Question 5 about levitation, question about levitation

The suspended object does not rise, the object sinks after falling into the water, and finally stands still suspended in the water. The buoyancy of an object at any depth in the water is the same and is equal to the gravitational force of the object, so the net force of buoyancy and gravity is 0The object is subjected to the resistance of the water after falling into the water, the velocity is reduced to 0, and the state of motion does not change without the action of an external force.

It depends on whether he will sink to the bottom, if after giving the initial velocity, the object sinks to the bottom, then he will not float up again, if it does not sink to the bottom, it will float up. The reason is that if you give him speed, the object will sink first due to its inertia, and when the resistance of the water is too large, the sinking speed of the object will decrease, and the final velocity will be 0. At this point, in equilibrium, buoyancy equals gravity, so he will return to the state of suspension at the beginning.

The position of the suspended object in the water is random, the object you are talking about falling from a high altitude and then moving back in the water to the bottom, at that time, because the falling object has gravity, when it enters the water, it has an acceleration and initial velocity, so it will descend and rise.

There is inertia when falling, and when it falls into the water, it sinks some distance, and the post-buoyancy makes him rise, and when gravity is equal to buoyancy, it floats in the water. The deeper the water, the greater the buoyancy.

You're talking about a floating object, a suspended object, and excluding the case where the density gradient of the liquid has a depth that has bottomed out, it will be suspended at a certain point almost randomly, whereas if the liquid has a density gradient, then the buoyancy is changing.

When an object that could otherwise be suspended in the water falls from a high altitude into the water, it first sinks to a certain depth and then rises to the middle of the water. Is there any experimental proof of this phenomenon?

I feel that the object that could have been suspended in the water, at what depth it is suspended in the water, is completely random.

Unless there is one case, where the volume of the suspended body is changed by water pressure. In that case, the imagination you described will appear.

It is not the action of force.

It's that it has inertia.

So

First, the reference is different.

1. Suspension: refers to the state of an object immersed in a liquid, the buoyancy is equal to its weight, and the object is in the liquid.

2. Floating: refers to the force of an object immersed in a liquid or gas to be vertically supported by a liquid or gas.

Second, the source is different.

1. Levitation: Chapter 11 of the third part of Wei Wei's "Oriental": "In fact, his work is very suspended. ”

2, floating: "Warning World Words: Qiao Yanjie's Concubine Breaks Home": "I saw a dead body floating on the water, wearing green clothes. Zhou Erfu "Morning in Shanghai" Part 4: "He is like sitting on a helpless sampan, floating on the vast ocean. ”

Third, the nature is different.

1. Levitation: the buoyancy it receives is equal to its gravity; Suspended objects can stay at any height in the liquid. Objects can be suspended in liquids or gases.

2. Floating: When the top interface of a floating body cannot contact the liquid, only the upward pressure acting on the bottom interface will produce buoyancy. As for an object located on the bottom surface of the container, this phenomenon is not very much, because as long as there is a thin layer in between.

Suspension refers to the presence of an object inside a liquid or in the air.

Floating, on the other hand, refers specifically to the fact that the object is on the surface of a liquid.

One. Levitation means: (moving) solid particles move in a fluid without sinking: dust in the air.

Two. Synonyms of levitation: to float in the air.

Antonyms: sedimentation.

1.Water vapor is densely suspended in the air.

2.The trunk of the Wolong pine is coiled, with the momentum of a dragon; Its roots are deeply rooted in the soil, like a dragon's tail; Its canopy burst out of the platform, suspended in mid-air, and looked up like a dragon's head; Its strong branches are like sharp dragon claws. The dragon leaped forward as if it were about to soar into the air.

3.Losing the restraint of the green lotus, the originally extremely small cyan flame suddenly trembled and swelled nearly several times, but in an instant, the cyan flame turned into a flame and was suspended in mid-air.

4.The clouds of the mountains floated like islands.

5.Colorful paper lanterns are dotted among the treetops, like dreamlike night flowers, suspended in the air.

