In science class, we have done many interesting experiments. Please choose one of them and write down the experiment. You can also write your own designed practice

Interesting little experiment

"Ding Ling Ling", as soon as the class bell rang, the teacher walked into the classroom with a happy face. "Classmates, have you brought all the eggshells?" "Yes!" we replied in unison. "But what can you do with eggshells?" "Can you make a roly-poly?" we whispered. "Today, we are going to do a small experiment with these two half eggshells. Before we do it, please guess. I will use this pencil to stab the eggshell vertically downward to see which half of the eggshell breaks first. "What?" "The one with the mouth facing down will break first!" Most of the boys pointed at the half of the eggshell. "The one with the mouth facing upward will be broken first!" my deskmate said decisively. Many girls were sitting, hesitant. "Okay! Let's do it now and see who has the correct answer."

The teacher asked a classmate to help. He pointed a pencil at the teacher's hand with his mouth facing up. The eggshell, when I put my hand down, the pencil fell on the eggshell, but the eggshell was not broken. The second time the pencil fell, it fell into the teacher's hand, then fell to the ground, and the pencil lead broke. The teacher took out another pencil, and this time she did it herself. Just two drops of the pencil, the eggshell with the mouth facing upward was broken. Then, the teacher took the pencil and stabbed the eggshell with the mouth facing down. "One, two, three..." We counted together, but this half of the eggshell seemed to be wearing armor, and it did not break even after being stabbed for more than ten times.

“Yeah! I guessed it right!” My deskmate danced with joy. "Okay! Let me ask the students to do it themselves to see if this is an accidental phenomenon." "Yes, don't get too proud first!" We are not convinced.

After we did this little experiment ourselves, we finally realized that it is easier to prick two and a half eggshells vertically with a pencil because the force on the eggshell facing downward is concentrated, so it is easier. Being punctured; the eggshell with the mouth facing down is dispersed, so it is not easy to be punctured. No wonder the workers at our school's construction site all wear helmets with their mouths facing downwards. It turns out they are all for the same reason!

Small experiments contain great truths. This class is really interesting!

An interesting experiment

Science has always been my favorite subject from the first grade to the fourth grade. I have done countless experiments in science class, but among these countless experiments, there is only one that remains fresh in my memory, and that is the coin experiment I just did not long ago. In the science class that afternoon, the teacher announced to us: "Today, I am going to do a very interesting experiment with everyone!" "Yeah!" As soon as the words fell, the students cheered. "Is it an experiment of throwing coins into water?" A classmate wondered. "That's right! Who among you has coins?" "Me! Me! I do!" The students all rushed to "hand in" their coins one after another. The experiment started, and the teacher put coins into the full water glass. I squeezed in front, opened my eyes wide, and stared at the water glass closely, for fear of missing any small link. "One, two, three..." Coins "jumped" into the water glass one after another, and the water level was also rising. The teacher suddenly stopped and asked: "Students, guess what will happen next?" "The water will overflow!" the students said in unison. "Wrong! Let's continue reading!" "Who still has coins?" The teacher "searched" for six more coins on the students and carefully put them into the water one by one. The last coin jumped with a "plop" After entering the water, like a well-trained diver, it rotated 360 degrees in the water before falling safely to the bottom of the cup. At this time, the students were surprised to find that the water surface exceeded the mouth of the cup, and it was half a centimeter! The classmates immediately surrounded the teacher and asked what the reason was, but the teacher gave it a try and asked us: "What do you think?" We were all monks who were two feet tall - scratching our heads. After repeated inquiries from the students, the teacher finally opened the "Golden Mouth" and said mysteriously: "This is the tension of the water surface. It is this invisible force that supports the water surface to exceed the mouth of the cup without overflowing." It turns out that it is. so! We finally understand why.

This experiment taught us that we cannot draw arbitrary conclusions about anything. Only by having the courage to explore and practice can we uncover the answer. There are still many secrets in nature. I believe that as long as we continue to explore, we can solve many mysteries.

An interesting experiment

You must have seen "volcanic eruption" on TV, but have you ever seen it with your own eyes? I have seen "volcanic eruption" once , but this is a simulation experiment of "volcanic eruption". I also did this experiment myself. Hey, "volcanic eruption" is really fun. You can also submit it.

