Not knowing how to solve the problem, Li Mengxi took the broken piece of wood and began to think deeply.

As he meditated, he forgot his surroundings and time.

It's been too long.

On the side, Liu Bei and others waited for Li Mengxi for a long time, but did not see Li Mengxi move.

Liu Bei and Guan Zhang looked at each other.

Liu Bei came over, patted Li Mengxi on the shoulder, and asked softly, "Xi'er, what are you thinking about?"

Li Mengxi looked up blankly, "Stairs."

Liu Bei glanced at the broken piece of wood in Li Mengxi's hand, looking for something to say, but also to see that Li Mengxi frowned and wanted to explain. Liu Bei laughed, "What's wrong with the piece of wood being broken? If it's broken, there's still this long section, and it can be used again if it's broken.

Make a little siege ladder."

This statement is also philosophical.

As if to persuade Li Mengxi, there is no need to worry about breaking the wood. The long ones can be broken into short ones, and they can be used. Just like this life, why bother to frown all day long...

Li Mengxi was still immersed in thinking. He looked at the wooden stick in his hand blankly, then looked up at Liu Bei, "Can this be used?" The implication is that the wood is willow, soft and brittle.

Can it be used?

Liu Bei smiled and said, "Why not? Just like chopsticks, you can use them if they are long, but if they are broken, you can use whatever is broken..."

Liu Bei and Li Mengxi were not on the same channel at all in this round of dialogue.

However, when Liu Bei suddenly mentioned chopsticks, Li Mengxi suddenly felt as if he had caught something.

After a moment, Li Mengxi's eyes widened suddenly. He remembered a well-known fable, one chopstick can be easily broken, but two chopsticks cannot be easily broken.

That is to say, since a wooden stick is easily broken by a stone, why not tie two wooden sticks together so that they can be broken easily?

besides!

Anyone who has broken chopsticks knows that a long chopstick is easy to break, and then if you pick up the broken half chopstick and break it again, it will continue to break, but then, if you want to break a quarter of the length of the chopstick, it is almost——

Difficult to break!

The chopsticks are all folded by the same person and have the same strength. Why is it that the shorter the chopsticks are, the more difficult they are to fold?

It may be the principle of leverage, that is, when breaking chopsticks, the fulcrum is in the middle and the force points are at both ends. The longer the chopsticks and the longer the force arm, the easier it is to break the chopsticks.

In the same way, the shorter the chopsticks and the shorter the force arm, the less likely the chopsticks will break.

It seems to be the same when a stone hits the steps of a siege ladder. The stone falls down and hits the middle of the ladder. With a click, the ladder breaks. Then, at this time, the situation is different from that of folding chopsticks. The fulcrum of chopstick folding is in the middle.

The force is at both ends. If a stone hits a step, the opposite is true. The force is applied in the middle and the fulcrum is at both ends, but the principle is the same.

The longer the ladder is, the longer the force arm will be when a stone hits the ladder, making it easier to break the ladder.

On the contrary, the short steps are not easy to be broken, and the ladder is strong.

This chapter is not over yet, please click on the next page to continue reading! Thinking of this, Li Mengxi looked at the siege ladder again and immediately understood what the problem was.

The siege ladder was made too big and too wide. Compared with the siege ladder in Wen'an County, the steps were more than twice as wide. Therefore, the steps were more than twice as long, so it was equivalent to becoming a short chopstick.

Because chopsticks are longer, they become easier to break.

Li Mengxi once thought that the width of the siege ladder was not important. It would be fine to be wider or narrower. But now he understands that the width is very important! If the siege ladder is made larger or wider, it will actually become fragile.

The fault of this siege was that there was enough wood, there was enough time, and everything was sufficient. The carpenters were serious and conscientious in making the siege ladder large, wide and very impressive.

But because of this, the ladder was destroyed and people died.

It would be like this.

Li Mengxi's eyes flashed. He stood up and looked at Liu Bei with excitement. "I figured it out!" he shouted.

He looked at Guan and Zhang again, "I understand! It's his mother's lever!" He jumped up excitedly.

Guan and Zhang looked at each other, what is "his mother's leverage"?

Without waiting for Liu Guan and Zhang to ask, Li Mengxi was very happy and couldn't wait to tell others about his discovery.

I searched everywhere and found a wooden stick.

Comparing it to a wooden stick, "Look, you three, if you compare this stick to a ladder, the stick will be long, but if you push it, it will break."

As he spoke, Li Mengxi made a click and stuck out the stick.

"Reduce it by half and push it out again, which will take a lot of effort." Click, Li Mengxi pushed it out again.

"If you reduce it by half, it will be more strenuous."

In the third case, Li Mengxi stuck out his stick three times, leaving only a short length of stick in his hand.

