The principle of blowing paper strips, what physics knowledge is used in blowing paper strips

Silk "sound exercises.

Through the previous question, when we practice deep breathing, we can try to stop inhaling suddenly, but we must stop at the same time, feel that our diaphragm is still in a state of inhalation, then wait for 5 seconds, in this state, start to exhale. When exhaling, you can't relax because you hold your breath for too long, but exhale slowly, and be sure to make sure that the exhalation is even.

If you can't feel whether you are exhaling evenly, then when you exhale, you make a "silk" sound in your mouth, and when we find that the sound has been "p", it means that we are exhaling evenly. This kind of training is actually training our diaphragm, so that it can be exercised, can retain breath, and at the same time can train us to effectively control our breathing process, which is a very interesting training process.

2. "Ha Qi" practice method.

Use our imagination to use our imagination, how much we like to breathe on the window when we are young, in fact, the process of breathing is very easy to exercise us to take deep breaths and empty the exhaust gas in our lungs. Therefore, we can usually think of our palms as a piece of frosted glass, and then try to breathe into the palms of our hands to melt the frost on our hands.

3. Tire leak method training.

Have you ever heard the "silk" sound when the air flows out from the small control after the tire is punctured, and the "silk" sound gradually becomes inaudible as the tire deflats. We can try the following to imitate such a sound.

4. Imitate trains.

Think of yourself as a steam engine train, and your lungs are the heart of the train: the steam engine. Imitating the sound of a train propelled by a steam engine, the sound starts very slowly, then gets faster and faster, and our arms must not be idle, to imitate the movement of the piston rod.

This exercise process not only exercises the abdominal muscles, but also exercises the rhythm of our singing.

5. Exercise by blowing paper pieces.

When we don't know whether the process of our exhalation is even, we can tear off a piece of paper, pinch one end with our hands, and slowly blow the lower end of the note with good breathing, keeping the distance at about 10-20 cm. If the note goes up and down, it means that we still need to strengthen the exhalation exercise, and do this kind of training regularly to effectively exercise our abdomen.

6. Cut off the breath.

First take a deep breath to fill your lungs, then start exhaling, your teeth should be closed as you exhale, and then make a slight sound, and as you exhale, cut off your breath occasionally, but keep the volume consistent each time. One breath is issued in several parts, which can effectively exercise our diaphragm.

7. Breathing training combined with vocalization.

The ultimate use of breath is to make sounds, so the two need to be combined so that the trained effect is more practical.

It can be seen that how to control the breath is actually very simple, but we need to insist on continuous learning, and we must not fish for three days and dry the net for two days.

The airplane can fly into the sky by using the principle that objects are pushed in the direction of fast air flow. The airplane is made into a streamlined shape, which can be obtained by v=t s. The distance of air flow is larger in the upper part of the aircraft, and the time of the upper part of the aircraft is the same as that of the lower part, so the air flow velocity in the upper part of the aircraft is relatively fast.

The plane will be able to fly. 2.Use two small strips of paper to put them in two hands in pairs, (the notes must be placed in half).

Then blow into the middle. You'll notice two small notes moving closer to the middle. This proves that the object is being pushed in the direction of the fast flow of air.

The airplane can fly into the sky by using the principle that objects are pushed in the direction of fast air flow. The airplane is made into a streamlined shape, which can be obtained by v=t s. The distance of air flow is larger in the upper part of the aircraft, and the time of the upper part of the aircraft is the same as that of the lower part, so the air flow velocity in the upper part of the aircraft is relatively fast.

The plane will be able to fly. 2.Use two small strips of paper to put them in two hands in pairs, (the notes must be placed in half).

Then blow into the middle. You'll notice two small notes moving closer to the middle. This proves that the object is being pushed in the direction of the fast flow of air.

The airplane can fly into the sky by using the principle that objects are pushed in the direction of fast air flow. The airplane is made into a streamlined shape, which can be obtained by v=t s. The distance of air flow is larger in the upper part of the aircraft, and the time of the upper part of the aircraft is the same as that of the lower part, so the air flow velocity in the upper part of the aircraft is relatively fast.

The plane will be able to fly. 2.Use two small strips of paper to put them in two hands in pairs, (the notes must be placed in half).

Then blow into the middle. You'll notice two small notes moving closer to the middle. This proves that the object is being pushed in the direction of the fast flow of air.

1. After class, the class was silent, Teacher Lu walked up to the podium with light steps, looked around for a week, and said with a smile: "Today, let's do an experiment!" As soon as they heard that they were going to do the experiment, the students couldn't contain their excitement and cheered one by one.

What experiments can you pay attention to? The teacher "brushes!" on the blackboard! Brush!

If I hold a strip of paper in each hand and blow it three or four centimeters apart, which way will it float? The teacher's words were like a match that ignited the spark of curiosity of the students, and the classroom was like an explosion, some said to float forward, some said to float up, and some said to float to the side......Of all shapes and sizes. The teacher said:

Facts speak louder than words, let the oath speak for itself! ”

2. "Who wants to come up and blow a note and borrow the riddle of facts?" The students raised their hands one after another, like a small forest. The teacher taught a female classmate to come up and blow it, and she came to the podium, as if to say that it was too simple, and it was simply Zhang Fei eating beans - a piece of cake.

She took a deep breath and said, "Whew!" The note floated forward, and then closed again. Unconvinced, she blew several more times, but the note was tangled together like two snakes.

When the paper is blown in the middle, the air flow pressure becomes smaller, and the air pressure at rest on the outside of the paper is large. ”

4. We suddenly realized: "So that's the case!" ”

a. When blowing, the air velocity above the paper strip is large, and the pressure above is known from the relationship between the fluid pressure and the flow rate, and the air flow velocity below remains unchanged and the pressure remains unchanged, and the paper strip floats up under the action of pressure difference, which is correct;

b. According to the direction of gravity, it is always vertically downward, so when the hammer line is parallel to the mullion of the painting, it means that the painting is positive, and the statement is correct;

c. Due to inertia, paper airplanes can still move forward after leaving their hands, which is correct;

d. When using a straw to suck a drink from a bottle, it is using the effect of atmospheric pressure When inhaling, the air pressure in the straw decreases, and the drink enters the mouth under the action of atmospheric pressure, which is wrong

Therefore, choose D