I will bring it according to the experimental requirements. Get a glass, a bottle of vinegar, a bottle of detergent, a pack of baking soda, and a piece of newspaper. First, pour some baking soda into the cup, then pour some detergent, and then put the newspaper under the glass. /p>

The experiment was about to start. I poured some vinegar into the cup, and a miracle soon appeared. Just now, there were only some baking soda and detergent in the bottle. They were safe and sound. How could they pass by? How many seconds did it take for it to turn into bubbles? And it was just a little bubble, but now it keeps rising. After only ten seconds, it swarms up from the mouth of the glass, overflows from the bottle and flows onto the newspaper. At this time, I was excited and surprised, watching the floating bubbles intently, for fear of missing any details. After about 18 minutes, the bubbles gradually disappeared. Ha, this experiment is so fun and interesting. !

Why is this? I quickly grabbed the book and looked it up, but there was no mention of it. I had no choice but to think about it myself. Have you mentioned it before: Baking soda and vinegar will react chemically to produce a lot of foam, just like soda water will produce some foam when shaken. So what role does the detergent play? I rack my brains and can't figure it out. .

In order to understand the mystery, I repeated the experiment and found that the reason why the foam increased so much was because the detergent acted as a catalyst. Isn’t this similar to the principle of pumice formation? . This little experiment is really interesting.

Doing small scientific experiments allows me to understand scientific principles while playing, and it also exercises my hands-on and brain skills. It is really interesting.

An experiment

I have loved drawing since I was a child, and I was able to draw many things when I was five years old. Once, I drew a painting called "Summer Scenery" and I admired it. It was good and special. The frog on the lotus leaf was cut out of colored cardboard. I showed this painting to my father. After reading it, my father said: "I have only seen green frogs, but never pink or yellow frogs!" "I was very sad, pouting, tears rolling in my eyes, and almost crumbling. But my father smiled and said: "Don't cry, don't cry, dad will do a magic trick for you to make the frog take off his yellow clothes. ""May I? "I looked at my dad doubtfully.

My dad asked me to find a plate, paint, brush and hair dryer. Everything was ready. My dad then directed me to carefully pick off the paper frog and put it on the plate. , then my father took out a bottle of liquid from behind, which looked just like boiled water. I asked in confusion: "What's the use of this?" Same as water. Dad laughed: "Silly daughter, this is 84 disinfectant, not plain water for you to drink." And it is harmful to human skin, so be careful when using it. ""oh. "I nodded in understanding. Dad poured the 84 disinfectant he said into the plate. A miracle happened. In an instant, the pink frog turned white. I was stunned, and the frog took off the clothes that were difficult to take off. Really. Amazing! I used an eyebrow clip to pick up the paper frog and blow dry it with a hair dryer. “Although the frog has changed its appearance, it’s still not green? "Wouldn't it be enough to paint it green?" "So I used a brush to put green clothes on the frog. "Wow, the frog is more beautiful. Dad, teach me how to change quickly! "Actually, it was caused by the 84 disinfectant. The color on the frog is acidic, and the 84 disinfectant is alkaline, so the color on the frog is gone." ”

Oh, science is so wonderful and profound.

Remember an interesting little experiment

I am a little boy who loves to explore new things. In the past, I heard that after cutting an earthworm into two pieces, not only will it not die, but it can also become two living earthworms! To prove this, I conducted an interesting little experiment.

My classmates all said that earthworms can be found everywhere after a rain. One day after a shower, I found an earthworm by the flower bed without any difficulty.

After I got home on Friday, I took out my utility knife, put the earthworms on a piece of paper, and thought confidently: I will be able to successfully complete the experiment.

The experiment began. I carefully cut the earthworm in half and took a closer look. Huh? Why did the earthworm seem dead and motionless? I was extremely discouraged: Did my experiment fail? Just when I was dejected, I suddenly remembered what my mother once said to me: "Don't give up when you encounter difficulties. Mom believes you can do it!" So, I cheered up and continued to experiment. I took "One Hundred Thousand Whys" and started looking up some information about earthworms. After flipping through it, I found the answer. oh! It turns out that after the earthworm is cut off, the muscles next to the wound will immediately tighten, just like the door that was still open immediately closes. It's really magical! Earthworms actually have a strong regeneration ability. I see! After two or three days, the divided earthworms can become two complete earthworms! Seeing this, I seemed to see the dawn of victory and felt confident again!

Two days later, when I went to see my earthworms again, I really found two small earthworms crawling around in the box! I told my mother about this, and she smiled and said, "Haha, our son can also study and do his own experiments!"

This is a small experiment I did before, it's very interesting!

