A bag of toothpicks and a bag of diced carrots can make a "tower". Do not believe, our school will hold such an activity!
The day of the activity has finally arrived. I took the materials prepared by my mother to school. In the afternoon, my classmates and I couldn't wait to come to the activity site. Under the teacher's arrangement and guidance, we did our homework in groups of three. With the crisp cry of "start", the radish tower-building competition on the spot began. I was so excited that I didn't build the tower for a long time, but I saw that some students had already built the bottom of the tower. My hands are getting tense. When I get nervous, my hand is pricked by a toothpick, and blood beads come out. It really hurts! Can think of it, persistence is victory, I shook my head and gnashed my teeth.
Later, under the guidance of the teacher, we finally laid the foundation. Then, the students really racked their brains. In order to make toothpicks and radishes grow tall and steady, they came up with strange construction methods. Some of them set up creative models, others refer to skyscrapers and minarets, and each group of students has their own ingenious ways to build them firmly.
Time passed little by little, and the students set up the tower with great concentration. Just at the moment when we saw hope, when the tower was halfway up, the result of the game was finally announced. Wang Wenxuan and Pu Yunxiang and their team competed for the first place, and then the second and third place came into being. We little hands hold hands to encourage ourselves. Don't be discouraged, and strive for the first place next time.
We are all immersed in joy, and this radish tower activity competition is over. Whether it is successful or not, the purpose is to make every student feel the charm of science and technology, learn through experience, improve through communication and grow through participation.
According to my mother, a long time ago, there were no lights, telephones, cars and washing machines in the world ... I think people at that time should be so tired, bored and inconvenient! Thanks to scientists, their inventions make our world so beautiful. Therefore, I also want to be a scientist and invent more useful things for people.
Nowadays, because of environmental pollution and people's life pressure, diseases are getting younger and younger, and many people get incurable diseases at a young age and die young. White-haired people send black-haired people, which is the sadness and pain of many parents. In addition, there are so many infectious diseases, such as SARS, hand-foot-mouth disease, type A H 1N 1 and so on. This makes many people "talk about illness and change color." If I were a scientist, I would invent a medicine, which will make people recover immediately after taking it, just as good as a cold and fever now. Besides, this medicine is very cheap and everyone can afford it.
Our parents often worry about our clothes. When the seasons change and we grow taller, we have to buy new clothes. The water is so cold in winter, but we often get dirty for fun, which makes our parents wash our clothes and our hands freeze like carrots. If I were a scientist, I would invent such a kind of clothes: it will change color and thickness with the change of seasons, and even change a style once a week, so that you won't get tired of wearing it. More importantly, it will never be dirty, lest our parents wash our clothes again.
If I were a scientist, I would invent many things that are beneficial to mankind. Of course, being a scientist is not that easy. So I will study hard and strive to realize my ideal as soon as possible.
Today, I am both happy and excited. Because I'm going to visit Ningbo Science and Technology Museum. This trip was organized by American creative organization, and I was assigned to the third group led by teacher Yu. We set off early in the morning. It took about 2 hours by car this time. Although I am a little carsick, I am very excited to beat carsick and walk all the way to Ningbo.
When we got there, the first thing we saw was a big square house. On the first floor, the teacher asked us to line up, said some precautions, and then showed us around. But the teacher just showed us a general idea and didn't even have time to stop and play those projects. Some students quarreled, and the teacher said unhurriedly that we should visit first in the morning and come back to play in the afternoon. Let's have lunch first. Hearing this sentence, everyone quieted down.
Go back to the science and technology museum after lunch, and the afternoon is free time. Everyone went to find their favorite projects to play. First, I went to this place in the universe, and first I played the Mars exploration ship. I turned on the switch, and a picture of Mars came out, white sphere and red land. We can also move the spacecraft and observe other places. Although it is some fake pictures, it is true. I came to the land of marbles again. The beads here have to bounce into a big hole, and the force must be controlled before they can bounce in. The first time, I pushed too hard, and the beads rolled, turned around the hole and flew out. The second time, I bounced with medium intensity and got into the beads. ......
I lost the fun of science again. I imitate earthquakes. I let us enter a house first. This house is different from ordinary houses. It will move. When the worker presses the button, the ground will start. There is a place where shark skin can be used as a bathing suit and a hornet's nest can be used as a wheel ... At four o'clock in the afternoon, I reluctantly left the Ningbo Science Exploration Center.
