How to make science and technology works for primary school students, what are their functions? I hope there are pictures. Urgent, urgent, urgent! ! We have to hand it in tomorrow...

Paper flowers predicting the weather

Materials: pink colored paper, disposable paper cups, straws, decorations, salt water, newspapers

Production process: put pink Cut petals from paper, apply them in salt water and dry them in the sun. Glue them to one end of a straw to make a flower. Stand it in the center of the paper cup with your hands. Stuff newspapers on both sides to make soil (add water to the newspaper and press it tightly) and decorate.

"The color of the petals is thick, and the weather will be very humid or rainy soon. When it is light, the weather will be sunny."

Homemade hot air balloon

1. First we use soft Cut out 25 to 30 leaf-shaped pieces of paper. 2. Fold them in half and glue their edges together to make a balloon. 3. Use tape to stick the four connecting wires to the bottom of the balloon. Use plasticine to secure the other end of the string to the bed. 4. Try to adjust the speed of the hair dryer as slowly as possible. Aim the blower outlet downwards at the bottom opening and turn on the switch. The balloon will slowly grow larger, tighten the string, and lift off the table. Homemade soap paper

Making materials and tools: Homemade soap paper

Making materials and tools:

1. White paper with good hygroscopicity 2. Small pieces Soap 3. Jar

Preparation method:

First chop the soap and put it in the jar. Add water to make soapy water. Cut the white paper into matchbox-sized pieces, one by one. Apply the soap liquid thoroughly, then take out the white paper and let it dry to become soap paper. Homemade wall hanging flower basket

Materials and tools

Two Sprite bottles, glue, carving knife, scissors, and a nail.

Production method:

1. Take off the green bottom cover of a Sprite bottle, cut it into a lotus shape, flip it down and glue it to the bottle body to form a base. 2. Cut a 2cm wide green ring from the green bottom cover and still put it on the bottle. 3. Remove the neck of the bottle and cut a wide strip 13cm long and 8cm wide, and several narrow strips 3cm wide. 4. Use a carving knife to carve patterns on the 3 cm narrow strips, then fold these narrow strips outwards and insert them into the green ring from bottom to top. 5. Take another beverage bottle, use the bottle body, and use scissors to cut out 6 17 cm long capsule leaves. 6． Nail the flower basket to the wall, insert leaves and flowers, and the wall-mounted flower basket becomes a clean eraser with a brush

If you write something wrong, use an eraser. After wiping, there will always be a lot of debris left on the paper. Whether you pat it with your hands or blow it with your mouth, it is unhygienic and troublesome. Making a clean eraser won't be such a hassle.

Materials: large eraser, scrap brush.

Tools: scissors, glue.

Production method:

1. Dig a small shallow round hole at one end of the eraser 2. Remove the tip of the scrap brush, wash and dry it.

3. Cut off the tip of the brush tip to turn it into a small brush

4. Insert the tip of the brush into the small round hole of the eraser and stick it firmly with glue

Okay, the clean eraser is now made. Whenever you finish wiping the eraser, you can use a brush to gently "sweep" the debris on the paper, and then pour it into the wastepaper basket. Innovative invention making method 1. Homemade badminton

Preparation materials: one empty drink bottle, two foam fruit net sets, one rubber band, and one glass marble.

Production process:

1. Take a 250 ml empty beverage bottle and cut off the upper part of the bottle;

2. Cut off the Divide the portion into 8 parts, use scissors to cut to the neck of the bottle, and then cut each part into a petal shape of the same size;

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

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

5. Cut half of a table tennis ball, place the bottom of the hemisphere on the mouth of the bottle, cut the four sides into whiskers, cover the mouth of the bottle and secure it with a rubber band.

6. After beautification and modification, a homemade badminton is completed. Hit it with a badminton racket and see what the effect is?

Homemade Cockroach Catching Box

Take a piece of 220×150 (mm) cardboard.

The most important part of the capture box is the capture surface. Take a piece of plastic film, cut it to the same size as the bottom of the box, apply adhesive and spread it on the bottom of the box. The key to whether cockroaches can be caught lies in the adhesive. The adhesive has two functions: one is to introduce the cockroach into the box, and the other is to stick it firmly to the catching surface. Preparation of attractant: Mix 40% meat powder, 50% flour, and 10% bean cake. The total amount is about 20 grams. Mix well and set aside. The adhesive is a mixture of 20 grams of rosin and 10 grams of rapeseed oil. After heating to a gelatinous state, mix the attractant and adhesive and stir evenly to make an adhesive.

Evenly apply the prepared paste on the catching surface lined with plastic film, then fold it inward according to the originally drawn dotted line, and finally insert the tongue piece b into the notch a. Inside.

Due to the non-drying properties of the rosin and rapeseed oil mixture, the bait can be kept sticky for up to a week. Place the trap box in a place where cockroaches are infested. Because the box is dark and contains the bait that cockroaches like, cockroaches will crawl into the box to compete for the bait and stick to it. After it is full, the carton can be flattened and discarded, or the plastic film can be removed and the plastic film coated with bait can be replaced so that the box can be reused.

If the size of the trap box is enlarged and the composition of the adhesive is slightly adjusted, the coating can be thickened to create a cute watermark on the paper mousetrap

Thinking: How are the beautiful patterns on rice paper made if they are not drawn?

Materials: 1 washbasin, 1-2 pieces of rice paper, 1 chopstick, 1 cotton swab, 1 bottle of ink, water (about half a basin)

Operation:

1. Pour half a basin of water into the basin and gently touch the water with chopsticks dipped in ink. You will see that the ink expands into a circle on the water.

2. Take a cotton swab and rub it on the scalp two or three times.

3. Then tap the center of the ink circular pattern and see what happens.

4. Gently cover the calligraphy paper on the water, and then slowly pick it up. What pattern is printed on the paper?

Explanation:

1. When the cotton swab is touched, the ink will expand into an irregular circle shape.

2. The small amount of oil applied when the cotton swab is rubbed on the scalp will affect the force of water molecules pulling each other.

3. The watermark will appear in irregular concentric circles.

Create:

Try other ways to change the shape of the ink on the water.

6. Homemade colored candles

Materials: colored crayons, wax

Preparation methods:

1. Find a discarded canned beverage barrel (such as a 1.25-liter Coke bottle), neatly cut off the lid, and chip the wax into the barrel.

2． Put the bucket into hot water and stir the wax inside to melt it all. It's best to use boiling water. However, you need to ask your parents for help or perform this step under their supervision.

3． Pour the melted liquid into a nice-shaped container (such as a heart-shaped frame with small pieces of chocolate). Don't pour too much. As for the reason, read on. Of course, you first need to put the candle wick string in the container.

4. After the original wax cooled down, Ah poured the melted colored crayon liquid into it according to the method of divination (the colored crayons came in handy at this time). In this way, add different colors of wax layer by layer, and a beautiful candle will be made.