In the era of peace, if Lu An was asked to choose a place to live, Lu An would definitely go to Jiangdong. It's a land of abundance. The dishes are all sweet. How many humanities and ink writers have left good poems in Jiangnan. As for Shuntianfu and Xi'an, the wind there can be described as Shuofeng. In modern and easy-to-understand terms, the wind there carries sand. That's why Luan chose to go to the southeast.

Taking a ferry from Gyeongseong, I quickly arrived at the largest city in Southeast Asia, where Lu An finally left the world. When Luan sees the city's bustling neon lights, towering metal-glass mansions. An illusion was created, the illusion of going back in time. In the previous life was prosperous turned into ruins. And now the prosperity is in front of my eyes.

Looking at the busy streets, Lu An raised his hand and tried to touch the air, and then Lu An sighed faintly: "Peace is so good. ”

Forty minutes later, Luan took the subway to his destination. After entering this building, the people inside learned their intentions. Immediately registered the data with Lu Ann on the computer. Then after receiving a deposit of 3,000 yuan from Lu An, he asked Lu An to participate in the test. This is a superpower testing center, and relevant medical examinations are to be done.

After a series of blood draws and X-ray projection examinations, Lu An sat on a bench and waited, and after a while, he said on the electronic screen, "Please arrive at the third test hall in ten minutes on the twenty-fifth."

Lu An stood up and complained, "It's really the same as the ward." ”

Walking into the hall, Luan saw three people wearing blue electric armor suits, and the blue armor suits had a tiger's head printed on them.

The first one said to Luan, "Start testing your abilities." Lu An said, "Here? Is it for me to slide? With that, Lu Ann skated on the ground like an ice skate.

The leader smiled, pointed to the machine next to him, and said, "Unleash your abilities on that contact surface." Then you're ready to complete the test. ”

Lu An nodded, the test machine was two blocks, and Lu An released his ability at the block on the contact surface. With a bang, two blocks slid away.

The researcher on the side said, "Well, yes, the drag coefficient has been reduced. Please continue with the next test so that we can give you an easy rating. ”

Dozens of minutes later, after repeated measurements, the subject wrote a second grade on the list given to Luan. Then he smiled and said to Lu An: "Very good, if you can develop it reasonably, your ability is very practical." Prepare, and in a week, take the cultural class exam. ”

Lu An asked, "Exams?" What to review? I probably know very little about superpowers. The tester said, "You are still a student, and it is your natural obligation to receive knowledge education at your age." Your grades determine which school you can go to. I don't know how to test superpowers, that is, Chinese, mathematics, physics, and chemistry courses. After arriving in Chongming City, in addition to the development of superpowers, you still have these courses. Just because a child has superpowers doesn't mean he can skip class. ”

Lu An nodded and said, "I understand, my transfer procedures." ”

The tester said, "In accordance with national law, we can give you priority. Well, you're still an orphan. Don't worry, the state's orphan grant, we will help you apply"

Note, these individuals do not administer orphan benefits though. Ordinary people may get bureaucratic delays, but it is absolutely very easy for these people with high authority to handle what this legal provision should be. The bureaucracy did not dare to delay these people. In other words, Lu Ann was finally able to get out of the orphanage.

Eventually, the subject said to Luan, "If you don't have a place to stay for the next few days, we'll arrange it for you." ”

Lu An shook his head and said, "I've already booked a hotel, thank you." ”

After walking out of the superpower test building and retrieving the deposit, Lu An picked a leaf, and suddenly let go and put it down, the leaf fell to the ground like a stone, and after touching the tile floor, it bounced up like a ping pong ball, and the leaf that bounced up with Lu An's contact ability fluttered down. As soon as it came into contact with the ground, a white mark the size of an ant's leg appeared on the tile.

Lu An smiled faintly and said, "This is my super power." Luan shook his head.

In the ability test just now, Lu An tested some values, but kept some, and all the tests were to test the drag coefficient that Lu An could reduce on the contact surface of one meter or two meters. Luan can indeed reduce the drag coefficient, but how low can he reduce the small targets that can be completely controlled, such as a leaf or a marble. In the test just now, Luan didn't show it.

It is terrible to reach the theoretical perfection of any physical quantity, but Lu An can achieve this approximate theoretical value. Luan's ability is not to lower the resistance, but - to approximate zero resistance. This anomalous ability that Lu An awakens seems to be a mockery of Lu An's character.

Luan walked to the hotel and turned on the TV. Opened the book and began to prepare for review, Lu An couldn't help but open the physics book, and said silently: "Any physical quantity that is missing somewhere causes the phenomenon is the current superpower. ”

A brief introduction to what this ability is.

