... ah, no, I should say, my mass is 35

Krim. So I usually only need to use 350n of force on my feet to take off and get my feet off the ground. But now because the gravity has changed, I have to spend 630n to jump up. So no matter what I do now, I feel better than before.

The feeling of force, although Ling just said that 'force' is not 'strength', it feels quite similar to me, right?"

"Well, I realized it very quickly. The reason why I say it is different is because the meaning of power in daily life is broader, and not all 'power' can be simply measured. The power of the soul, the power of the spirit,

The power of magic, the power of ancient relics, the power of treasures, the power of spiritual veins... There are all kinds of power in this world. The power in physics is just the most basic, simplest kind that can be measured and calculated.

.”

"So, the power of bullets and bombs can also be calculated?"

One of the reasons why Fei can serve as the squadron leader in the West Wind Brigade is that she is proficient in the use of bombs. Although her frontal combat ability is slightly inferior to other squadron leaders, the destructive power she can cause on the battlefield is not inferior to them, and even

He is superior to them. Fei's fighting methods can be said to have been inherited from the trap master Jeno.

"Of course. But that has to be discussed in terms of energy. I won't teach you that today."

"Hey? I really want to learn." Fei obviously showed a higher interest in useful things.

But Ling was unmoved and decided to leave this part until tomorrow and the day after tomorrow.

"Let's go back to our original question. Let's talk about the concept of pressure. The ratio of the pressure on an object to the force-bearing area is called pressure. Pressure is used to describe the effect of pressure."

After finishing speaking, Ling took out the cardboard and iron plate and placed them in front of Fei.

"Human fingers can easily pierce paper, but it is difficult for human strength to pierce steel. This is due to the difference in materials of the objects."

Ling began to demonstrate, stretched out her right hand, and poked a hole in the cardboard with her slender jade fingers. Then her index finger was wrapped with air current that was so light that it was almost invisible, and she also poked a hole in the iron plate.

Philippines:……………………

"Ahem, cough, cough, the demonstration for the teacher is not very good... Why don't you try it yourself, Fei?"

Fei doubtfully poked a hole in the cardboard, but no matter how hard she tried, there was no trace left on the iron plate next to her.

"How is this going?"

"This is the true meaning of martial arts that my teacher said at the beginning. As long as the pressure is enough, there is no difference between an iron plate and paper. Power means pressure! Strong pressure means strong power!"

It sounds very simple and easy to understand, at least in Ling's own opinion, it should be so.

"So how do we increase the pressure?"

"Let's start from the beginning. In order to facilitate calculation in physics, we set the unit of pressure to 1n. A force exerted on an area of ​​1 square sub-moment is called 1pa."

"The force is too small... maybe just a light tap on the table?"

"Just for the convenience of understanding. We rarely encounter such a small pressure. 1pa is equal to 1 [kg/(ms)]. In fact, when we stand on the ground, the pressure on the ground is about

Thousands of pa, and when running, the moment you hit the ground can even reach hundreds of thousands of pa."

Ling came to this conclusion based on her own data. She wears 32 West size (20 mile) Mary Jane children's shoes. When standing normally, the total contact area of ​​the soles of both feet adds up to approximately

250 square miles moment, which is 0.025 square sub-moment. Therefore, the pressure on the ground is 15200pa. Because the footwork she practiced strictly uses the forefoot to land on the ground (the position of the metatarsal head), so when she actually lands, only the

The sole of a shoe corresponds to a small piece of the forefoot, and its area is about 10 square miles, or 0.001 square sub-moments. This means that when she lands, the pressure on the ground is 380,000pa (0.38mpa).

And if she starts running with her fighting spirit at full strength, which is now over 200 Torim, the pressure on the ground will be 2000 MPa. Not to mention the soft soil, even the metal ground made of steel cannot withstand it.

Withstand this terrible stampede. Before "one step at a time", the shoes on your feet will definitely be scrapped. So if Ling is moving at full speed, she will definitely use her fighting spirit and footwork to reduce the impact on the ground, shoes, and other objects.

Have the burden caused by your own feet to avoid "leaving traces in transit".

"Hmm...it's tens of thousands of pa just standing, and even hundreds of thousands of pa when running? I've just memorized the data. But what does this have to do with the iron plate just now?"

Fei asked, pointing to the iron plate that was pierced by Ling's finger.

"All materials in the world have the concept of strength. Taking the most common metal steel as an example, the No. 1 Manufacturing Plant of the Lineforte Group where I worked in the past conducted tests on the strength of various steel materials. The yield strength was obtained

and tensile strength. Steel will deform when the pressure it withstands exceeds a certain level, and will break after it exceeds a certain level. Tensile strength is the ability to resist maximum deformation, and yield strength is the ability to resist initial deformation.

This steel plate is rf235 steel with the largest output and the best cost performance of Linefort. It means the yield strength is 235MPa. The guide trains produced by Linefort Group’s third production plant and the rails laid are all made of this material.”

"In other words, as long as the pressure exceeds 235 MPa, can we reach the so-called breaking of steel state in the legend?"

"Well, it can be understood that way, but if it is the 'broken steel' in ancient heroic legends, the requirements may be higher. The steel used to make weapons by the second production plant of the Lineforte Group is rf460, with a yield strength of 460mpa. That should be

It has the highest strength among mass-produced steels, has the best comprehensive mechanical performance indicators, and is of course the most expensive. As for alloys with a yield strength exceeding 1000 MPa, I have also seen it in the laboratory of Luray University of Technology, even exceeding 2000 MPa.

The materials are all there, but they are laboratory products and we haven’t found a manufacturing method for mass production yet. By the way, the S weapon in your hand is made of a special alloy named after the god of forging, Coruda Steel.

It's above 3000mpa. Even now, I can't use combat skills to destroy that thing." The Sword of Mind is not included, as it is not a conventional combat skill. In normal combat skills, Ling can only wait for the Bliss Sword to sever the iron strike.

It can probably break S-weapons made of Koldarai steel.

"Hey, Ling, how do you know about the S weapon? Not everyone in the group knows about it."

"Because your weapon was designed and manufactured by me! Last year, the 'Mr. Lian' placed an order for me, and the delivery target was the West Wind Brigade. And that special style of double gun blades is actually only

Are you using it?"

Ling did not hesitate to tell Fei about her connection with the black workshop, but she did not intend to tell her that she was "Mr. Lian". "Mr. Lian" was "dead", so there was no need for that kind of black history.
To be continued...