2fae=ingLiU to send a message, what is the name, raw; play, syringe. , currency; now I ask you a few questions to twitch the part of the piston that will move, life plug. Teacher: What is the part of the pointer eye, raw: needle. Yes, we can also call it a needle eye. Now we start playing with the syringe. I put the needle eye in the water and twitched the piston. What happens? Health: Water will enter the syringe. Teacher: Did the demonstration see it? Health: Qi. I saw it. If I push the piston by hand, what happens will happen, and the raw water will shoot out from the eye of the needle. Teacher; the demonstration water really went out. Teacher: Demonstration Now, after I pumped in the water, I blocked the needles and pressed the pistons. What would happen, why, I couldn’t press it because the water could not come out. Teacher; the water does not go out, the position inside the syringe is occupied by water, and it will not be pressed. Who wants to try the students to press the piston forward, indicating that the pressure does not go down, we just guessed it. Now the teacher pressed the water out and twitched the piston. Now there is something in the syringe. Health: There is air. If I also press the piston down, what happens? Life: the air will be pushed out of the needle by the piston. Teacher: Looking at the pupil's face against the pupil's face, do you feel the pressure on the piston? Coin: Now I plug the needle eye and press the piston. What happens? Why, the student: the piston will not press because the air is in the needle. Can't run out of the tube. Teacher: You mean that the position in the syringe is occupied by the air, the air does not run away, the piston can't press it, is it, life: the students go to the test, doubts, self-speaking seems to go down... a little not The sampler has prepared a syringe for each of you. Please try it out and see what is wrong with water and air. Coins; we exchanged the discussions in each group. Health: I feel that there is air blowing on my fingers, but I can't get out. Health: The air can be pressed down in the syringe, and it will be bounced off after letting go. Water will not. Teacher; what you mean is that the syringe is filled with water, the piston can't be pressed down; the syringe is filled with air, and the piston can be pressed down. Did you tell us what it is, the air can be compressed. , currency: What does compression mean: it is getting smaller. agree. This is the first result of our brains today, I will record it on the blackboard. Board: Air can be compressed by the contractor: Can we take a monthly teaching of this compressed air? Primary school version of the name, currency: Just when the piston is pressed, what is the feeling of the hand, life: the hand can not press, a little hard to press. Coin: Is it like there is a force to push back, clever: This force is where you think it is from, life: probably after the air compression. Health: Air compression, there is this force. Coin: You can give this force a name, and tell the truth? 9 students: compression, because compression has this power. Health: Elasticity, because it will bounce up after pressing down. Health: Resilience, because the pressure will rebound. Teacher: You have more than the name you just took in the opposite direction. Teacher: You mean, the compressed air is elastic. Do you agree to send a statement? Teacher: Board: There are a lot of elastics. In other words, we take these kinds of arguments. Teacher: We just got a lot of brains and got a very important research result. Now we are getting up and playing, okay, teacher: Demonstration; stuffing a small paper group into the needle eye of a syringe. If I press the piston, what happens? Why, raw: paper will pop up. Because the air is elastic. Health; air compression, elastic force is produced. The paper ball will pop up. , currency: degree is a possibility, there will be other situations, life: the piston will bounce back because the paper group blocked the needle eye. Teacher: Is there any possibility of the first seed? If the pinhole is too tight, the piston will be too hard to swell, and it will be born. Town coin: Now, let us try what will happen. As the presentation, if the paper group pops up, it is estimated that it is still a little painful. We are still better at pinholes. Demonstration results: The paper ball pops up and the sound occurs. The student makes an exclamation coin: Is it fun? Health: Start playing and play with a toy to get a name. Health: Air gun, because there is air inside, use the elasticity of the air to hit the bullet out. : Can you beat people?: No. Teacher: Board: Air Gun: Compression gun. Bomb gun. Rebound guns. Guns are more than coal guns, because they are hitting the sky. Currency: Names are taken by people. The last thing that can be passed down is to get a better name. I think the names you have taken are all circulated. , currency; have you played enough, Health: No. Teacher: Unfortunately, our class time is too short. If you still want to play, what should you do? Health: Go home and do it. Coin; you will do it yourself, it’s amazing, you can talk about how to do it, give birth; go to the hospital to buy a syringe. Health: The whole class laughs: Buy one, it's very simple. If you don't spend money, you can use a plastic tube and put the small wooden stick into a plastic tube. Teacher: You are very smart. Health: You can use a rubber tiger plug for a plastic in Lange. Just fine. Coin: It’s really a brainstorming. If the plastic tube can't be found, what should I do? The teacher made a self-made air gun. This is a bamboo tube. This is a narrow-skinned slash. Now try to see the spirit is not spiritual, the words of the spirit, you go back to do play. The teacher demonstrates and explains the method of operation. The first bullet was smashed, and the second bullet was stunned again. hair. The root of the scorpion, the value of the money, it is worth the money. I think you are very eye-catching. This thing has the most value for two-point iron to buy and play. Teacher: The teacher has a fun thing to introduce to everyone. Two syringes are shown, the needle eye is connected with a rubber tube and covered. The first demonstration: press the two pistons at the same time and press them up... Come on the second demonstration: press the piston and press the piston to come up: surprisingly. Ah, coin: Can you guess what happened? Health: It may be that the pipes are connected below. Coin: Want to see it? Show the occluded part. You are so good, guess it. The teacher invites you to play with two groups. Student experiment operation. Now, who can give the class a topic, live: a compressed air. Coin: This topic is easy to understand. Health: It will bounce. Because it is filled with compressed air, the compressed air is elastic. Teacher: Think about what kind of supplies are usually made using the principle of compressed air. :sprayer. Lighter, with compressed air, you mean to want to invent a lighter that uses compressed air to ignite, division; it is quite amazing. In fact, all the items in our daily life are invented by people. The key is whether you want to come out. I want to invent a car that can be inflated. When you don't use it when you don't use it, you can inflate it when you don't take up the place. Health: A device with compressed air is built on the mouth. If the thief comes, pushes the mouth, the air is compressed, and the rebound force is generated, the thief is bounced. Health: The TV made of compressed air can be turned on when you are on your body. Teacher: Some things will definitely occupy the international city in the future: compressed air rockets, after playing well, can fly to heaven. Health: Compress the umbrella. When the weather is fine, let go of the air and fold it up. When the weather is raining, the umbrella will open. In addition, when crossing the sea, turn the umbrella upside down and use it as a ship. Health: Multi-purpose shoes, usually no gas in the soles. If it rains, the soles will be inflated and the feet will not be wet. Coin: You have a lot of good ideas, let's talk after class. Of course, it is not too late to make it last for people to use, only to have real value. The teacher also made a toy made of compressed air. Show the empty Coke bottle; show the rubber stopper in the laboratory; point to the rubber plug and cut the tire on the tire; while demonstrating, explain: the stopper is tight, from the mouth, Inwardly cheering up, you said what would happen, Qiao: It’s good to go to the open space to demonstrate. The Coke bottle popped more than ten meters high to help me give this toy a name, a cannon. Cola timed shells. Air cannon. 1 material bomb teaching monthly. Primary school edition Injection Molding,Polycarbonate Injection Molding,Custom Injection Molding,Thermoplastic Injection Molding Ningbo Rongna Technology Co.,Ltd , https://www.service-machining.com