Technological gizmos. What can I do at my second year of junior high school? For example...

One match outer box, and two match inner boxes. A glass bead, tape, production method: first hollow out a matchbox inner box, cut off the horizontal bar at one end, tie a small hole of just the right size to put the glass beads in the middle of the other end, put the glass beads in, cover it with a white paper with a small hole equal to the diameter of the glass beads in the center, and the first step is completed.

The second step is to open a small long hole of about one centimeter in front of the lens of another match, glue a piece of glass to the hole, and glue it firmly with adhesive tape, so that the stage is finished. The lens holder only needs to cut a square hole on one side of the label as the entrance port. The fourth and final step is to install the reflector:

Glue the back of the mirror, fold the tape back 90 degrees, and stick it to the lower end of the inner box of the matchbox to make the mirror tilted. To use, place the object to be observed on the glass on the stage, and insert the lens holder so that the small window is facing the light source. Adjust the height and you can see the magnified object clearly.

It is recommended that the landlord use his brains more.

Think for yourself. Gadgets that can keep them clean are also tech inventions.

That's a lot of range.

Have you ever learned electromagnetic induction, if you have learned, let's make an electromagnetic cannon and take it out to make sure that your classmates are calm.

Technological gizmos. Please tell us the detailed requirements.

Read more of your physics books for inspiration.

This is on the **, there is, a small production of science and technology material package. I bought a lot, what vacuum cleaners, cars that can walk, sound and light can be used. You search.

You can make slippers, you first find a pair of slippers, then take a sponge or handkerchief, glue the wooden board or cardboard to the shoe board, cut it into strips, and finally glue it to the wooden board or cardboard with adhesive tape, and you're done! So when you want to watch TV, and you want to mop the floor, you put it on, put it on with water, wring it out, and watch it while taking it off, which is very convenient!

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.

Materials: 1 cola bottle, super glue, pointed scissors, 1 pen refill, 1 waste newspaper.

1.Use scissors to drill a hole as big as a refill in the bottle and put the refill inside.

2.Attach the refill to the cap with super glue.

3.Wrap newspaper around the refill.

One water rocket is done.