In my first year of junior high school, I made a small invention in the science and technology festi

Summary. Hello <>

There are a lot of ideas and possibilities when it comes to tech gadgets for grades 3 to 6. Some of these can be simple mechanisms, such as mechanical pencil sharpeners or automatic page turners; Others may be electronics, such as homemade video games or smart home control systems. These inventions not only help students improve their creativity and problem-solving skills, but also help them better understand the principles of science and mathematics and apply them in real-life situations.

In addition, through such projects, students develop teamwork and communication skills, as well as learn how to turn an idea into reality.

3-6 grade science and technology inventions.

Hello <>

There are a lot of ideas and possibilities when it comes to tech gadgets for grades 3 to 6. Some of these can be simple mechanisms, such as mechanical pencil sharpeners or automatic page turners; Others may be electronics, such as homemade video games or smart home control systems. These inventions not only help students improve their creativity and problem-solving skills, but also help them better understand the principles of science and mathematics and apply them in real-life situations.

In addition, through such projects, students develop teamwork and communication skills, as well as learn how to turn an idea into reality.

When designing scientific and technological inventions, it is recommended that students start with the needs of their daily life, find the problems that need to be improved or solved, and then think about how to solve them with scientific and technological means. At the same time, students also need to understand some basic circuit knowledge and programming skills in order to be able to implement their own ideas. Finally, students need to pay attention to the safety of the whole problem to ensure that their invention does not pose any risks and dangers.

The most and easiest one:

Table tennis ball picker:

Materials: empty mineral water bottle, rubber band, wooden stick about one meter long (optional), table tennis ball.

Tools: scissors, needles.

Production method: (1) Scissors the rubber band and cut it into a line from a closed circle. (2) Remove the advertising paper from the mineral water bottle.

3) Cut off the underside of the mineral water bottle. (4) Cut a hole about 3 5 cm below the mouth of the bottle, this hole must allow the ping pong ball to be easily put in or taken out. (5) Pierce a small hole with a needle above the bottom surface of the mineral water bottle, and pierce another hole of the same one on the opposite side of this hole.

6) Thread the two ends of the rubber band into the two small holes and fix it so that the rubber band is tight at the bottom of the bottle. (7) Unscrew off the cap of the bottle and insert the wooden stick, paying attention to the part of the wooden stick inserted into the bottle, and not going to the hole below the bottle mouth to make the ping pong ball enter and exit. (This step is optional).

How to use: Put a table tennis ball on the ground, cover it with the bottom of the finished ball picker, then the table tennis ball will be bounced into the bottle through the rubber band without falling out, and finally take out the table tennis ball from the small hole under the bottle mouth.

Seawater purifier: a large basin for seawater, a smaller bowl in the middle of the basin, a plastic bag on the outside, some small stones on the plastic bag, and the instrument can be used in the sun.

Fruit battery bar.

Principle and production method of fruit battery.

Principle: The electrochemical activity of the two metal sheets is not the same, the more active metal sheet can replace the hydrogen ions of the acidic substances in the fruit, due to the positive charge, the whole system needs to be stable, so in the case of the formation of galvanic cells, the electrons maintain the stability of the system from the loop, so theoretically the current size is directly related to the concentration of fruit acid, in this case, if the length of the loop changes, it will inevitably cause the change of the loop, so it will also cause the change of voltage.

Ingredients: 3 lemons, 3 coins.

Three galvanized screws (or sheets of aluminum).

Four wires, preferably with clips on the wires.

A knife and a small paper sticker.

A light-emitting diode driven by a low voltage. I use the radio shack's model 276-330.

A 35mm plastic film shell or similar small container. It is best to use a black opaque film shell. A nail or small awl for drilling holes in shading containers.

Plating" screws can be bought at hardware stores. Galvanizing the screws is to prevent them from rusting, and the wires can be bought at the Electronic City.