Go to the city gate.

Li Mengxi looked up at the tall and thick city gate. He walked to the edge of a city gate and tried hard to push the door open. It was too heavy. Li Mengxi used great strength, but the gate creaked.

, moving slowly.

Unable to push, Li Mengxi simply gave up.

I looked at the city gate carefully. The city gate has a door shaft, and the door shaft is connected to a large door.

For the lever of a single door, the door axis is the fulcrum.

When pushing the door, the closer you are to the edge of the door, the longer the force arm and the easier it is to push.

On the contrary, when pushing close to the door shaft, the lever arm is short and very laborious.

So, Li Mengxi smiled and asked, "General Guan, and the other three generals, who is stronger among you two?"

"Ha, the second brother and the third brother are as strong as each other." Liu Bei interrupted first. This is Liu Bei's cleverness, not to hurt the harmony between the two.

If Li Mengxi's words caused the two of them to compete with each other, it would not be a good idea.

Guan and Zhang should be as strong as each other. Li Mengxi nodded and said, "I've got General Lao, Guan and the three generals to give it a try.

General Guan pushes the edge of the door from the outside, and the three generals push the door from the inside. The two generals use their full strength to see who can push the other."

Li Mengxi invited the two of them, locked them up, rolled up their sleeves, pushed the edge of the door, and held it in the door.

"Push!" Li Mengxi shouted.

Zhang Fei and Guan Yu immediately pushed the door open.

The result is no doubt.

Guan Yu pushed the edge of the door and easily pushed Zhang Fei through.

Seeing this, Li Mengxi said again, "On the other hand, the three generals pushed the edge of the door, and General Guan pushed the door."

The two of them changed again.

This push also has no suspense.

Zhang Fei pushed the door edge, but pushed Guan Yu back.

Stopping, both Guan and Zhang were thoughtful.

For a long time, Guan Yu looked at Li Mengxi, "I usually push the door, and I know that the edge of the door is easy to push, but I didn't look into it, and it turned out to be a lever."

Zhang Fei laughed and said, "I know! It's his mother's leverage!"

Now, you should understand that pushing the door from the edge is the most effective.

As for the city gate axis, whether you push the door or hit it, it must hit the edge.

However, the city gate is a city gate, the city gate is closed, and there is a door bolt behind it.

If you add a door bolt...

How is the door broken?

Think about two situations.

One is to break the door shaft and open the city gate wide.

Second, maybe the door shaft was not broken, but the siege spine broke the door first.

Especially the second point, Li Mengxi suddenly remembered that the two siege vertebrae made by the army were both battering rams made of wooden stakes.

That is, the hammer head is flat.

It seems that in the TV series, the siege spine is sharpened.

The flat hammer and the pointed hammer exert the same force on the door, that is, when breaking the gate axis at the first point, there is no difference between the flat hammer and the pointed hammer.

But if it comes to the second point, when breaking the city gate and breaking it, there is no doubt that the sharp pressure is strong and it is easier to destroy the city gate.

Thinking of this, Li Mengxi made some calculations.

It seems that the next time I make a siege spine, I have to make the head pointed.

It's not enough to sharpen it. It's best to use hard wood. Otherwise, like willow wood, the sharp end will become soft after being hit for a while. It's as soft as a brush. Every time it hits the door, most of the force will be buffered.

So you have to use hard wood.

In fact, if conditions are sufficient, it would be better to coat the siege vertebral hammer head with iron sheet.

The iron sheet will not become soft when hit.

The hardness of iron sheet is better than all common hardwoods.

Therefore, the iron head siege spine has the strongest destructive ability against the gate.

This is the second case of breaking a door, the difference between a cone head and a blunt head.

But in the first case, the door bolt is inserted behind the city gate. At this time, is it more efficient to smash it in the middle of the two doors, or to one side?

At this time, the object of destruction is the door axis.

Behind the left and right doors, where the door shaft is connected to the door, is the door nose where the door shaft is inserted. The door nose is probably the fulcrum.

If you want to destroy the door shaft, naturally you have to smash the edge of the door.

The question is, is it better to hit the middle of the door crack, or to hit one of the doors on the side?

With Li Mengxi's analytical ability, he didn't quite understand it at this time.

I can't figure out what's going on.

If you hit one side of the city gate, your strength may be concentrated, which is probably equivalent to holding the chopsticks in place and concentrating your strength to break them from one end.

Hitting between the city gates is roughly equivalent to the fact that the chopsticks are fixed, the force is divided into two parts, and they are broken from both ends.

Li Mengxi guessed that the city gate axis would be more likely to break if hit sideways, but this was just a guess after all, and Li Mengxi didn't know if the analysis was correct.

Simply, just push the siege spine to try it out and do the actual experiment.

During the siege yesterday, there were four siege towers, one was broken, and three were intact.

So he ordered the soldiers to push the siege spine over.

After a while, the soldiers slowly pushed the heavy siege tower forward.

Then, the people behind closed the city gate and inserted the door shaft.

He also ordered his soldiers to lightly shake the siege spine and hit the gate, hitting the center of the gate first.

Boom.

Boom.

The siege vertebra hit the center of the city gate one at a time. You can see that the siege vertebra hit two city gates at the same time, and both gates were slightly deformed inward. When the city gate deformed inward, the door shaft was pinned to the door.

If the shaft is broken, it is broken.

Li Mengxi also discovered that because the city gates were not completely horizontal, one side of the gate was convex on the outside and the inside of the gate was concave on the other side. Therefore, when they hit, there was always a sequence. The siege spine hit one gate first, and then hit the other gate behind.

The strength of the door gradually decreased, and the door swayed back and forth, like a spring.

Li Mengxi felt that this might be a waste of kinetic energy.

For one door, the elasticity is calculated alone, but for two doors, the elasticity is added together, and the kinetic energy wasted is even more.

After bumping for a while, Li Mengxi ordered to stop.

Turn the siege vertebra slightly, and aim the siege vertebra at the left edge of the city gate.

Boom.

Boom.

After another collision, it was obvious that the deformation was much larger when it hit the edge of the left city gate alone.

If the door shaft is broken by the city gate going inward, then there is no doubt that when one of the city gates is hit alone, the gate will go deeper inward, causing greater damage to the door shaft and making it easier to damage the door shaft.

At this point, Li Mengxi believed that it would be more efficient to hit one side of the city gate alone.

This involves waste of kinetic energy and deformation of the city gate.

Unable to make up his mind, Li Mengxi asked Liu, Guan, and Zhang, "Do you think it would be faster to break the door if you hit it in the middle or to the side?"

The three of them, Liu, Guan, and Zhang, were fascinated as they watched the city gate being knocked down, and watched as the gate on one side kept moving inwards.

"I think..." Liu Bei touched his chin, frowned slightly, and looked like he was thinking. He hesitated for a moment, "It would be better to hit one side."

"I think so too." Guan Yu also gave the answer based on his feeling.

"Me too!" Zhang Fei responded in the same way.

This chapter is not over yet, please click on the next page to continue reading! Four to zero, everyone thinks that it is faster to hit the goal on one side.

"Then it's settled, if you bump into the door again in the future, hit the door on one side!" Li Mengxi concluded.

Liu Bei nodded, while Guan Yu hesitated slightly. Guan Yu brushed his long beard with his hand, looked up, and stared at the middle of the tall city gate for a long time.

"If we say that the fastest way to break a goal is, the higher the siege spine is, the faster the goal will be." After Guan Yu finished speaking, he didn't look at Liu Bei or Zhang Fei, but looked down at Li Mengxi.
To be continued...