This visit is a short scientific trip. I not only learned a lot of scientific knowledge, but also stimulated a strong desire for scientific exploration.
The fourth article of the fourth grade scientific composition "Teacher, teacher, my desk lamp is on" and "My sweeping robot has finally started sweeping the floor". Waves of cheerful laughter echoed in the classroom, and every classmate's face was filled with the joy of success.
On the first day of winter vacation, I took part in the little Newton's scientific practice class organized by Cuiyuan Street, and went into the scientific world to observe scientific miracles and understand scientific principles. This course lasted five days. We studied science knowledge such as electricity, magnetism and lever principle, and made small desk lamps, magnetic levitation pens, boats, shooting machines and sweeping robots. Among them, my favorite is the sweeping robot.
Mr. Hu is the science teacher in our class. He is a handsome young man. In class, while playing PPT video, he tells the scientific principle and production method in simple and easy-to-understand language. The picture changes in odd seconds, which deeply attracts our attention. After talking about the principle, the teacher gave each student a set of equipment boxes. I can't wait to open it. There are electromagnetic boxes, brushes, motors, springs and other materials inside.
According to the teacher's production steps, I first connected the motor and the electromagnetic box with a black line and a red line, and then fixed the motor on the big brush with screws. Then a broom similar to a writing brush is installed at the back end of the robot, and a spring eye is installed at the front end of the robot. Finally, two batteries were installed, and a lifelike sweeping robot was successfully made.
Flip the switch and the sweeping robot will start working at once. I saw its two round eyes wide open, blinking around the ground, looking for garbage everywhere, sweeping wherever it was dirty, and automatically changing direction when encountering obstacles. Watching it turn around and keep busy, I can't help but think of the hard sanitation workers. I think in the near future, sweeping robots can help them clean and lighten their work.
I feel very happy during these five days of study. I not only learned the scientific knowledge of series circuit, magnetic levitation and lever principle, but also made so many scientific small productions in the exploration and research. It's really meaningful.
There is a book that I can't put down recently. I can't get tired of reading it over and over again. This book is a science volume (weather and climate).
Science volume (Weather and Climate) is one of the series of science volumes, which tells us about meteorology by combining cartoons and words. Starting with what meteorology is, this paper describes what disciplines meteorology studies, the relationship between human beings and meteorology, and the difference between climatology and astronomy. Then I talked about what is the Mediterranean climate, what is the subtropical climate and so on. Then talk about how various climate phenomena are formed, such as the "El Nino" phenomenon that people often say, how beautiful snowflakes are formed, how rainbows are formed, and what is the "heat island effect"? Then tell us where there is extreme climate in the world and how we humans can prevent climate diseases.
A boring knowledge, explained with vivid stories. The protagonists of the story are all familiar cartoon characters, such as jumping frog, fire hat, red kangaroo, white radish and so on. Vividly displayed various climate stories. For example, can you measure the weather by observing clouds? In this chapter, it is said that jumping frog jumps east and west and stains beautiful clothes. He hopes to get dressed and get ready to dry. When hanging clothes, sunflower said, you'd better hang them indoors, because it's going to rain! Jumping frog doesn't listen, but still enjoys the clouds in the sky. I smiled happily when I saw Yunxiang Wan and two puppies grabbing things. I don't know, it rained naively a few minutes later. Oh, dear! I got my favorite clothes wet. Now, I want to ask how the sunflower knows. Sunflower told him mischievously: There are many kinds of clouds: cumulonimbus, cirrocumulus, hook cirrus. Different clouds are formed due to different accumulated water in the clouds. I just saw the cirrus cloud thickening, which means that water accumulation is a sign of rain! If there are few cirrus clouds, the next weather may not change much! There are many such interesting stories.
Another feeling of reading this book is that you must pretend to understand and listen to suggestions. In the end, I still suffer. Because several cartoon characters in the book don't understand, they give different suggestions, either their things are broken, their bodies are harmed by the climate, and Dai sisters suffer. Haha, besides being happy, I also received the education of thinking and dealing with people.
This is really a rare good book! Comprehensive, rich, but not boring, very beautiful and durable. Learning more knowledge is a happy thing in life; Understanding scientific knowledge is an important thing in life!