He said, "Pull out the stick with force, but the force does not change. If the stick is long, it will be easier to stick, but if it is short, it will be difficult. Why? It's a lever!"

What is a lever, this is the fulcrum, this is the lever arm..."

After a brief talk, Li Mengxi said, "These steps are like wooden sticks. When rocks fall from the city, the longer the steps are, the easier they are to break, while the shorter ones are stronger."

Therefore, the narrower the siege ladder, the better, do you understand me?"

Liu, Guan, and Zhang all had their brows furrowed, looking thoughtful.

There is no need for Li Mengxi to explain too carefully. The three of them, Liu Guan and Zhang, have rich life experience and can easily understand that whether they are folding firewood or plucking bamboos, long ones will break easily without any effort. If they are short, they will take a lot of effort.

It's not easy to break either.

The three of them did not expect that the principle of the siege ladder was the same as the principle of breaking the stick.

A man breaks a stick, and a stone hits a ladder. The longer the stick is, the easier it is to break, and the longer the ladder is, the easier it is to break.

After a while, the three of them came to their senses.

Liu Bei nodded and said, "The siege ladder should be narrow rather than wide. No matter how wide the ladder is, two teams of people cannot climb it. Otherwise, the two parties will disturb each other and it will not be beautiful. Therefore, the ladder is only for one person to climb.

It doesn’t have to be wide, just enough so that one person can get up and down.”

Li Mengxi scratched his head, "Oh!" He looked at Liu Bei with wide eyes, a little surprised.

I didn't expect this.

What Liu Bei means is that it is best for a siege ladder to be climbed by one person. Even if it is wide enough for two people to climb, in fact, when climbing, the two rows of people will interfere with each other, which is not conducive to climbing. Moreover,

If the ladder is wide, it will be easily broken. Considering these two considerations, it is natural that the siege ladder should be narrow.

Guan Yu pondered for a moment and then said, "Xi'er, when we were defending the city, we had a fork pole. If when we attacked the city, the ladder was narrow, it would be difficult for him to push the ladder with the fork pole, which is also a benefit."

Li Mengxi turned his head and looked at Guan Yu again, "Oh!" His eyes widened and he was surprised again.

Li Mengxi is familiar with the city defense fork pole. He was the one who came up with this thing.

But at this moment, he didn't expect that the ladder was narrow and could resist the enemy's push.

To put it simply, if the enemy pushes a one-meter-wide ladder and pushes a one-meter-long ladder, he will be able to climb over the ladder wherever he pushes.

But when the ladder is as narrow as half a meter, the enemy has much less focus to push the ladder. Maybe when the ladder was originally one meter wide, the people on the side can still push the ladder. After the ladder is half a meter narrow,

People can't reach it.

In this way, when the ladder is one meter wide, seven enemy people can push the ladder together. When the ladder is half a meter wide, four enemy people can push the ladder together. Therefore, the possibility of our siege ladder being overthrown is much smaller.

Guan Yu said again, "The ladder is narrow, which saves labor materials and hours. The ladder is light, and it is much easier to lift the ladder and escalator."

"Oh!" Li Mengxi said again.

I didn't expect this.

The narrower the ladder, the lower the labor and material requirements. For example, for a wide ladder, long wood is needed for the steps. Without long wood, the steps cannot be made. For narrow ladders, short wood can be used, but long wood needs to be sawn short.

It can also be used, which makes the materials much richer.

As Guan Yu said, the narrower the ladder, the lighter it will be. The siege soldiers can run faster if they carry the ladder. If the ladder falls over, they can pick it up faster.

It relies purely on human power, is lighter than heavy, and is much easier to use.

On the side, Zhang Fei scratched his head in confusion, looked at Li Mengxi, and asked hesitantly, "Xiao Meng, you are talking about fucking leverage, I understand.

If it has a branch and an arm, it is a lever."

"Yesterday when I attacked the city gate," Zhang Fei opened his big eyes, looking like he was thinking, "when I broke the first city gate, I hit the two gates in the middle.

As for the gate of Wengcheng, I saw that it was hit against the gate on the left."

"According to you, which one is right? Which one hits faster?" After Zhang Fei finished speaking, he looked at Li Mengxi.

This time, a troublesome question was raised for Li Mengxi.

Li Mengxi was immediately asked.

I don’t know how efficient it is to attack the city by hitting the gate!

It may be a lever, but where is the fulcrum and which is the lever arm?

Li Mengxi thought for a long time but had no idea. He looked back and then looked into the distance, "Let's go and try looking for the city gate."

The east wall is the direction of the siege, and the city gate has been destroyed.

After a long circle, we reached the south gate.
To be continued...