No tumbler and center of gravity

Dear classmates, have you heard of the story of Columbus erecting eggs? Columbus had to break the egg to stand it up. In fact, it can stand up without breaking it, but it takes about five minutes, which is really troublesome. Because the center of gravity is directly above the triangle, the egg can stand upright. When the center of gravity is not above the triangle, the egg falls over. The so-called center of gravity refers to the point where the resultant force of gravity on each part of an object acts. From this, we can think of an object that can not only stand up, but also cannot be pushed down no matter how hard it is pushed. Needless to say, if you are smart, you will definitely think that it is a tumbler. An interesting tumbler, no matter how hard you push it, it will not fall over. Even if you put it sideways, it will stand in front of you stubbornly. Why won't the tumbler fall down?

Oh! On the one hand, it is because it is light on top and heavy on the bottom, and there is a heavier iron block at the bottom, so the center of gravity is very low; on the other hand, the lower part of the tumbler is made into a slippery ball shape. When it is forced to one side When tilted, its center of gravity is raised, leaving it in an unstable state. Under the influence of gravity, it moves toward a stable equilibrium state. Due to natural inertia, it will swing back and forth several times before finally staying in its original position.

Ah! It turns out that science is everywhere around us. We must do more scientific experiments, learn more scientific knowledge, and study hard to benefit mankind.

Why don’t soybeans sprout?

Last week, I did a novel experiment - hatching bean sprouts.

Grandma gave me some soybean seeds, but I thought there were too few, so I had to take them from the plastic bag my mother tied tightly. My mother said that the beans in the bag could not hatch bean sprouts, but I didn’t believe it, so I still wanted them. Do experiments. So, I separated the two types of soybeans and hatched them.

According to the introduction in the book and the teacher's guidance, I put the two types of swollen soybeans into the middle of two layers of wet straw, and sprinkled them with water every morning, noon and night. I thought, how could the same bean sprouts not grow with the same hatching method?

The next day, I gently opened the straw on the bean sprouts. Grandma’s soybean seeds had swelled to twice their original size, and many bean sprouts had short and thick waists. bud.

But my mother’s soybeans only gain weight but don’t sprout. What’s going on?

On the fourth day, grandma’s bean sprouts grew much taller, but my mother’s soybeans changed color, from light yellow to dark yellow, and a few turned to light black. It seems that my mother is really "unfortunately right".

On the fifth and sixth days, time passed day by day. The bean sprouts hatched from grandma’s soybeans grew taller and tenderer, with jade pillars and golden domes, so beautiful! But my mother's soybeans were rotten. Only then did I believe that what my mother said was true, but why? I had no choice but to ask my mother for advice, and she said with a smile: "Although the bean seeds are dried, they still need to breathe. Your grandma's bean seeds are hung under the eaves, and the air is fresh, so breathing is certainly not a problem. And the ones in the plastic bag Soybeans, because the bag mouth is tightly tied and there is no ventilation, they can't breathe and have long since suffocated to death." I said thoughtfully.

I never thought that dried soybeans would suffocate to death. There is science everywhere in life!

"I'm so happy today. I finished my homework in half an hour. It's great!

" I said to myself. What to do with the rest of the time?

I should go see the little goldfish my mother bought. I walked quickly to the oblate fish tank. The fish seemed to welcome me and swam towards me one by one. Among them, the lion-headed goldfish raised its big head and swung its red and white tail, as if to show off its beauty. I suddenly thought: Why do fish control balance in the water?

I observed that the fish kept swaying when swimming. Are the fins and tail at work? In order to verify my conjecture, I conducted a bold experiment. I first prepared small scissors, fishnets, and gauze. Then I used a fishing net to fish out a small grass carp that was feeding the turtle. The fish seemed to be aware of the danger - it struggled desperately. I silently said to the small fish: "Little fish, don't be afraid. In order for the experiment to succeed, you have to do it." Give it a try!

" I stuck the double-sided tape on my thumb and index finger and stuck the little fish on. I carefully picked up the scissors and cut the little fish off one by one. After cutting off the fins, I gently put the bald fish into the fish tank. At first, the little fish struggled for a while and then sank to the bottom. After a while, it also No more swimming. It seems that my guess is correct.

I was still a little worried, so I checked the encyclopedia, and it really said: The fins of fish are used to allow fish to control balance. The fish's tail controls direction. Through this experiment, I felt how interesting it is to gain knowledge through observation and experiment!