Reading and reading, I seem to be in the scene and environment of all the characters in the book, and my mood fluctuates with their conversation. When I saw the losses caused by those bad weather, I couldn't help feeling nervous and worried. When I knew why such a climate was formed, I couldn't help but suddenly realize that I thought I had encountered such weather the day before, so that's it! There is no need to make a fuss about this situation in the future! This book left me a lot of room for knowledge and imagination. Swimming in the ocean of meteorological knowledge while reading a book. Rich knowledge makes me look like a hungry man looking for bread. When I saw new knowledge, I forgot about hunger. A lot of knowledge is accompanied by interesting pictures, which makes me laugh while increasing my knowledge. I am happy, and there is no pain that I don't understand.
With the development of science, the means of transportation are more and more advanced and developed, but have you ever thought about personal fatal trap-traffic safety? Now people's sense of security is getting less and less, and there are more and more traffic accidents. When we witnessed the disappearance of these fresh lives and the heavy damage to these healthy bodies, we sincerely lamented that the car accident was so ruthless, and the most precious thing in the world was life. Behind this series of deaths, behind this series of traffic accidents, how many families have lost their loved ones, how many joys have turned into tragedies, and how many happiness have vanished. Behind a traffic accident, the family lost its pillar, white-haired people sent black-haired people, and relatives were separated by yin and yang.
The disaster of the front car, the teacher of the rear car, red blood reminds people to cherish life, refuse to break the law and pay attention to life. A good life begins with safety. Only by ensuring health and life can we create a bright future.
If you don't want to be a disaster in front of the car, you must develop good traffic habits and have the following safety qualities: First, establish the will of traffic safety and don't do anything illegal. Second, master traffic safety knowledge and understand traffic safety. Third, master the traffic safety rules. Fourthly, we should cultivate traffic safety awareness and form the habit of obeying the rules with or without the police.
Life is alive, only life is the most precious. Cherish life, avoid traffic accidents and be a law-abiding boy.
Everyone has his own wishes. Some people want to be firemen. Some people are quite doctors; Some people are quite writers; Some people are quite soldiers; So what do you want to do? I don't know, okay? I'll say my wish first! I want to be a scientist!
If I were a scientist, I would invent a happy pen to make you happy at any time. Speak out if you are in trouble. There is no trouble at all. It will bring you good luck! In this way, everyone will not have troubles, and there will not be so many bad people. Our children can play wherever they want, and adults won't say,' There are bad people outside, so we can't go out, huh? "Do you understand?"'
If I were a scientist, I would invent a robot. It has many skills. It can cook, cook, mop the floor, and do housework ..... It can get quick results, so that parents can reduce their burden and play with their children more. In this way, children's childhood will be more fun and happier! Don't worry about nobody cooking or cooking. Instead of playing with children.
Scientists should have rich knowledge, so I should study hard, grow up to be a scientist and fulfill my wish.
This Saturday night, I sat on the sofa and watched a documentary about the earthquake. Dad came back with a heavy-looking box in his hand. I asked my father curiously, "What's in this box?" My father said to me, "This is an earthquake simulator. We can use it to understand how the house collapsed in the earthquake and how to keep it from collapsing."
He sat on the sofa and suddenly asked me, "Yo-yo, can you build iron bars with magnets in these boxes into a house structure, so that they won't collapse in a magnitude 4 earthquake after being electrified?" I thought: What's so hard about this? It's just a simple earthquake of magnitude 4, and it won't collapse if you hold it casually. Without thinking about it, I put the shape of the house on a small platform connected to the power supply, then turned on the power supply and adjusted the vibration level to the normal mode of level 4. But the situation of the experiment was bigger than I expected, and the previous times completely collapsed. I wondered, thinking, how did this happen? Isn't this the structure of all houses? . I became cautious again and carefully built a more accurate model, but the result was exactly the same as the first time, and it collapsed again without a few shocks. My mood is like a deflated balloon, and my high mood immediately shrank back and kept saying to myself, what's the matter? Can't go wrong! In desperation, I can only ask my father for help. My father took down the eight iron bars I put on the roof one by one, put them into big forks in the following four aspects, and said to me, "Now let's have a look. Will it collapse? " When I first started doing the program, I didn't expect this model to be as reassuring and unmoved as before. After the earthquake, my father's model still stands on the platform. I was surprised and quickly asked my father: Dad, why did you put it like this, so that the structure built by these iron bars would not collapse? "Dad told me that the reason for this is that it can disperse gravity and prevent gravity from concentrating on a certain point. If gravity is concentrated at a certain point, it will cause pressure when it collapses, so the casualties will be even greater. "
I didn't expect such a small change, but it caused a huge change in the result. What a wonderful scientific world! Let's continue to explore together!
