Gewu, originally Yang Heng thought that this was a very good lesson, but it was just physics in his previous life, but when he stood in front of everyone, he suddenly realized that this was a very difficult question, if people at this time didn't know a little bit of Gewu's knowledge at all, it would be false, but if they knew Lu Dao, it would also be false.

How to explain this, it seems to be a bit contradictory, but look at the following example to know that there is no contradiction.

"You've all hunted, haven't you?" Everyone originally thought that Yang Heng, the proprietor, was going to ask them something, but they asked such a topic, hunting, who has not hunted, when the food is not enough to eat, and when there are people who are forced to be mountain bandits, they have no food, so they have to come to hunting, but hunting is varied.

"I've shot my prey with arrows," "I've dug traps, I've caught prey with traps, I've caught wild boars." "I've practiced throwing stones, I've used stones to hit small prey." ……

There are many ways to hunt, but to sum it up, there are only two methods, one is the long-range attack method, and the other is the ambush method.

"Okay, let's not talk about these methods of digging traps and laying traps, let's talk about archery and throwing stones, you say, when you hit the active prey, do you shoot directly at the prey?"

"No, no, the owner is the owner, and I don't even know how to hunt, it's really a blessing." Everyone talked nonsense, and there were still people who envied Yang Heng as the owner, what does this have to do with whether he can hunt or not, you can't catch up with the prey I hunted in your life, but Yang Heng is not here to be angry. It's about explaining something.

"Okay, tell me, how do you hunt?" "Me." Scratching your itchy flesh or what, isn't it just talking about hunting, what are you proud of, this person actually seems to be talking about his glorious history or something, "When I was hunting, I couldn't hunt, I couldn't hunt for anything." It's because I've been hitting the body of the prey, you think, the prey is running. Don't say it's running sideways, even if it's running along, it can't hit, until one time I consulted an old hunter. He explained a truth to me. When the prey is running, as long as you aim at the front of its head, it is easy to hit the prey, so that I can hit more prey, basically I encounter ten prey, and I can hit one or two. He looked around triumphantly, as if he were some kind of general. Then he sat down.

"What about you?" Yang Heng asked another person, and this person looked a little weak-hearted. "I, I, I'm five prey to two or three, how do I hit it, I use stones to hit, at first I can't hit it, but then I accidentally found one thing, that is, I can hit the front of the prey, so that the prey basically won't run, but some prey can't be killed with a stone, when it hits it, when I go to pick it up, it gets up and runs, if I have a bow at that time, it will be fine."

"Quack," I don't know which mountain secret guard accidentally alarmed the bird, and Yang Heng was also moved, he heard that the bird was flying overhead, so he loaded a handful, just threw a handful of stones in his hand, and as a result, a stone knocked the bird down. Let you make fun of me, "What I'm going to tell you tonight is Gewu, don't say how mysterious Gewu is, first of all, I asked you that hunting is a kind of Gewu, that is, kinematics, do you know what to do to hit the front of the head of the prey in motion, this is a profound question, and the bird I shot, do you know what the problem is, that is to hear the sound and distinguish the direction......"

Starting with interesting things, even things that are closely related to people, will have an unexpected effect, and this lesson is very successful, because everyone has gone through difficult times, and if they happen again, they may be able to make a living by hunting.

"Do you all understand?" "I understand, what you said is that if we shoot fast enough, we can directly aim at the prey, and even as long as we aim at its head slightly, and the farther away the prey, the more we need to advance, but the host, we still have a problem, that is, when the arrow is far away, what will the arrow fall down in a curved route." I didn't expect it, I didn't expect that although these people have no culture, they will draw inferences.

"Well, you have to start with apples, ah, it's not called apples at this time, then it's those mountains that are red, let's start with the mountains are red, or any kind of fruit on the tree, you say, the fruit will fall when it's ripe, and it will hit your head, right?" Yang Heng pretended to be up again, this time it made sense, I will first occupy the story of this apple falling for you, see how your surname Niu still makes the apple smash his head, but Yang Heng is wrong, this apple may continue to smash the head surnamed Niu, maybe he will continue to come out with an apple to smash the head theory, maybe more than a thousand years later, Huaxia will argue with the West, whose head did this apple smash first, or maybe there will be a stick country that is not a stick country fighting for its own merits, The person who was smashed on the head by the apple in history is a member of our stick country, and this will become a public case after all.

"The fruit hits the head, the fruit will naturally fall when it is ripe, and when the fruit falls, won't you avoid it, don't you like to be hit on the head by the ripe fruit?"

Everyone talked about it again, they were not afraid of Yang Heng at all, yes, usually Yang Heng was always hip-hop, so naturally they would not be afraid, but what they were afraid of was the housekeeper.

"What is it for, what Brother Heng said must have his reason, is this the same as archery, the arrow is falling towards the ground, and the fruit is also falling towards the ground, not towards the sky, but everything in this world is falling to the ground, but I haven't seen the sky in the past, by the way, the smoke and dust seem to be floating towards the sky, and it can be regarded as falling towards the sky, right?" At this time, not only Xiao Niang, but also Changle and Yu Zhang were frowning and thinking, and even nodding at Xiao Niang's self-talk, so everyone also thought about it.

"This, let me tell you, for you, there is still a certain difficulty in understanding, but I still want to tell you that I gave this phenomenon a name, called gravity, that is, the earth can be attractive to anything, even the smoke and dust that Xiaoniang said just now will be attracted by gravity."

"Owner, what is gravitational force for Lu, is it not called gravitational force for billions, or it is called gravitational force." Yang Heng found that these people didn't give a whole meal, and they actually started to laugh The owner came, this is worth it, what else do I have in the future, prestige, but, but how can I fix them, killing people and demonstrating, I really can't do it, and I can't do it by beating a hundred killing sticks, but it's just talking and laughing, how can I beat people's sticks, let's do it first, so it doesn't seem more popular.

"Okay, okay, don't discuss it, it's called gravity, that's the name of a person surnamed Niu in the far west, if you don't accept it again, I'll let the saint give the next holy decree, and it will be called gravity in the future, and while the surname Niu didn't put it forward, let's grab this one of him first, okay, that's it, what, you don't understand, is this very understandable, the two of you hold hands and retreat from each other, by the way, is there a big pull, this gravitational force is the hand of the earth, It's pulling your body as a whole, even anything on the ground, it's called gravity, and you don't understand it, but when the fruit is ripe, you sit under the fruit tree, and let the fruit hit your head and hurt for hundreds of years, you may understand. "You make fun of me, and I'll make fun of you.

"Okay, let's review it, ...... today" (to be continued......)