Lu Ann had tested this ability before he arrived. This is an area, and the area that Luan is now capable of forming is a cube 1.3 centimeters long. Of course, Luan can turn this area into a thin membrane. Wrap yourself around the object you want. The minimum thickness of this film is about 0.3 millimeters. The coefficient of friction of the surface of the encased object in contact with the surface of another object is zero,

In the public test of entering the test center, Lu An turned the membrane into a grid and distributed it on the surface, and the result was that the resistance was reduced. In Luan's own tests, the object was perfectly encased.

One of the tests is the impact, first of all, there is no perfection in this world. There will be no perfect plane, even a flat plane will have bumps, if a K-shaped surface and an arc-shaped face come into contact, the center of K will be in contact because of the force thrust on the two contact points, causing a tear crack to appear in the middle.

Luan landed on his own skin with a marble at a height of half a meter. This marble made Lu An's arm hurt, it was a little pain, and the skin around this point seemed to be forcibly pulled apart and torn by the impact.

When your skin comes into contact with the marble, the contact surface slides around because there is no resistance to the contact surface under the squeeze of the impact. Lu An took the marble, and a red mark appeared on his skin, and the blood line cracks on the skin surrounded the contact point between the marble and the skin, and the point where the marble collided was secreted with blood beads.

Normally, if a stick comes into contact with the skin, then there must be a thread on the skin as the central axis, which begins to molt outward. The same goes for the whip draw. There is a red mark in the middle of the whip mark, and the skin on both sides is turned outward. It is said that a whip that is stained with water hurts more when it whips a person, and this is the truth.

Half a meter is only half a meter high, and the mass is only one glass marble, which is like this when smashed into one's own skin without resistance. If it is normal, it should be that when your skin is sunken, a surface that fits closely with the marbles is formed, and the friction of this fitting surface completes the cushioning of the impact force. And now this sunken surface and the surface of the marbles are absolutely smooth. When it slides outward under the force of impact, the phenomenon of molting occurs.

Of course, the energy is still conserved, and one's skin is elastic, and the impulse of the marbles falling becomes the elastic potential energy of the sunken down on the skin. There was no unhindered penetration of marbles through one's body. Because the marbles don't have enough energy in an instant. Tearing the skin.

And when it falls on a rigid object, it's not so good, smashing on the glass, not to mention smashing on the glass, it is this glass marble that is naturally placed on the glass ashtray, under the weight of natural gravity, after dozens of minutes, the contact point between the marbles and the ashtray will continue to breed on the white plush cracks of the glass cylinder. If you don't take it off, it will be stretched out, and finally it will directly shatter a real ashtray, like a glass block broken by a small pebble.

Theoretically, as long as the time is long enough, no matter how small the mass of the object is, as long as it has contact force with the glass, it can finally break the glass with one click and one side. It's the same when it falls on Luan's skin, although the instantaneous impulse can't penetrate the skin, but over time, under the action of gravity, it will eventually slide into Luan's skin. That's unobstructed.

Collisions with rigid materials are a bit more complicated. But the destructive power is the same. Even if a leaf is smashed on the ground, the impulse can cause damage, although it is only a white mark the size of an ant's leg, such a tiny white mark, people can't detect it at all, but the crushing effect caused by this collision is undeniable. What if it were a slingshot?

Luan tried hitting a concrete wall with a steel ball. If a non-impeded film is encased in a 0.5 mm thick film, the marbles collide with the wall and sputter white powder. The wall is not deep. If it is a two-millimeter-thick non-obstructive film, then the sputtering is the size of sand, which is greatly improved into the wall, and it is obviously easier to crush the rigid material of the wall into large particles when the beams are sufficient, than to crush it into small particles and squeeze it out.

A 0.5 mm film layer allows only powder-sized particles to splash out on impact, while a 2 mm thick film allows grit to slide out from both sides of the ball. If the energy is insufficient, it will start at the point of contact and create a crack inside the material.

All in all, it is not just a matter of sliding drag reduction, but also a question of the ability of the object to break down the obstruction when it collides head-on. The penetrated object can only use up the kinetic energy of the zero-resistance object at the cost of self-crushing or self-transformation.

However, if you travel through the fluid, there is no resistance, and the air that is squeezed in the front will flow down the membrane to the back. The pressure at the front and the pressure at the back are balanced.

And how does an object protected by this membrane feel after being impacted? It is borne by the whole face, and the whole and the front side perpendicular to the direction of the impact force. If this membrane wraps a person in front of him, then a bullet will hit head-on, the bullet will be shattered into a large number of particles, from both sides of the face, and the person in the face protection will be under the thrust of the whole face, because the whole face is under pressure, the bullet can not be lethal to the person, in other words, the recoil force of the bullet is still transmitted to the shooter through the butt, the small area of the butt is fine, and the surface that is impulsed by the bullet is greater than the butt.

That is, this can be either a spear or an armor.

Sitting in the hotel, Lu An self-assessed that "at the moment, we can only achieve coverage at the square decimeter level. If you can achieve a coverage of two square meters. I should be the great power of this world (level 4)"