When Xu Yingen, class 2 (1) of Nanmo primary school in Hai'an County, Jiangsu Province, had a life class this afternoon, Mr. Li said mysteriously to us: "children, let's do a little experiment in this class, OK?" We all cheered: "good! Great Mr. Li first used scissors to cut a piece of white paper into many small pieces of paper and put them on the platform. Then he took a plastic ruler and kept rubbing it on his head. After rubbing for a while, he quickly pressed the ruler on the small piece of paper, and then gently lifted the ruler. Eh, the small pieces of paper have been sucked up to the ruler. It's amazing! We all asked curiously, "Mr. Li, why are small pieces of paper sucked up to the ruler?" Mr. Li said with a smile: "because the plastic ruler and hair friction generated static electricity, so it can absorb the light pieces of paper." Oh, so it is! Instructor: Wang Shengxiang and sang Haiping's interesting small experiment today, the teacher assigned us to go home to do a small experiment and write an article "interesting small experiment".
When I got home, I asked my mother, 'Mom, the teacher asked us to do a little experiment and write a composition. But what kind of experiment should we do? "My mother asked me," do you have a nature book? "Yes, ah & hellip; & hellip; Oh, by the way, thank you, mom! 'I turned and ran into the room. I found the nature textbook and read it. Turn over, see a line of striking words: do experiment - conductor and insulator. that 's fine with me. So I was all eyes. Because there are explanations that the human body, the earth, metal and impure water are all conductors. It also explains that electricity flows through objects such as wires. This phenomenon is called conduction. Therefore, I worked hard to find copper, iron, aluminum, rubber, wood and plastic and other materials according to the requirements of the book, and sat down on the table to work conscientiously. Although the experiment was done well, I didn't know what a conductor was or what an insulator was. So I read the book carefully again and again. Finally, I learned that objects that are easy to conduct electricity are called conductors, while objects that do not conduct electricity are called insulators. And copper, iron, aluminum, divided into conductors, rubber, wood and plastic into insulators. But we should pay attention to: when there is a large electricity through the human body, it will cause injury or death. So we should pay attention to electricity.
After the experiment, I was very happy. Because of this experiment, I learned to do it by myself, and also learned that electricity is very dangerous. We should pay attention to the safe use of electricity. When we had a life class this afternoon, Mr. Li said mysteriously to us: "children, let's do a little experiment in this class, OK? "We all cheered up:" OK! That is great! '
Mr. Li first used scissors to cut a piece of white paper into many small pieces of paper and put them on the platform. Then he took a plastic ruler and kept rubbing it on his head. After rubbing for a while, he quickly pressed the ruler on the small piece of paper, and then gently lifted the ruler. Eh, the small pieces of paper have been sucked up to the ruler. It's amazing! We all asked curiously, "Mr. Li, why is a small piece of paper sucked onto the ruler? "Teacher Li said with a smile:" because the plastic ruler and hair friction generated static electricity, so it can absorb the lighter pieces of paper. 'Oh, so it is! When we had a life class this afternoon, Mr. Li said mysteriously to us: "children, let's do a little experiment in this class, OK? "We all cheered up:" OK! That is great! '
Mr. Li first used scissors to cut a piece of white paper into many small pieces of paper and put them on the platform. Then he took a plastic ruler and kept rubbing it on his head. After rubbing for a while, he quickly pressed the ruler on the small piece of paper, and then gently lifted the ruler. Eh, the small pieces of paper have been sucked up to the ruler. It's amazing! We all asked curiously, "Mr. Li, why is a small piece of paper sucked onto the ruler? "Teacher Li said with a smile:" because the plastic ruler and hair friction generated static electricity, so it can absorb the lighter pieces of paper. 'Oh, so it is! A failed small experiment, a failed small experiment
Today, Mr. Han is going to do a small experiment with us. What kind of experiment is it? Why is Mr. Han so mysterious?
Mr. Han took a cup and a piece of white paper from the platform. Everyone yelled, "I know, I know. Mr. Han wants to put the paper into the cup." Han said, "really?" Han put the paper on the top of the cup, and then asked, "if you turn this cup upside down, will the paper fall off?" Some students said, "it will fall." Some students said, "it won't fall." Han laughed and asked, "do you want to know the answer?" "Want to know," the students yelled in unison "To know the answer, we have to do a small experiment," Han said So we widened our eyes and looked at Mr. Han without blinking. I saw Mr. Han holding the paper with his hand, and then slowly poured the cup. As soon as he put the hand, the paper fell like a leaf. The students who had just guessed that they would fall out yelled: "Yeah!" "Oh!" sighed the students who could not guess.
