Simple seabed materials: a narrow plastic bottle, clay, a plastic hose, some coins, adhesive tape.
1. Dig two or three holes in one side of the plastic bottle. On the same side of the bottle, three or four coins are fixed with tape. These coins are heavy enough to sink the submarine.
2. Put the plastic hose into the narrow mouth of the plastic bottle, and then seal the gap between the hose and the bottle mouth with clay.
Put this toy submarine in a basin of water and fill it with water.
4. Blow air into the submarine from the hose. When you blow, the water in the submarine is pushed out of the hole.
When the submarine is inflated to a certain extent, it will slowly surface.
As long as the amount of air in the submarine is well controlled, the submarine can float and sink in the water.
why ...
Air is lighter than water. When you fill the submarine with air, it becomes lighter than water, so it will float to the surface.
Let the sound be visible: an empty jar, a balloon, a pair of scissors, a rubber band, a rope, glue, a flashlight, and a lens slightly larger than the fingernail.
Experiment:
1. Cut off the bottom and surface of the jar to make it a hollow tube with bright ends. Cut off the neck of the balloon and cover one end of the jar. Grab the edge of the balloon and tie it tightly with a rubber band (like a drum head).
2. Glue the small lens to the tight balloon drum surface, so that the mirror faces outwards.
Turn on the flashlight and shine on the mirror, and you will see a light spot reflected from the mirror to the wall. If the light spot on the wall is not clear enough, you can use a piece of hard white paper as the screen.
4. Put the tin can on the table, fix it with books, and adjust the proper angle of flashlight, mirror and light spot. You look at the lamp on the wall and shout or sing at the other end of the tin can. Wow, the light spot shook and danced.
Principle: Sound is produced by air vibration. When you sing, air from the lungs vibrates the vocal cords, producing pressure waves (also called sound waves). This sound wave hits the balloon membrane like ripples in water, and the balloon membrane vibrates with it, so the light reflected by the small mirror moves with it.
Equipment needed for turning water (1): a plastic spoon and tap water in a coconut party drink can.
(2) How to operate the experiment:
First, turn on the tap to adjust the water flow to the minimum, then rub the plastic spoon in the coconut tree party drink can on the clothes several times, and put the rubbed plastic spoon next to the water flow, close to the water flow.
(3) What will happen:
The water seems to have been pulled by a plastic spoon and turned a corner.
(4) Why:
Because the plastic spoon is charged when rubbing clothes, the water flow is attracted by the spoon and looks like a turn.
(5) How did you come up with it:
Once, I finished the drink and pulp in the coconut tree party drink can, so I took the can and spoon and played with water under the tap. I accidentally dropped my spoon and it was covered with dust. I picked it up and wiped the dust on my clothes, ready to pick up the water with a spoon. When the spoon approached the tap water, a strange phenomenon happened, and there seemed to be a force on the spoon to pull the water over. So I tried several times and the same phenomenon happened, so I designed this experiment.
(6) What should be paid attention to: the spoon is close to the current, so don't touch the current.
Soap bubbles that will get bigger: don't touch soap bubbles. Can you make the "fragile" soap bubbles bigger and bigger?
Materials: scissors, straws, round paper tubes, washbasins, soapy water.
Operation:
1, prepare some strong soap solution, so that the blown soap bubbles are not easy to break.
2. Cut four incisions with the same depth at one end of the straw with small scissors, and then fold the cut strips backwards.
3. Blow out a big bubble with the end of the straw.
4. Wet one end of the circular paper tube in the middle of the toilet paper with water, quickly and lightly put soap bubbles on the soaked paper tube, and let the soap bubbles stand firmly at one end of the paper tube.
5. Fill half a basin with water and put the end of the round paper tube without soap bubbles into the water.
6. Slowly press down the paper tube until most of it is submerged.
7. If the soap bubbles burst, repeat the above steps.
8. Soap bubbles will get bigger and bigger. Finally, with a bang, the soap bubbles burst.
Reason:
When the paper tube is pressed under water, the air in the tube is under the pressure of water, and its own pressure will increase, so that more and more air will penetrate into the soap bubbles on it and blow the soap bubbles bigger and bigger.
"Walking" glass I. Creative description:
Experiment is the mother of science, and wisdom is the son of experiment. All reasoning must come from observation and experiment. Learning to use your hands and brains actively, learning and understanding science and truth in experiments will certainly shed more brilliant sunshine on the road of children's growth. We all know that people, animals and birds all walk with legs, but the glass we see in our daily life can walk without legs. Can you believe it?
Second, the experimental materials:
1 glass, 1 candle, 1 box of matches, 1 glass plate, 2 thick books and a little tap water.
Third, experimental steps;
1. First, soak the glass plate in tap water.
Then put one end of the glass plate on the table and two books on the other end.
3. Dip some water into the cup mouth again, and then buckle it upside down on the top of the glass plate.
4. Finally, light the candle and bake the bottom and sides of the cup.
Fourth, the experimental results
I magically found that the glass poured on the glass plate actually "walked" down from above.
Verb (abbreviation of verb) matters needing attention
After repeated experiments, I found that the combined height of the two books is only about 5 cm. Too high or too low, the glass will not be free, smooth and natural in the process of "down".
Six: research results
Bake the bottom and around the glass with candles. The air in the glass will expand when heated, and the volume will become larger. The air that can't be held will be squeezed out. However, because the cup mouth is upside down and sealed by a layer of water seal, the hot air can't get out, so we can only push the cup up a little, and the cup will slowly "walk" down under its own weight.
Seven, experimental experience
Through this experiment, I think innovation is the soul of a nation, the driving force of national prosperity and social development, and the gene of talent growth. The cultivation of primary school students' scientific and technological innovation ability should start from an early age, from now on, and from small things.