Interesting experiments, what are the interesting experiments

Just after the summer vacation, my mother ordered a "toy" for me on the Internet - "Electricity Experiment Box".

This is a small instrument box, open the box, it contains a lot of small instruments and parts for experiments: DC volt meter, DC ampere meter, sliding rheostat, fixed value resistor, single pole switch, battery box, small lamp holder, electric beads and fork type wiring, etc. My curiosity caught hold on to these various forms of experimental instruments.

I couldn't wait to start the experiment according to the "Instruction Manual" under the guidance of my mother.

According to the instructions, I first did the first experiment: two single-pole switches, a pair of batteries and a battery box, two lampholders, and two beads connected them into a series circuit with fork wires. In the course of the experiment, as long as I disconnect any switch or loosen any bead, both light beads will go out at the same time, indicating that the entire circuit is disconnected.

Then we started a second experiment: adding a single-pole switch to the first experiment and reconnecting them into a parallel circuit. Of the three single-pole switches, only one of the parallel circuits is a trunk switch, and the other two are branch switches.

As soon as I disconnect the trunk switch, the whole circuit will be disconnected, and if I disconnect one of the branch switches, the circuit on that branch will be disconnected with it.

I repeated the experiment several times following both methods.

From these two experiments, I learned that in a series circuit, the switch is connected in series at any position, and its function is the same; In a parallel circuit, which branch the switch is in, it can only control this branch. The switch in the trunk circuit has the same function as the switch in series.

After doing this experiment, my mom and I looked at the house. circuits, found that the lights used in each of our rooms are in parallel, and their respective control switches are in series, after experiments, I understand that through the connection of the unchanged circuit, we can more conveniently control electricity and use electricity to serve our daily life.

Interesting experiments are as follows:

1. Straw that penetrates the potato.

This experiment uses the force of air to pierce the potatoes through the force of air. We plug one end of the straw with our fingers, and the only outlet for the air in the straw is the end of the potato, and the volume of air in the straw becomes smaller at the moment of insertion into the potato, and the pressure on the surrounding area increases.

But this force is not strong enough to push the fingers and the walls of the straw, and can only be rushed out of the relatively weak potato, so we can use the straw to penetrate the potato.

2. Balance the bird.

The reason why the balanced bird is balanced is that after the paper clip is added, the center of gravity is moved forward from the middle of the bird's body to the beak, which means that the actual center of gravity of the whole bird is below the tip of the beak.

By placing the beak of the bird in your hand, like a basket hanging from your finger, the bird will be held securely. Balance beam athletes can perfectly display a variety of difficult gymnastics movements on the balance beam, and it is also because the athlete can control his center of gravity well, so he can achieve a balanced state.

3. Running hoops.

In this experiment, we stretched the rubber band and then released the bottom, because the elastic rubber band contracted upwards to return to its original shape, there is static friction between the iron ring and the rubber band, which will rise with the rubber band. And we cover the tapering bands with our hands, which are getting shorter, and it looks as if the hoops are rising on their own.

4. Outwit the banknote cave feast.

The banknote is quickly tapped down with a finger, using the principle of inertia. Inertia is an intrinsic property of an object, a property that keeps an object at rest or moves rapidly in a straight line, resisting a change in the state of motion.

In rapid draws, when the acceleration of the banknote movement is greater than the maximum acceleration shutter brightness that friction can provide, the coin and bottle move relatively backward, and gravity plus inertia, so that they do not move.

5. Track Strange Slope.

Every object in our lives is subjected to the gravitational pull of the earth, and this force is gravity. Due to gravity, the center of gravity of an object has a tendency to move downward (fall or roll), causing its center of gravity to keep lowering. In this experiment, when the two joysticks are parallel, the center of gravity of the ball is parallel to the two woods, so the ball rolls from the height of the wood to the low.

