Back to Chaos Star, Tianfang was called away by Ma Lao for the first time, the reason is that after a lapse of three years, the prototype of the armor required by Tianfang has appeared, and then many things Master Golden Hammer does not understand very well, and Tianfang needs to go over and explain. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

The casting room of the golden hammer master is very luxurious, in the middle of a Nine Dragons Tianhuo Ding, specially used to smelt all kinds of materials, not far away is the casting table, used to smelt the smelted materials thousands of times, remove impurities, hammer molding, the casting table is a cold pool on the side, gushing out of the cold.

When the sky was released, there was already a more exquisite armor than Tianfang imagined standing on the edge of the casting table, the whole armor was black, but the edges of all the parts were filled with gold wires by special materials, and the complex and exquisite formation on the armor formed a piece of pattern, which attracted the entire attention of Tianfang the moment the sky was put in.

"Wow, master, you're amazing, it's even better than I thought!"

"That, God, this frame of the armor is built, but I don't really understand your thing called an ion propulsion device, you can explain this to me!" The master said with a flattering face, as a top grandmaster, there was nothing on the road of refining before, which could move the golden hammer, but the design given by Tianfang seemed to put a door in front of the golden hammer master, and the golden hammer master felt something, but he couldn't push this door open.

Tianfang also has a headache, to explain the principle of ion thruster to the old man at once, you must start from the basic chemistry and basic physics, this thing involves a lot of knowledge, and it is not clear in a short time.

The particle thrusters on the earth have been developed for decades, and they can reach the level of ion thrusters made by the sky, and the things above are no longer more advanced due to the limitations of material science, so the ion thrusters on the earth are mainly used in satellites, and cannot be used for applications such as airplanes and rockets, let alone large particle thrusters like movies, to promote super-large spaceships.

Tianfang thought about it, decided to teach this knowledge system to the Golden Hammer Master, Tianfang saw the thirst for knowledge from the master's eyes, this rare and valuable spirit, let the sky let go of his determination, and he really didn't have so much time to get all these core technologies out of his own, always find a trustworthy person to teach it, simply this core technology will be taught to the Golden Hammer Master, I believe that with his character, he will not teach it to others privately.

"Master Golden Hammer, this thing is very important to the future development of our Immortal Palace, very important, I hope you will not pass it on after you learn it! Also, Master Little Hammer is too! I like to teach the principle of this thing to the two of you!" Tianfang said solemnly.

"Well, I promise that I will not teach this principle to anyone else unless I have your permission!" said the Golden Hammer Master solemnly.

"Okay, this thing involves a lot of knowledge, so now I'll explain the principle of this thing from the very beginning!" Tianfang said.

"First of all, it is force and reaction force! What is force, force, is the action we exert on something, for example, I want to push this Nine Dragon Ding, when I push it, there will be a thrust! What is the reaction force, that is, when we push this Nine Dragon Ding, the Nine Dragon Ding will produce a force of the same size to us, but the direction is completely opposite, this force is the reaction force!"

"Hey, wait, I can understand the force, but I don't understand the reaction force! How do you prove it?" Master Golden Hammer was exposed to this kind of knowledge for the first time, not like the students of the earth, and when he reached junior high school, this knowledge was almost unanimous.

"I'll explain to you in a moment and force and reaction force, now I'll classify the force, there are many kinds of force, for example, we push something, this force is called thrust, we jump up if there is no other force, it will fall vertically, this force is called gravity, we pull something forward, this is called pull, and we rub a thing like this, there is friction in it!"

"I'm now using gravity to explain force and reaction!" Tianfang took out a spring scale, which was made by Tianfang when he was in Tianhaoxing, and it had not been used for a long time.

Hanging an iron ingot on top of the spring scale, Tianfang asked, "Just talking about gravity, everything has gravity, right, so why didn't this iron ingot fall to the ground now?"

Jin Hammer was suddenly asked, thought about it, and said, "Isn't there this Luo Circle-like thing hanging?"

"Yes, this ring is called a spring, and the spring pulls this iron ingot, which produces a pulling force, and this iron ingot has weight, and there is gravity, and the two just cancel each other out, so this iron ingot can be still here! This pulling force is the reaction force of the gravity of this iron ingot!"

Tianfang put the iron ingot on the ground: "Master, please push this iron ingot with gentle force, the iron must remain still, but your hand must use a little force!"

"Very good, you clearly push this iron ingot with all your strength, why doesn't the iron ingot move?" Tianfang asked again.

"This ......" Master Golden Hammer was really asked this time, like when he was hanging in the air just now, it was obvious that there was something hanging, but the back of the iron ingot pushed by himself here was not blocked by anything at all, it was air, but why didn't the iron ingot move? Any middle school student on the earth could answer, but Master Golden Hammer didn't know.

Tianfang looked at Jin Xiaohammer: "Master Xiaohammer, do you know?"

Jin Xiaohammer also looked thoughtful, but there was no answer.

"As I mentioned just now, there is a force called friction, this iron ingot is placed on the ground, is it in contact with the ground, this contact surface has no friction when you don't push, only the force of the ground supporting the iron ingot and the gravity of the iron ingot cancel each other, but as soon as you push, this surface will produce friction of the same size as your force, canceling each other, which is also force and reaction force!"

"Look at this inclined plane!" Tianfang took a wooden strip out, then found something to raise one end, put the iron ingot on it, and then found a round bead and put it on top of the wooden strip, the iron ingot did not move at all, and the round bead rolled out far away.

The golden hammer suddenly had a flash of inspiration: "Friction, yes, friction, find an iron ingot that didn't slide down because his contact surface is large, and friction and his gravity cancel each other out, but the bead has no friction due to the small contact surface, isn't it?"

"Very good, master, you can already draw inferences, but the friction of this iron ingot is not his weight, because there is an angle here, this calculation is more complicated, let me give you a feeling!"