[Comprehensive Sports] The male god loves science

Masata Asakura has encountered this problem with Ninomiya Kiyoshi many times, and he would explain it seriously before, and found the corresponding case video for him to watch, but there is no way to solve the problem at all, even It will also make Ninomiya bring him together to entangle in the question of "how to hit this kind of ball".

It used to be like this. Asakura Shota remembers that when Ninomiya was in the fifth grade of elementary school, he took Ninomiya to watch the JR. After the competition, he took the player on the field as an example and told Ninomiya that it would take some time to perform this kind of move. How so.After finishing speaking, Ninomiya raised his head and asked him a question that was basically the same as before.

——"Coach, how did you do it?"

At first, Asakura Masata thought that Ninomiya was simply asking how to play the ball and what is the core, and then he replied that it was rotation.

Ninomiya asked, "Well, what then?"

"Then the contact point between the ball and the racket changes according to the rotation of the ball, and you can hit the ball just now. The little student who played the ball has good ball control ability, but he just doesn't have enough strength. Otherwise, the ball can still be played. Even better, it can directly cause the ball to suddenly speed up and turn in front of the opponent." Asakura Masata said clearly, he felt that he had explained the important content to Kiyoshi Ninomiya, and looked down with a little expectation after finishing speaking. Ninomiya, I want to see what I want to see from Ninomiya's face.

But Ninomiya's face was covered with the words "what are you talking about".

Masata Asakura reflected on himself: "Is what I said too profound?"

"That's not true." Kiyoshi Ninomiya, who was in the fifth grade of elementary school, frowned slightly, looking puzzled, "Coach, I can understand what you just said about causing the ball to turn suddenly. According to Bernoulli's principle It can be done theoretically, but I don’t know the necessary conditions for people to use the ball to play such a change. But suddenly accelerating in front of the opponent..."

Masata Asakura: "..."

What is Bernoulli's principle?

He pretended to understand: "What's wrong with the sudden acceleration?"

"This is totally impossible." Kiyoshi Ninomiya said with certainty.

Several question marks popped up in Asakura Masata's head, and he didn't quite understand the thoughts of his own students: "Why can't we do it? Now this kind of ball is very common in international competitions!"

Nigong's expression distorted for a moment, and then returned to the expression that seemed to be about to have an academic discussion with him: "This is very simple, coach, do you know the conservation of energy?"

"Of course I know!" Asakura Masata felt offended, "I also finished college!"

"So according to the conservation of energy - how does the ball accelerate? There is no transfer of energy."

Masata Asakura: "..." That's right, so where does the energy come from?

"Let's not talk about the conservation of energy." Ninomiya Kiyoshi used the "Question of the Soul" skill again, "Assuming that the friction of the ball in the air does not exist at all, and all the energy comes from the player, then according to the conservation of kinetic energy—— Where does the energy come from to make the ball accelerate suddenly in the process?"

Asakura: "...it's spinning!"

Ninomiya Kiyoshi stared at Asakura Shota intently for a few seconds, and a few large characters were written all over his face:

Hopeless.

"So you have to work hard to practice how to hit the ball with spin, topspin and backspin and their degree of change, you can learn a lot." Asakura pretending that no conversation happened just now Shota jumped directly to the end of what he originally wanted to say, but at this time Asakura Shota didn't know that this was just the beginning.

After facing Kiyoshi Ninomiya's question that made him speechless countless times later, he figured it out, he realized it.Why on earth did he want to discuss these things with a primary school student?Anyway, it's all because of the spin ball!

——There is no solution to the moves, all of them are spin balls!

Fortunately, Ninomiya seldom asked these questions since then, unless Asakura made him feel a little helpless, he would grasp one of them and ask him.After asking Asakura like this, he stopped. Anyway, even now, Asakura still doesn’t understand why it is so difficult to explain to other people what they can understand, but it’s so difficult to explain it here in Ninomiya?

Even lead him into a ditch.

Not worth the candle.

There is a lesson learned from the past, so up to now, Asakura Shota is completely incapable of picking up words. Since Ninomiya Kiyoshi said so, it must be that Ninomiya has thought about this before. If he can't do it himself, he won't. Go force it, anyway, Nigong didn't have any tricks to get the main election seat of the Ice Emperor before, so that's enough.

Asakura kept the expression of "what nonsense are you talking about again" and changed the subject, he was worried that if he got entangled with Ninomiya on this issue, he would be so angry that he would feel tight in his chest again: "... put this question aside for now, you Doesn’t it mean that there is still a serve that is not perfect? ​​How far can it be done now?”

"I played against Li Hai in the practice match today," Ninomiya Kiyoshi said and stepped back, and his voice was a little louder when he retreated to the bottom line, "but the burden on the wrist is a bit heavy, I still want to do it again." Try to see if you can reduce this burden a little."

Asakura raised his chin, indicating that Ninomiya could start serving.

Ninomiya's posture is basically the same as in the match with Yagyu Hiroshi this morning, except that he made a small adjustment when he swung his racket and hit the ball.This adjustment is to make a little change in the degree of wrist depression. It is impractical to rely on the wrist to press the ball completely when serving, but the downward pressure of the wrist will impose a certain degree of pressure on the serve. A force in a different direction, in order to change the course of the ball, and the degree of depression depends on the pressure that the wrist can bear.

Now the pressure will be reduced because Ninomiya is not the kind of person who will affect his physical health just to play tennis. Ninomiya has been particularly concerned about this aspect since he first learned tennis.Protecting himself is actually protecting his time to play tennis. He wants to treat tennis as a long-term sport. Not only his family supports him, but even Masata Asakura thinks it is worthy of praise.