As the higher part of the shaft slowly separates, the ball is at the largest opening of the shaft and has a lower center of gravity than the lowest part of the shaft. Therefore, the ball tends to roll in the direction of the larger opening of the wooden pole and the lower center of gravity, forming a "strange slope" phenomenon.

An interesting experiment is done as follows:

Experiment 1: Angry bottles

Experimental Materials:Transparent plastic bottles, baking soda, white vinegar, small balloons.

Experimental stepsSuddenly

1. Fill a plastic bottle with an appropriate amount of white vinegar.

2. Pour baking soda powder into the balloon.

3. Put the small balloon tightly around the mouth of the bottle.

4. Slowly pick up the balloon and let the baking soda powder in the balloon flow into the plastic bottle to observe the phenomenon.

Experimental Principle:When baking soda meets white vinegar, it will chemically react to produce carbon dioxide gas, so the balloon will become larger.

Experiment 2: A can that rolls

Experimental Materials:Plastic tubes, dry towels, cans Kaihe.

Experimental Procedure

1. Rub the plastic tube back and forth with a dry towel.

2. Take the plastic tube that has been rubbed several times close to the can, and pay attention to keep an appropriate distance from the can.

3. Translate the plastic tube and observe the changes of the can.

Experimental Principle:When a dry towel rubs against a plastic tube, static electricity is generated, and the plastic tube with static electricity pulls the can.

Experiment 3: A self-driving boat

Real Li Sun La's test materials:2 pieces of paper, dish soap, small basin of water.

Experimental Procedure

1. Pour water into the basin.

2. Put the No. 1 piece of paper into the water, which is stationary without external force.

3. Add dish soap to one end of the No. 2 piece of paper.

4. Put a small piece of paper with dish soap into the water, and the piece of paper will "drive" automatically like a boat with a motor.

Experimental Principle:Dish soap is a surfactant that reduces the surface tension of water. The surface tension of one end with dish soap added is less than that of the end without dish soap, and the paper will be attracted by the surface tension at the other end and move forward.

Today, when I came to my father's office out of breath after playing ball, my father took out a lot of strange things and said to me, "Li Jian, do you want me to do an interesting experiment for you?" I said

Okay! But what do you use to do it? Dad pointed to the pile of things in his hand and said

That's it! I said, "Huh?

No way! How can it be? What experiments are you going to do?

Eating fire experiment," my father said with a wicked smile.

Then he took out a bottle of alcohol, and then he took out a peeled pear, and soaked it in alcohol, and then he took a candle and lit it with fire, and then he took out the pear, which had been soaked in alcohol, and then he took out the pear, which had been soaked in alcohol, and lit it with a candle, and then, the important moment came, and a miracle happened! Daddy swallowed the still flame-breathing Sydney!! I yelled, "Wow!

Dad, are you dying? Aren't you afraid? Oh my god!

Don't let anything happen to you! "I thought with prayer and with urgency. After a few minutes, it was amazing!

Dad was actually fine, and he chewed happily, and said that it was delicious, it was really strange! I asked my dad, "Dad, aren't you afraid?"

Could it be that you have cultivated a vajra mouth that is not afraid of fire? I said in amazement. Dad told me:

It's nothing, as long as you put the pear in your mouth and keep your mouth closed and don't breathe, that's it, how about it, do you want to try it?. I said, "Yes!"

Dad repeated what he had just done, and then he brought me the burning pear and said, "Wait a minute, you can eat it when I tell you to eat it, and you can chew it when I tell you to chew it, remember!" I looked at Sydney, who was still burning on fire, and said with fear

Good. So, I took the pear, "eat," Dad said, I immediately put the pear in my mouth, and after a few minutes, Dad said, "Chew."

So, I ate it, and ah! It's really delicious! And I didn't feel any pain at all, I thought it was really strange, so I asked my father, and my father said:

Everyone knows that fire is burned by air, because when we eat it, we immediately shut up and stop breathing, then there is no air in our mouth, and the fire is naturally extinguished, so it's okay! ”

Yes! It turns out that there are such wonderful experiments in the world!