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I like insects, and I go outside to observe them whenever I have time. Today, I did all my homework. Just when I was thinking of going outside to observe insects, the dark night began to fall, and God also began to "shed tears"!

I looked at the sky and couldn't help but sigh, thinking: The weather was fine just now. It will stop raining sooner or later. It will start raining as soon as I go out. When I was worried, my mother asked me to drink wolfberry tea. As soon as I saw the wolfberry tea, I immediately became interested in it. Because I saw a lot of wolfberries floating on the top of the teacup and a few wolfberry berries at the bottom of the teacup, I felt very strange. Why do some wolfberries float on the water and some sink to the bottom of the tea cup? I thought about it carefully: Maybe it's because wolfberry is like a ball, and it can float on water if there is air inside.

I started doing small experiments. First, I took out two wolfberry seeds floating on the water, put one of them in the water, and flattened it with a pair of chopsticks. As expected, the wolfberry bubbles popped up in the water. . Then I took off the chopsticks and observed whether the wolfberry would sink. I saw that the wolfberry slowly sank. Then I pushed another wolfberry to the bottom of the tea cup with chopsticks, then took off the chopsticks. This wolfberry slowly floated up, and finally floated to the surface of the water. Alas, I finally figured it out. Turns out my guess was right. Because the air inside the first wolfberry came out, it sank.

There was still air in the second wolfberry, so it floated up.

Through this small experiment, I learned a truth: wolfberry is like a ball. If there is air inside, it will float on the water, but if there is no air, it will sink.

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I would like to know if adding more water or less can make the mung beans cook faster. Point it into mung bean sprouts. A few days ago, I did an experiment to test it. I first took two plastic boxes, then paper towels and water, and two mung bean seeds. I first put paper towels in the two boxes, then put 50 drops of water in one box and 50 drops of water in the other box. Put 80 drops of water, then I put two mung bean seeds in two boxes respectively, and wrote the numbers. The one with more water is No. 1, and the one with less water is No. 2. Finally, I put the box on the balcony facing south. . After doing all this, I feel very happy and I will know the result soon. I also guessed that the mung beans in the group with more water would germinate faster. I stood quietly on the balcony waiting patiently for this moment to arrive. I waited for about 2 hours and found that the seeds in box No. 1 were much larger, while the seeds in box No. 2 had almost no change. I waited another 3 hours or so and found that the seed skin in box No. 1 was broken, while the seeds in box No. 2 had only grown much larger. I was secretly happy and continued to wait for the moment when the seeds sprouted. About another 3 hours later, I looked again and found that Bean No. 1 had stretched out a leg, while Bean No. 2 only had its skin broken. I thought: It will take a while to know the result! I waited for 2 hours, and I saw the seeds in the box with more water sprouting. I made the seeds sprout faster. I shouted happily: "I guessed it right, I succeeded!" Yeah! This mung bean germination experiment has benefited me a lot!

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One day, the teacher asked us to guess Are ants afraid of mothballs? I guess ants are afraid of moth balls; some students also guessed that ants are not afraid of moth balls, but no one can tell the secret. So, everyone ran to the playground together with curiosity and started this experiment.

We saw little ants crawling on the ground in a hurry, looking for food. Maybe the ants were starving! Taking this opportunity, we quickly intercepted an ant and lightly scratched its path with mothballs. Everyone shouted: "Go, go!" Although I also shouted, but I That's not what I thought in my heart, but what I thought: I definitely won't rush through, and the ants will either take a detour or turn around and go again. I stared at the little ant nervously. At this moment, the ant bypassed the "obstacle" and continued moving forward. "Ah, ah, my guess was right!" I was a little happy at this time. Seeing that the ant was about to disappear, we hurried forward and drew a second and third line of defense, but it successfully bypassed this 'trap', and we couldn't help but say "Wow".

We didn’t believe it, so we drew another circle around the ants, and it was thicker than before. At this time, I thought again: Hee hee, you naughty boy, let’s see where you go. I saw the ants in the circle like headless flies. After a while, it seemed to have a "special trick", wandering in the circle, as if saying: "I don't believe I can't pass the test, I must succeed!" Sure enough, it rushed over again and looked back. We seem to be saying: "Young man, you still want to trap me, you are still a little immature!" Just like this, we stroke a few times and he rushes a few times. We were happy that our experiment had results, and while we were happy, I was also a little curious.

What's going on? I came to the computer with this question. I checked it out, oh! It turns out that the ant relies on smell to find its way, and the mothballs will affect its judgment, so it will take a detour. How did it get out later? Because if you are trapped inside and wait for a long time, the smell of the mothballs will fade and the ants will rush out of the defense line. Seeing this, I thought to myself: I finally revealed the secret.

