"I see!"

"The same thing falling from a high altitude, no matter how big or small, will inevitably hit the ground at the same time!"

"Only different things, even if they have the same weight, will be different when they fall from a height!"

Lu Ming looked at the iron ball and the wooden ball and shouted excitedly.

Yun Yu pursed his lips, tore off two leaves, and patted him on the shoulder.

Then raise both hands high under the excited look of the other party, and then let go at the same time.

A gentle breeze blows, and two leaves chase each other in the air.

Then, Lu Ming's excitement was gone, replaced by a look of horror.

Because the two leaves of similar size did not fall to the ground at the same time, this means that the conclusion he just reached was completely wrong.

Yun Yu smiled:

"Or? Think again? ”

Lu Ming looked at him sadly and angrily, his fists clenched, and his knuckles were slightly white.

Trembling all over, he gritted his teeth and said:

"You did it on purpose! You already know why, don't you? ”

Yun Yu raised his eyebrows and said proudly:

"Yes, I do!"

That look, as if to say, you beg me, beg me, I will tell you.

Lu Ming took a few deep breaths and suppressed the grievances and anger in his heart.

In the past few days, he has been tortured to death by this question, his head is almost overloaded, and the final conclusion is not right.

The guy in front of him obviously has the answer, but he doesn't tell himself.

What a bastard! In the past, who would dare to do this in Beijing?

After tidying up his clothes and putting his hair back to his head, Lu Ming bowed solemnly, crossed his hands and saluted:

"I also hope that Brother Yun Xian will not hesitate to give advice."

This is a formal etiquette, and although it is not an apprenticeship, it is also a kind of seeking advice.

Yun Yu looked at Lu Ming, who was looking at him after the salute, smashed his mouth twice, and spoke.

"Go get a piece of cloth and some hemp rope."

Immediately, a servant brought the things, and Yun Yu wanted to pass another iron ball, tied the iron ball, tied the rope to the cloth, and made a simple version of the parachute.

Hand it to Lu Mingdao:

"Try again, and see if the iron ball will land at the same time."

The guard went to the roof with the iron ball, and then, Lu Ming was stunned to see the picture of the iron ball with a parachute landing slowly.

Teeth chattered a little asked:

Why is that? Why does an iron ball with a piece of cloth become so slow? ”

"This is because the area of force on him becomes larger, and the resistance of the air also increases, so the speed of his descent naturally slows down."

Lu Ming: "??? ”

I can understand every word you say, but together, please forgive me for my limited knowledge.

Yun Yu saw that he was at a loss, thought for a while, and explained:

"For example, what does a boat do when it travels on water?"

"Wind!"

"Yes, what if it's windy?"

"If the wind is strong, the boat is fast!"

Lu Ming felt that he seemed to grasp something, but he couldn't grasp it.

Yun Yu put on a teachable expression and continued:

"The effect of that piece of cloth is similar to that of a sail, when it unfolds in the process of descending, the wind will blow upward, so that the iron ball will be affected by the force of the wind, and the speed will naturally decrease."

Lu Ming doesn't seem to understand, where does the wind come from? I always feel that there is still a line left, and I haven't fully understood it.

Yun Yu roughly understood his thoughts, so he said:

"You used to ride a horse, you rode a horse on a windless day, you galloped on a horse, can you feel the wind? And when it stops, the wind is gone? ”

"That's right! That's it! I get it! ”

The prince of Qi of the Great Qian Dynasty finally comprehended air resistance at this moment, although this thing seemed to him to be the wind that Yun Yu was talking about.

"No wind makes the wind! That's it! ”

As he spoke, he opened the folding fan, fanned himself a few times, and asked:

"Is that how the fan works?"

Yun Yu looked at him with some surprise, the young man is good, he knows how to draw inferences.

Immediately, he put on that teachable disgusting look and nodded.

"Yes, now you know why the iron ball with cloth fell to the ground, right?"

Lu Ming nodded obediently, indicating that he understood.

"But what about the principle of them landing at the same time? Why is that? ”

"That's because they themselves can ignore the effect of the wind on them, and you try again with the same weight of iron pieces and iron balls to see if they will land at the same time?"

Yun Yu couldn't bear this poor baby to continue to be tortured by the iron ball, so he patiently gave him a vivid physics lesson.

When Lu Ming completely understood, the sky was getting dark, and then he left under the reluctant eyes of the other party.

Originally, Yun Yu's original purpose was to see if the baby was crazy, but after hearing the word Shizi, he immediately changed his mind.

After making up for Lu Ming's reason for entering Beijing, he wanted the other party to reposition himself.

But don't position yourself as a fat pig, or a tool that only makes money, this kind of person has no good end in the past.

If you want to get it, you must also make it into the kind of hermit master who is erudite and talented, full of poetry and books, and knows everything about astronomy and geography.

Such a person, not only do you want to rob a prince, but I'm afraid the emperor will also pay attention to it, right?

He will never participate in rebellion or anything, and he must definitely avoid this kind of suicidal behavior.

To build himself into a hidden image of a master in the world, even if he has to go to the capital to work hard one day in the future, it will not only be under a prince.

Either become the guest of countless people, or hug the emperor's thigh, so that he can live a peaceful and happy life.

Yun Yu has a very clear positioning for himself, and he wants to make some small fortunes by relying on the skinny person and live a carefree life.

is now being targeted by Lu Ming, just in case, the script has been changed, from a simple splash to a knowledgeable splash, and he will continue to live freely in the future.

I ran a school in the sky, learned to pass through many predecessors in the world, flourished miscellaneous learning, and taught science.

As a generation, everyone took their apprentices and grandchildren to wander the streets and alleys, eating and drinking spicy food.

That picture, just thinking about it is beautiful!

Isn't Lu Ming eyeing himself? Hehe, now he's going to turn the hunter and the prey around.

Thought I'd hit the ground with an iron ball? I've got a lot of stuff here.

Want to learn? If you want to learn, just apprentice!

Huh! I won't accept your apprenticeship! you off!

When you really go to the capital one day, you will use your fame to promote it.

"Have you heard? Who is the son, when he was in Qi County, he wanted to worship this person as a teacher, but he didn't accept it, saying that he was talented and stupid......"

As soon as a similar rumor came out, hey!

Lao Tzu will be famous, and if I run the school, I also want money, and I also want talents!

Exclusively accept those who have background and power in the second generation of officials and the second generation of the emperor.

The proper umbrella is here, and whoever wants to move me in the future will have to weigh himself first.

In this instant, Yun Yu had already made various plans in his mind.

and began to put it into action, and training Lu Ming was his first step.