Science Minor Productions for Elementary School Students 20, Science Minor Productions for Elementar

Materials and tools for crafting:

Hygroscopic white paper, small pieces of soap, a brush and disposable beverage cans.

Production method: first chop the soap and put it in the jar, put the cup on the stove after filling the appropriate amount of water, wait for the soap to melt, cut the white paper into the size of a matchbox, apply the soap liquid one by one, and then take it out to dry it to become soap paper.

When you want to wash your hands, wet your hands with water, then gently rub them with the prepared soap paper to create a lather, remove dirt, and finally rinse with water.

Make a periscope.

To make a periscope, you only need two small square mirrors of the same size and a piece of cardboard. If your small mirror is ten centimeters long and seven centimeters wide, then you should prepare a piece of cardboard with a width of 4 7 = 28 centimeters. The length of the cardboard can be decided for yourself according to the conditions.

The cardboard is longer, and the periscope can be made taller.

Three parallel lines were drawn on the cardboard, each with a distance of seven centimeters, as shown in the diagram. Cut off the blacked-out parts. Use a knife to make a mark along the dotted line (be careful not to cut through).

Then, fold it around the table to make a rectangular box and glue it with kraft paper.

Glue the small mirror with white tape as shown in the picture below (so that the angle between the small mirror and the long carton is equal to 45°). Two small mirrors are aligned in parallel. In this way, a periscope was made.

If the small mirror in your hand is less than 10 centimeters long, you can calculate the size of the carton according to the Pythagorean theorem, provided that the angle between the mirror and the carton is 45°. It's fun to use a periscope to ** the scenery outside the window, and you can also use it to hide and seek. Of course, periscopes were made primarily for scientific research and national defense.

Scientists use periscopes to observe the launch of rockets in the basement; When conducting atomic physics experiments, researchers use periscopes to observe dangerous experiments that are radioactive through a thick protective wall. When the submarine is underwater, it must also use a periscope to observe the situation on the sea surface.

Who invented the periscope is now impossible to find. The earliest ancient book in the world to record the principle of periscope is the Huainan Wanbi Technique in China in the second century BC. The book records such a passage: "Take a large mirror and hang it high, and put the water tray under it, and you will see the neighbors." ”

In ancient times, under the eaves of some ancient temples in the deep mountains of our country, a large bronze mirror is often hung obliquely, if a basin of water is placed on the ground within the temple gate, the mirror is aligned, this is made into a simplest periscope, and the sheep intestine path and passing pedestrians outside the temple gate will be reflected in the water.

Assemble models, make parachutes, and make "God 6" model ......

I like to do this since I was in elementary school, and I even served as the leader of the aviation module drop.

You can make a house with paper, I did this last time for my little nephew, and the effect is not bad, and there are all the things in it.

Buy a small light bulb, the kind on the flashlight, add two dry batteries, plus a wire or aluminum wire, make a simple flashlight, connect one end of the wire to the bottom of the battery, the other end is wrapped around the bulb, and then put the bottom end of the bulb on the front of the battery, and you're good to go.

Homemade coloured candles.

Materials: colored crayons, wax.

Directions:1 Find a discarded canned beverage bucket (e.g. 1 25 litre Coke bottle), neatly cut off the lid, and cut the wax into the bucket.

2 Put the bucket in hot water and stir the wax inside until it melts completely. It is best to use boiling water. However, ask your parents for help or be under the supervision of your parents.

3 Pour the melted liquid into a nicely shaped container (e.g. a heart-shaped box with small pieces of chocolate). Don't pour too much. As for the reason, look down. Of course, you first need to put the thread in the container as a wick.

4 The original wax cooled, and Ah poured the molten colored crayon liquid into it according to the method of dividing the face (the colored crayons came in handy at this time). In this way, the wax of different colors is added layer by layer, and the beautiful candle is made.