Fourth grade my invention essay 400 words 5 pieces

1. A 400-word essay on my invention for the fourth grade

Time flies, the sun and the moon fly by, and we are here in 2030 in a blink of an eye. I've become a Ph.D., invented a lot of things, and now I'm going to invent a magical desk.

This kind of desk looks similar to an ordinary single-person desk. Although it looks like it is made of wood, it is actually made of a new type of carbon nanotube material.

It is 50 cm long, 30 cm wide and 50 cm high. There is a big drawer in the middle of the table, which can hold many books!

Are you particularly curious to know what functions this magical desk has? Let me introduce it to you.

There is a bulge on the upper left side of the table, with a delicate little cover on it. As long as you open the small cover, a mini tablet will slowly rise inside, and you can search for information on it. , read e-books; but you should not use it during the exam, because once you touch it with your hand during the exam, it will beep!

There is a nano-scale camera directly in front of the table. If you do something you shouldn't do in class, it will automatically take a picture and send it directly to the teacher.

There is also a robot hand under the table. Once your eraser or other things fall to the ground, it will automatically pick it up for you. Isn’t it very convenient?

I really hope that I can grow up quickly and develop this novel desk as soon as possible so that it can become a god-level assistant for students and also relieve teachers who work hard every day. A little pressure.

2. A 400-word essay on my invention for the fourth grade

Human progress is inseparable from science. I love science, so I made a small invention, which is simple and uses a lot of science. Knowledge.

I remember it was summer vacation, and the teacher assigned us a small science invention. What should I do? I thought about it, ah! Now that I have it, let’s make a plastic bottle yacht.

In this way, I picked up an old plastic bottle at home and started tinkering with it carefully. Cut off a small piece of the top, use two lenses to make a mirror using reflection, tie a rubber band on the bottle cap, tie two wooden sticks on both sides, and use cardboard to make a little decoration. Brighter and more prominent. It's easy to say, but it's not that easy to do. When cutting bottles, some of the ends will always be cut out. I use the periscope to connect to the bottle, so I can see the situation of the yacht in the water in time, and turn the wooden sticks on both sides to both sides. When turned, thrust is generated to move the yacht forward. It is said to be a plastic bottle yacht, but it is actually made of plastic bottles, popsicle sticks and cards. It is very simple and convenient.

Although my little invention looks simple, in fact, it contains a lot of scientific knowledge. When making the mirror, the knowledge of light reflection was used; to turn the wooden stick to generate thrust so that the yacht can rotate accordingly, the knowledge of mechanics was used here. In terms of embellishment, I also used my brain and cultivated my sense of beauty.

An ordinary little invention made me feel the joy brought by science. I am willing to keep flying in the field of science, flying higher and higher.

3. A 400-word essay on my invention for the fourth grade

On a midsummer noon, the sun hung scorchingly in the sky, and the weather was as hot as a steamer. We endured the heat and went out to buy some big, round watermelons. When I got home, I took a knife, cut the watermelon, then picked up a spoon and ate it hungrily. After a while, half of the watermelon was eaten. At this time, the watermelon rind took on a crescent shape. I thought: It would be a pity to throw it away; if I didn’t throw it away, it would stink if I kept it. What should I do? I thought about it, but I still couldn't think of a good way.

Two days later, I saw a sailboat sailing on the sea on TV.

I suddenly had an idea: treat the watermelon rind as a cabin, and then use cardboard to cut out some "machine" parts, wouldn't it become a "sailing boat"? I was so happy that I took out the watermelon rind from the day before yesterday and found a piece of it. Use a small wooden stick, then take out scissors to cut out the sail of the sailboat, stick it with double-sided tape, and a "sailing boat" is made!

However, the sailboat must float on the water. So, I took a basin of water, and then gently put the "sailboat" into the water. I couldn't believe that the "sailing boat" not only did not sink, but floated on the water! In this way, my invention was successful!

Through this invention, I also understood a truth, that is: to have A pair of observant eyes and a thinking brain. I hope I can become an inventor in the future and invent more practical things.

4. A 400-word essay on my invention for the fourth grade

Twenty years later, I am an inventor and I invented a potion.

This potion is a potion that can improve people's IQ and discover brain cells. It has a dark green surface and only a hint of bitterness. This is because a small amount of 'bitter factor' is added to it. Why is it added? What about the suffering factor? This is because my research found that a person has 80% of brain cells, but less than 12% of the cells have been developed into our thinking, which is the so-called IQ, which is Scientific elites like Einstein could only develop no more than 15% of their cells.

However, I thought: What if a kind of cellular water was invented to help the brain develop cells? This is the bitter factor.

The bitter factor plus various other potions are the wisdom-enhancing potions. Because it took me 101 times to successfully experiment, it is also called "Potion No. 102".

I first used myself as a guinea pig for the experiment. When I drank it, I was surprised to find that not only did my IQ improve a lot, but I could also hear what other people were thinking. Compared with the mind-reading skills on TV, it is not inferior. Not only that, it also allows people to quickly calculate addition, subtraction, multiplication and division within 10,000; various other functions are not to mention.

In modern society, wisdom-boosting potions are playing an important role; I also want to design more high-tech things to benefit us humans.

5. A 400-word essay on my invention in fourth grade

This afternoon, I found that my fingernails had grown long, so I decided to cut them. This was the first time I did it myself. Cut your own nails. I took the nail clipper in my hand and carefully started to cut my nails. But the cut nails fell everywhere, on the floor, on the table, on the chair... I found that cutting the nails seemed not difficult, but after cutting, it was very troublesome to sort the nails.

Is it possible to have a kind of nail scissors that can collect nails while cutting nails? Just like the pencil sharpener we use to roll pencils, we can use a container while rolling pencils. Can collect pencil shavings.

I considered that nails would fall down under the action of gravity. After thinking about the materials available at home, I decided to use a small plastic bag tied to the lower part of the nail clippers to collect nails in time. The first collection of nail clippers I invented was successfully made. Dad decided to be the first to try it, but his nails were harder than mine. When I cut them with the nail clippers, my nails would jump in all directions, up and down. Left and right, but it didn’t fall immediately into the small bag.

It seems that nail clippers that can collect nails need not only have a container that can collect nails in time, but also need a protective cover that can stop the nails from jumping around, and it should be transparent, so as not to hinder people from cutting. The sight of nails... The materials available at home are too limited, I am still thinking...

6. A 400-word essay on my invention for the fourth grade

I have an idea, if How great would it be to invent a multifunctional car?

If we encounter a traffic jam, we only need to activate the A button, and the car will slowly stretch out its wings and rise into the sky like a bird, so that the road will not be blocked by water.

If we want to travel to a distant place, we only need to press the A button, and the car will put on its wings and take us to the destination with a "swish", and we can enjoy the beauty of our motherland. Rivers and mountains! In this way, I can go out and see the world even on weekends!

If we encounter flooding, we have to activate button B. The car slowly stretched out its propeller, and the blades turned quickly like a windmill, stirring up waves of waves like a roaring flood, taking us away from the danger zone quickly.

If you are interested in going to the sea to see all kinds of beautiful fish, then you only need to activate the B button. At this time, the car will become a submarine. It will be as domineering as the "Struggle" and take you 20,000 miles under the sea. You don't have to worry about leaks or rupture.

If the parking space is tight, we can activate button C. At this time, the car became smaller and smaller like a deflated rubber ball, until it became about the size of a matchbox. In this way, it only needs a small space to park it, and it can even be carried around. Isn't it super convenient?

Wow, how amazing it would be if there really was such a versatile car! It will definitely bring infinite convenience and fun to our lives!