Through this experiment, I not only learned another piece of knowledge, but also understood a truth: no matter what you do, don’t make random guesses, you should practice it yourself, so that you will remember it more deeply and get the correct answer. understanding.

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On a sunny day On the morning of the morning, the teacher walked into the classroom with a smile and said with a smile: "Today, I want everyone to relax and let's play interesting games!" After listening to the teacher's words, the students' benches seemed to have nails growing out of them. Can't sit still.

We are playing "cat and mouse". The teacher picked a few students to be "cats" and a few students to be "rats." Then he told the rules of the game: "cats" are not allowed to enter the "mouse hole." The teacher asked me to be the "master" of the family, and the rest of the students gathered in a big circle. The teacher asked us to think of weeds as "rats" who wanted to eat their own "food."

The game officially started. The owner said to the cat: "I will sell vegetables first. You are here to look after the house. Don't let mice steal food." The cat nodded, and after the owner left, the cat began to treat Realize its action plan: pretend to sleep, confuse the "mouse", try to lure the mouse out of the hole, and then eat it.

After a while, the mouse finally lost his temper, became restless, and wanted to steal something. It exposed its little head first, looking east and west to see if there were any targets or prey. Suddenly, the mouse was surprised to find that there was a pile of delicious food in front of a sleeping cat. It couldn't believe its eyes, and its "saliva flowed three thousand feet." It walked carefully to the "food" and thought: So lucky today! The food is found and the cat is sleeping. God is really helping me! I saw it let go of its courage and approached the food with dignity. Just when it was secretly proud and ready to use its "hands" to get the "food", the cat suddenly opened its eyes and caught the mouse in one fell swoop. The mouse was in the cat's hand. He struggled desperately and shouted with a sad face: "Grandpa Cat, please forgive me this time! I will definitely repay you well." But the cat is the natural enemy of the mouse and will not sympathize with it at all. In the end, the mouse became The cat enjoyed the meal on the plate. The students held hands and jumped up and down, very happy.

"Ding Lingling, Ding Lingling..." A rapid bell rang, and the students reluctantly returned to the classroom.

Ah! The game of "cat and mouse" is really interesting. I really want to play this game every day. Our campus life is so colorful...

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Interesting Experiment

In the book "Ideology and Morality", there is an interesting experiment - "Egg Crash" Earth". When I saw this topic, I immediately became interested and wanted to do this experiment.

This experiment is like this: take a raw egg and wrap it with materials. There is no limit to the materials for making it. Then throw it from the third floor so that it doesn't break. I got ready with enthusiasm, but I didn't expect that the first level would stump me - the packaging method. What packaging should be used? I racked my brains and consulted the methods of other students, and finally decided on a method: build a triangular frame and put the eggs in it. I think the triangular frame has more corners so that the corners can touch the ground, thereby reducing vibration and preventing the eggs from breaking. To be safe, I wrapped the eggs in two layers of handkerchief and one layer of sponge. Then use wooden sticks to make a triangular frame and put the wrapped eggs in it. Fasten the frame tightly again. I was still worried, so I took another big plastic bag to act as a parachute, put some thread on it, and tied it to the frame. I read it over and over again with great joy, and felt that it was not very good, so I wrapped some napkins around the three corners of the floor, and it was done.

In the evening, my classmates and I excitedly took the packaged eggs and prepared for the experiment. He stood downstairs, and I climbed up the walkway between the third and fourth floors, carefully closing the windows downstairs as I went upstairs to avoid parachutes hanging on the windows. When everything was ready, I shouted downstairs: "Are you ready?" He replied, "Okay." I opened the plastic bag and threw it away. Then I immediately ran downstairs, and in the corridor I heard him shouting happily: "It's like a parachute!"

As soon as I got downstairs, I looked to see if the egg was broken, and the big end of the egg was broken, but I was still very happy. Happy.

On the way home, we met our math teacher, Teacher Jiang, who asked us the results of the experiment with great interest. We quickly asked Teacher Jiang for advice. Teacher Jiang said with a smile: "There are not enough angles in a triangle. If there are more, the three corners touching the ground should be facing outwards." Stretch it more so it can absorb shock."

I gained a lot of knowledge from this little experiment. Doing experiments is both fun and informative. In the future, we must observe more and explore more, and be a thoughtful person in life!