Urgently looking for a scientific and technological gadget for the first year of junior high school!

Innovative gadget production method 1, homemade badminton.

Prepare materials: 1 empty drink bottle, 2 foam fruit net covers, 1 rubber band, 1 glass marble.

Production process:1Take a 250ml empty beverage bottle and cut off the top half of the bottle;

2.Divide the cut part into 8 equal parts, cut it to the neck of the neck with scissors, and then cut each part into the shape of petals of the same size;

3.Put the foam fruit net sleeve on the outside of the bottle and fix it at the mouth of the bottle with a rubber band;

4.Wrap another foamed fruit net around a glass marble, stuff it into the mouth of the bottle, plug it tightly and expose about 1 cm;

5.Cut off half of the ping pong ball, cover the bottom of the hemisphere on the mouth of the bottle, cut the four sides into a whisker, cover the mouth of the bottle and fix it with a rubber band.

6.After beautification and retouching, a homemade shuttlecock was completed. Hit a dozen with a badminton racket and see how it goes?

Homemade flashlight :

The specific method of making it is to remove one end of the lid of a waste can (such as a Lulu beverage can) and knock the other end with a round hammer. Roll up two No. 1 batteries with thick corrugated cardboard and put them into the tank with the positive electrode facing up and the negative electrode facing down.

Find a suitable plastic lid (such as a magic big roll lid that can be fastened to Lulu cans) and dig a small circular hole in the lid** in such a size that the bulb is plugged in tightly. Insert the base of the bulb into the small hole. Take a piece of wire hunt and peel off the wire skin at both ends, wrap one end around the lamp base, and pierce a small hole through the side of the plastic cover with the other end.

Place the plastic lid over the can. Check that the bulb and battery are in close contact. At this point, the disposable flashlight is ready.

When using, use your thumb to press the wire threaded from the side wall on the weld that is not painted from the can, the flashlight will glow, and the thumb will jump off the wire, and the flashlight will go out, which is very convenient to use.

Small inventions for primary school students: simple and practical, low-cost production.

Let's go see the Queen of Housekeeping. There's a lot of it in there. Just get a few.

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.

Or: 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. , thank you

Simple wind turbine physics plus art plus production: a can, a pair of scissors, a tinplate, a wooden strip, a four-wheel drive motor, a bottle of super glue, some colored LED bulbs (or bulbs, diodes).

A: Use scissors to cut off the upper part of the can by about 1cm, keep the remaining can, that is, make a "cup" first, and then draw three at equal intervals on the cup, then keep these three, cut off the remaining excess, and then present a round base with three blades, like a propeller, and then use the tip of scissors to drill a round hole slightly smaller than the central axis of the motor in the middle of the base.

B: Tinplate (i.e., ordinary pieces of iron) wraps the motor firmly and then nails it to the wooden strips.

C: Fix the blade on the central axis of the motor with super glue to ensure the vertical, horizontal and windward nature of the blade.

D: Connect the two wires of the motor to the LED bulb to ensure that the wire interface is connected normally (positive and negative, good contact).

E: Running forward quickly with a wooden strip in hand, or installed on a bicycle, pushing the rotation of the blades under the action of the wind, and then pushing the rotation of the motor rotor, so the magnetic generation of electricity, the LED bulb will be on, if the wind is sustainable and stable, then there is no difference with a battery, if the wind is big and small, the LED bulb is on and off, if you add a sensitive charger, then you can store the current, and then release the current, it will be ideal.

Hehe, the invention went to apply for a patent.

Here's a title for you: retractable hangers.