The speed of this serve is Kiyoshi Ninomiya's normal level, and he didn't give up the speed of the serve because it is a new move. The serving posture is a little different from his usual serving posture. The position where the racket hits the ball is completely different.When the ball crossed the net, it showed the same change as Ninomiya's irregular return. The speed of the ball has slowed down, and this deceleration is much more obvious than the irregular return.

Asakura didn't move, but stood still and watched the ball hit the ground.The ball landed one to one-and-a-half seconds later than Ninomiya's normal serve, and the ball landed too far to the bottom line, and it would easily go out of bounds if you were not careful.Only this one ball Asakura Shota could see the problem, no wonder Ninomiya would say that this ball is unfinished.

"You want to keep the ball within a fixed range?" Asakura bent down to pick up the ball that rolled down to his feet, and hit it back to a place where Ninomiya could catch it with a raised hand. . "Now it seems that there is not much difference from the return you just made. If it is perfected, it will only be the serving version of the return. It is still easy to crack. Just give up a little energy to catch the ball in advance, and if you When you meet a player who is stronger than you, this kind of serve is only consuming the opponent's physical strength."

Asakura Masata signaled Ninomiya to try sending another one.The ball went out of bounds because it was unstable, and Asakura and Ninomiya didn't think there was anything wrong with it, and they were still trying to practice now anyway.However, because the amount of exercise today was a little bigger than usual, Ninomiya felt a little tired, but he quickly ignored it.

Stretching his arms and swinging his wrists down, Ninomiya Kiyoshi served again, looking completely relieved of fatigue.

Just like what he said just now, Asakura moved to the landing point and swung the racket ahead of time, hitting the ball back. "After the speed crossing the net slows down, the speed of the ball will not be enough, but if you swing the racket in advance, the strength is completely acceptable." This strength even made Asakura's palm a little numb.

He wiped his palms on his pants very casually, wiped off the sweat on his palms and said, "Can't you hit that...zero serve?"

Ninomiya didn't understand how it got involved in the zero-style serve, he uttered a questioning syllable: "Huh?"

"So you should have mastered the skill of playing that kind of ball." Asakura cast a look like looking at a fool, "You can also bring a little change, if this is the case, you can let the opponent take over. Not enough."

Ninomiya stood on the spot and imitated what Asakura said in his mind. He could indeed imagine it, but whether he could do it was still a question mark.

"It doesn't cost money to try it out," Asakura Masata smiled at Ninomiya while leaning on the racket, "Let's start with the variation of the zero serve."

Although Ninomiya was very busy during the two days in Kanagawa, the spirit of the whole person was relaxed, as if he came here for a vacation, and he was happy from the time he arrived home until the time he left.After Kiyoshi Ninomiya returned to his home in Tokyo, he reported to Hana Ninomiya that he was safe and went to clean up the house.

In the evening, besides going to the club to report on time, Kiyoshi Ninomiya did another set of questions and completed some notes for Shinozu.

As soon as the first class ended on Monday morning, Yushi Ninzu came over. When he came, Ninomiya Kiyoshi was sitting on the seat and was a little bored with a pen and writing questions. It was a classmate who knocked on the corner of his desk and called Only then did he realize that Renzu had come over.The notebook in Ninomiya's hand happened to be a science subject, so he reached out and handed it to Shinozu.

"I'm planning to go to the complex building at noon to make a photocopy and give it to you," Kiyoshi Ninomiya took two extra steps outside the door, so as not to block the way for other students to enter and exit the classroom. "It turned out that you came here so quickly."

Ninzuzu casually flipped through it twice, the handwriting inside was very neat, in Ninomiya's usual style, "Anyway, I'm idle, isn't your competition class about to start?"

Ninomiya Kiyoshi has always felt that Shinozu is amazing, every time there is any new news or something related to the tennis club, Shinozu can always hear the wind at the first time. "Yes, the last class started this afternoon, and I spent two consecutive classes in the lecture hall downstairs for competition tutoring."

Kiyoshi Ninomiya didn't have time to tell Atobe about this matter, he also got the news from Chisaki Taketa before the first class in the morning, and he planned to talk about it during the lunch break at noon.

Shinobu poked his head and looked at Atobe Keigo sitting in the classroom from Ninomiya. Atobe was sitting sideways and talking to Sakakibara who was sitting behind him, and then he asked Ninomiya: "What do you say to Atobe?" Yet?"

"Not yet," Ninomiya shook his head, then raised his hand to look at the time, "Wait and tell him that class is about to start, you should go back quickly, you will be fined to stand if you are late." The Chinese teacher in the next class, this teacher is very strict, students who are late will really be fined to stand and have to memorize the text.

Shinobu patted him on the shoulder, and raised his hand to say hello to Keigo Atobe and Tsukasa Sakakihara, who had already seen him in the classroom, and then left at a faster pace.Back in class, Chisaki Taketa, who was sitting in front of Ninomiya, turned to talk to him.

"Shall we go together in the afternoon, Mr. Nigong? I'm worried that I won't be able to find the starting point for some questions. Can I sit with you?"

Kiyoshi Ninomiya bent his lips, and responded politely and gently: "Yes, please advise."

The author has something to say: Coach: This is because of the rotation!

Kiyo: Got it.You can't explain it.

coach:……

kiyo: According to——

Coach: Don't talk about it, go play by yourself, come on!

Everyone =3=