Qin Yunfei did not continue to explain, but chose to continue teaching her.

If three days passed, those soul warriors would also be able to produce high-density bearings normally under Qin Yunfei's guidance.

After the first batch of bearings was produced, it was also faced with Qin Yunfei's first collective lecture.

It's still that factory, it's still Qin Yunfei and those soul warriors.

It's just that the role they play has taken on a new level.

Standing on the platform, these soul warriors held small notebooks one by one, for fear that the lessons taught by Qin Yunfei would be wasted because of their laziness.

However, in order to take care of the physical foundation of these people, Qin Yunfei mainly talked about friction, resistance, potential energy and kinetic energy in this class.

Hearing these new things, these people all showed solemn eyes.

Because, although the exercises they once practiced were subtle, they could not explain some of their connotations.

However, what Qin Yunfei said didn't seem to have the slightest bit of power, but they heard it clearly.

But even if they could understand it, there were still people among them who doubted whether what Qin Yunfei said would be able to make them have enough strength.

"Qin Shao, I want to know, what you said can really make me have stronger strength?"

This question is not just the idea of any one of the many soul warriors, one person asks it, and everyone speaks.

"Yes, Qin Shao, these truths you said don't seem complicated, can such a simple thing really cast a powerful attack?"

In the midst of so many inquiries, Qin Yunfei was not in a hurry, he took a stone and walked out in front of everyone.

"Look, what do you think of this fast stone if it is soaked in water?"

As he spoke, Qin Yunfei threw it into the cooling water of the cast iron next to him, and there was no movement.

Everyone shook their heads, indicating that there was no change at all.

In this way, Qin Yunfei controlled the soul power of the water system, dragged the stone out of the water, and held all the water in the air, from top to bottom, drop by drop, and it happened to drip on the stone.

"Look, what do you think, if so?"

Drop by drop of water fell on the stone, and although the stone was swept up with layers of dirt and dust, it still did not change much.

People shook their heads again, because these theories were all taught by Qin Yunfei, and the effects shown were so superficial, so they couldn't help but feel a little disappointed in their hearts.

Some people even thought in their hearts that maybe what Qin Yunfei was teaching was just a theory, or maybe it was just a kind of superficial common sense.

But just when everyone was disappointed, Ling Qi asked in surprise, "Qin Shao, do you still have a backhand?"

With just one sound, everyone's eyes were focused on Qin Yunfei's body.

Sure enough, in the midst of everyone's expectations, Qin Yunfei suddenly laughed, he poured water down from the air, but the water was not all sprinkled, but according to the previous trajectory, from the point into a line, a bundle down, like a lead, all dripped on the stone.

"Qin Shao, is there any difference between this and before?"

Under the puzzled questioning of everyone, they saw that the stone, starting from it, was directly penetrated by water droplets.

Qin Yunfei didn't answer their inquiry, but the corners of his mouth raised slightly, and asked, "Everyone, do you think this is the case at this time?"

Everyone was shocked beyond measure, looking at the object in Qin Yunfei's hand in horror.

"Qin Shao, what do you mean, you need us to insist?"

Water drops wear stones, this well-known thing in the world where Qin Yunfei lived before, but at this time, in front of these people, it has become a perfect fable.

But Qin Yunfei didn't agree with their explanation, he just shook his head and smiled slightly, "No, I just want to say that quantitative change causes qualitative change." When your efforts reach a certain level, nature can achieve perfect change. Of course, you think it's just one of the most common phenomena, so I can show you this. ”

To be honest, Qin Yunfei threw the spring he had built before on the ground.

"Go and try it and see who can hold it down. ”

He threw it out, and immediately someone stepped forward to try it, and after bending the spring, the man laughed, "It's very simple." ”

Everyone laughed, but they didn't take it seriously.

But Qin Yunfei showed a hint of a smile, and put the three springs together to make a composite spring, which he threw on the ground.

"Which of you would like to try it now?"

The soul warrior from before, when he saw this scene, stepped forward again.

"I'll do it anyway, it's too easy to ......"

As he spoke, he went up to press the spring, but this time, he couldn't even press half of the spring, and the whole person was stunned.

"This ...... How is this possible? It's just three, and I can easily suppress one of them just now......"

At this time, not only he was surprised, but everyone present looked at the spring in front of him in surprise, and they all looked in disbelief.

"Qin Shao, what's going on?

Under everyone's inquiry, Qin Yunfei began to explain the key to it leisurely.

This is the difference between a force and a concentrated force. You think that every spring has only the same power. In fact, it is the same spring, the same material, but the size of the completed structure is different, and the toughness of the metal is different. In this way, there will also be differences in the force coefficients. ”

"For example, there is a difference between the maximum force and the force coefficient that can be withstood by a diameter of ten and a diameter of five and a length of ten. And these three springs are put together to form a spring combination, in this combination, not only the toughness is greatly improved, but even the ultimate force they can withstand will also change. ”

As he spoke, Qin Yunfei deformed several springs for the second time, and at this time constructed a new duplex structure.

"You think they're a combination of springs, but I think they're mechanical beings. ”

As he spoke, Qin Yunfei threw it away, and the three springs instantly retracted their original appearance.

"Peng!", Qin Yunfei's hollow stone, which was originally hooked with a spring, was instantly bounced out, and its speed almost reached the speed of sound, and it also let out a "buzz!" chirp.

The stone was watched by the crowd and eventually hit the wall.

"Boom!" In the loud noise, the stone wall was stunned to pierce a hole a foot thick.

Seeing this scene, the soul warriors present no longer underestimated the spring in front of them, and they looked at all this in front of them in horror.

"Qin Shao, is this kind of attack really just done by this kind of spring group?"

Facing everyone's inquiries, Qin Yunfei smiled and said, "Did I use my soul power just now?" You are all watching, whether I use it or not, you know better than anyone else." ”