How to make a scientific gizmo is simple 5

The process of making a simple tech gizmo is as follows:

One, homemade badminton:

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

Procedure: Take a 250ml empty beverage bottle and cut off the top half of the bottle.

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

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

Wrap another foamed fruit net around a glass marble, stuff it into the mouth of the bottle, and tighten it to expose about 1 cm.

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.

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

Second, homemade hot air balloons:

Production process:1First of all, we cut 6 to 8 leaf-shaped pieces of paper out of soft paper.

2.Fold them in half and glue their edges together to make a balloon.

3.Tape the four wires to the bottom of the balloon. Attach the other end of the thread to the table with plasticine.

4.Try to turn the speed of the hair dryer as slowly as possible. Aim the blower up at the bottom opening and turn the switch on. The balloon will slowly grow larger, tighten the string, and leave the table.

The method of making small science inventions is as follows:

1. Remove one end of a waste can (such as Lulu beverage can) with one end of the lid 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.

2. Find a suitable plastic lid (such as the lid of the magic big roll can be buckled on the Lulu drink can), and dig a small circular hole in the lid, the size of the hole is appropriate to make the bulb plug tight. Insert the base of the bulb into the small hole.

3. Take a section of wire hunting and peel off the wire skin at both ends, wrap one end around the lamp holder, and pierce a small hole from the side of the plastic cover at 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.

4. When using, use your thumb to press the wire threaded from the side wall on the weld seam without paint 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.

Find a cup, fill half of the water, find a piece of paper and put it flat on the rim of the cup, press it with your hand, slowly invert the cup, let go, the water and paper do not fall.

You've discovered atmospheric pressure and invented a magic trick :)

Homemade fire concave mirror:

1. Take out the can, and polish the concave surface of the bottom of the can to make a concave mirror. Cans are available in both aluminium and iron, with aluminium being softer than iron, easier to sand, and more reflective.

2. Use sandpaper to polish off the trademark and protective coating on the bottom surface of the can. The finer the sandpaper, the better, here is used 1500 mesh, 3200 mesh is better. It doesn't matter if the sandpaper isn't that fine, because the sandpaper will get finer and finer.

3. Then find a piece of fine soft cotton cloth, dip some toothpaste and polish the concave surface repeatedly.

4. If it feels very dry, you can add water, and if the toothpaste is not enough, add toothpaste. Because toothpaste contains friction agents, it has the effect of grinding and polishing. How long you need to polish depends on how often and how hard you need to polish until the underside of the can is polished to the point where you can see your shadow as clearly as a mirror.

5. Hold the polished concave mirror to the sunlight, and you can see a small spot of light on your finger that is focused. Slowly change the height of your fingers until the spot is minimal and there is a burning sensation in your fingers, which is where the focus is.

6. Fix a match in the focal position with iron wire or copper wire, so that the sunlight just focuses on the match head, and after a while, you can see that the match head is ignited.

Note: Because the area of this concave mirror is small and the accuracy of the parabola is not very high, it is not easy to light a match with it. In summer, at noon, when the weather is sunny and windless, it can take 5 to 10 minutes.

Not all cans are suitable for concave mirrors, and if you find that the bottom of your carefully polished can is difficult to focus the light to a point, then you need to change the can and repeat your work.

Use an iron box and a small piece of glass as a mirror.

1.Clotheslines or rods are usually smooth, and the hook part of the hanger is also smooth, so the dried clothes will slide left and right on the rope or rod when exposed to a little wind, causing the clothes to gather in one place, which is not easy to dry. In case of high winds, it can even cause the hanger to fall off.

2.The situation is even worse when the clothesline is tilted or bent, and the laundry will all slide low and cannot be dried.

3.The width of the hanger is fixed, and the function is single. It cannot meet the needs of all kinds of clothing.