One day in the summer vacation, I finished my homework and accidentally found that after wiping my head with a plastic ruler, I used it to touch the shredded pieces of paper on the table. As soon as the children saw their mother, the little pieces of paper jumped into her arms. Like iron filings attracted by magnets, they stick firmly to the ruler. I tried to pull the paper with my hand, but as soon as I pulled it off, it stuck again. After a few minutes, the little piece of paper and ruler are still reluctant to go. Seeing this, I was curious and did it again and again involuntarily. At this time, my mother saw that I was serious and smiled and said, "Little fool, that's friction electricity." "I only know hydropower and wind power generation at ordinary times. How can friction generate electricity? " I asked my mother in confusion. Mother said, "I'm very busy. There are so many books in the bookcase. I should learn to look up the information myself. "
In order to find out the reason of friction electrification, I went to the study and looked for a long answer from one book after another. Finally, I found the answer from the book "100,000 Why". It turns out that all objects have positive and negative electricity inside, and these two kinds of electricity attract each other. When an object rubs, the negative charge moves in the object, and when it touches another object, it will be attracted by the positive charge in the other object. After rubbing the hair, the plastic ruler absorbed a small piece of paper, indicating that the plastic ruler has electricity. Oh, I finally understand the truth.
Reading has made me understand the mystery of science, and I am determined to make friends with science.
Well, one day, I saw my mother ironing clothes with an electric iron. At first, I wasn't surprised, because my mother ironed clothes with it for the first time. But gradually, a big question mark came to my mind: how can this electric iron iron iron a wrinkled dress?
And then what? In the past, I would ask my parents, but this time, I decided to find out the truth of science by myself.
I found a crumpled cloth and a water cup first. Then I pressed the cloth with a water cup, which was uneven after a long time. Later, I weighed something on the cup. After a while, I looked at the cloth again, but there was still no improvement. I filled the cup with boiling water and pressed it on the cloth. After a while, the cloth looks much smoother. Experiments show that clothes will flatten when heated by an electric iron.
Later, I consulted the encyclopedia and learned that after the electric iron heated the clothes, the fiber material was deformed and expanded, but the expansion was limited because the electric iron was pressed on it. When the iron is removed, the fiber material of the clothes is suddenly fixed by the action of cold air.
Unexpectedly, there are so many scientific truths in daily life. Therefore, we should love science, study science and apply science from an early age. When I grow up, I will further explore the vast and wonderful scientific world and make contributions to mankind.
10 June 1 day, my mother bought me a set of parts for a model airplane, and I jumped three feet high with joy, not to mention the joy. In the afternoon, I invited two students, Xue Cheng and Wang Haoyang, to help me assemble the model.
When the work is ready, I assign them tasks and start action. I glued the deck with universal glue first, and then installed the cab. At this point, Xuecheng has completed the five-star red flag. Then I glued it on and started to make the hull. I put the bottom of the boat together with two bottom plates, and then put two side plates on it. Hmm! The basic shape of the ship is ready. Then, I fixed the hull with screws. At this time, the screw seems to be playing hide-and-seek with us, but it can't be found. Suddenly, I thought there were screws at home, so I rummaged through the boxes and found them. In the end, only those tiny parts need to be installed, which is a big problem. I was just about to give up. Wang Haoyang told me. Didn't your mother tell you? Don't give up halfway, or you can't do anything well. Come on, I'll show you how to do it. After Wang Haoyang's guidance, I realized that it was a piece of cake for Zhang Fei to eat bean sprouts. Three times five divided by two is done. Take a closer look, ha! What a style! In order to be more realistic, we installed several small windows in the cockpit and made an observation room! We cheered and put the boat into the water to see its heroic posture on the water, but unexpectedly, the boat did not move, as if it were against us. At this time, Xue Cheng shouted: Ah! I forgot to make the motor! Sorry, hee hee! Wang Haoyang and I both stared at him, then put the copper core and iron sheet in Madanes, and then fixed the motor with screws and installed it on the ship. Then, install cannons and planes. Ha! A model aircraft carrier was born. We put it in the water and saw it swimming happily.
Suddenly, I seem to be a captain, standing on a ship I built and swimming in the ocean of scientific knowledge.