At this time, Mr. Han filled the cup with a cup of water, put the cup on it again, and asked the students with a smile: "this time I turn the cup over, will the paper fall off?" "It won't fall, it won't fall." Mr. Han turned the cup upside down. As soon as he loosened his hand, the water spilled all over the platform, and the paper was soaked through. Maybe it was because the paper was too thin and used double layers. We all thought that the experiment would succeed, but it failed. We were very disappointed! I said, "this experiment is so meaningless." However, Mr. Han said to me earnestly: "when Edison invented the electric light, did not he also go through thousands of failures?"? We must experiment repeatedly and stand the test of failure! " composition
Although the experiment failed, he gave me a deep memory, and made me firmly believe that we will succeed, because failure is the mother of success! An interesting little experiment. An interesting little experiment
Grade 5 of four Village Joint School of Fengbo Central Primary School
Dong Bowen
In the weekly composition class, the teacher told us to do a very interesting experiment in the next class. Students are looking forward to the next composition class. composition
The day finally arrived. "Jingling, jingling" the bell rang again, and our eyes were fixed on the door. The teacher came in with a handbag in his hand. He took out a transparent glass, a bottle of mineral water, a bottle of detergent, a sewing needle, a pair of small tweezers and a dropper from the bag, and put them on the experimental table one by one.
It's time to do the experiment. The teacher first unscrewed the cap of the mineral water bottle and poured the water into the cup. After the water surface became stable, he carefully picked up the needle with tweezers and put it into the water gently. Ah, the needle didn't sink, but floated horizontally on the water. Then the teacher sucked the detergent with a dropper and dropped it into the water. In a blink of an eye, the needle quickly sank to the bottom of the water. Students, you look at me, I look at you. Why is that? composition
Or the teacher for us to solve the mystery: the original water surface tension, this tension to the needle to support. Pour in the detergent, and the detergent dissolves into the water, reducing the surface tension of the water, destroying the water surface film, and the needle will naturally sink into the bottom of the water.
Ah! How interesting. When I grow up in the future, I will go to explore these interesting phenomena myself.
(Instructor
Liu Jiedong) garlic Seedling Growth Experiment 1, the cause of the experiment: dad didn't know when he liked to eat garlic, so I decided to raise some garlic seedlings at home and record the growth of garlic seedlings. 2、 The process of the experiment: choose four cloves of garlic from the garlic bought by my mother, keep them in a big bowl, fix the garlic position with a few stones, and then pour water on it. Observe and record the growth of garlic seedlings: the next day, one clove of garlic began to extract roots, the third day, the fourth day, the other three cloves of garlic also pulled out roots. The garlic that first took out roots began to sprout on the fourth day, and on the sixth day, the new buds grew green leaves. The roots and buds of the other three cloves grew slowly, and the slowest clove sprouted on the 17th day. Looking up the data, we know that the nutrition of garlic seedling in the early stage of growth comes from the mother garlic petals, so it can grow normally in water and without soil. 3、 The results of the experiment: I moved four garlic seedlings into the flowerpot to continue to raise them. I prepared to wait for the garlic seedlings to grow slightly, and then to study the growth of plants under different conditions. Post: 325204 Chen Yi Ni, class 3, No.2 Experimental Primary School (Tangxia Town, Zhaozhai), Ruian City, Zhejiang Province
On Saturday afternoon, I stumbled upon a small scientific experiment.
First prepare two transparent glasses. Then, in the two glasses, one is filled with 10 / 8 of clear water, the other is filled with 10 / 5 of water and 10 / 3 of salt water. With chopsticks, mix the salt water well, and then put two eggs in the two glasses of water at the same time. At this time, I found that the eggs in the glass filled with water are sedentary, and the eggs in the cup filled with clear water are floating Why?
I checked it on the computer. It turns out that the density of salt water is higher than that of water. For example: ten catties of cotton is as heavy as ten catties of cotton, but if you put ten catties of cotton in the water, it is always floating, and ten catties of iron is just the opposite. Another example: there is a dead sea somewhere in the world. There is no living in the four seas. The content of this page is pushed by "Sihai net reading" for you, because the small fish can't sink on the four seas, it will die on the sea surface, and people can't sink on it It's fun! composition
This scientific experiment, let me return with full load! Please remember the website address