6.After a drizzle, the dust that had been suspended in the hollow god transformation was gone.

7.A lot of sorrow is suspended in the cave, like the lonely and helpless waning moon. The end of the world is close at hand, and there is nowhere to rely on.

Suspension is a physical term whereby solid particles are dispersed in a fluid.

Solid particles dispersed in a fluid are called suspension. For example, a liquid sol with solid particles as the dispersed phase is called a suspension or suspension. Solids suspension operates over a wide range of areas, with particles settling at a rate of free sedimentation and solids concentrations of up to 50% by mass before the alarm.

Objects can be suspended in liquids or gases.

When the object is suspended in gas, f float = g matter, gas = matter.

When the object is suspended in a liquid, f float = g matter, liquid = matter.

When the buoyancy of an object immersed in a liquid is equal to its weight, the state of the object in the liquid is called liquid rolling out and suspended. A suspended object is characterized by the buoyancy it experiences equal to its gravitational force; Suspended objects can stay at any height in the liquid.

Summary. The same point of floating and levitating.

Both floating and suspended objects are stationary in the liquid and are subject to only gravity and buoyancy, which are equal according to the two-force equilibrium condition.

The difference between floating and levitating.

When suspended, the object stays anywhere inside the liquid, and it must be completely submerged in the liquid; When suspended, the object is submerged in the liquid, so v row = v matter.

Floating, on the other hand, is stationary on the surface of the liquid, and part of it must be exposed on the surface. Whereas, when floating, only a part of the object is immersed in the liquid, so V rows.

Special note: When floating and levitating, the object is only affected by two forces: gravity and buoyancy.

The difference between levitation and floating.

The same point of floating and levitating, floating and suspended objects are both stationary in the liquid, both are subject to only gravity and buoyancy, and according to the two-force equilibrium condition, gravity and buoyancy are equal. When the object stays anywhere inside the liquid, it must be completely submerged in the liquid; When suspended, the object is submerged in the liquid, so v row = v matter. Floating, on the other hand, is stationary on the surface of the liquid, and part of it must be exposed on the surface.

Whereas, when floating, only a part of the object is immersed in the liquid, so V rows.

Is that true for teachers? Is that object floating in water buoyant gravity?

The vertical direction of an object floating on the water is only gravity and buoyancy, and the buoyancy is equal to the net force of gravity is zero, and the mode of motion can not change.

Then if the size is different and the volume is the same, then buoyancy gravity or buoyancy gravity?

Buoyancy Gravity.

When an object floats on the surface of the water, or when it is at rest in the water (without sinking to the bottom).

Gravity generally refers to the gravity of an object.

When floating on the surface of the water, you can use f=g liquid; This is also equal to the gravitational force of the object.

When the object is in water (submerged in the bottom), you can use f=g.

f refers to buoyancy, right?

It is recommended to take a look at a few questions, which is difficult to explain.

I think C is the answer for that question.

Because the gravitational force of an object is less than the gravitational force of the water that it displaces when it is all in the water, the object floats. During the floating process of the object, the buoyancy is equal to the gravitational force of the water it dissipates, that is, 6n; The object will gradually float to the surface of the water, and the object is partially exposed to the water, so its buoyancy cannot be measured by the gravity of the water it dissipates. However, because it is stationary on the surface of the water, the buoyant force on which the object floats on the surface of the water is equal to the gravitational force of the object itself, according to the balance of forces.

If the gravitational force of the water is 4n when the object is completely submerged in the water, that is, it is less than its own gravity, then when the object is placed in the water, the object will sink to the bottom. Of course, if it sinks to the bottom, it cannot judge the amount of buoyancy it is subjected to.

Gravity refers to the force when an object is subjected to only one force, the force of gravity, that is, the mass of the object, which is generally weighed in air.

Levitation buoyancy = gravity.

Float buoyancy and gravity.

The principle of magnetic levitation.

Rotors, sensors, controllers, actuators.

The principle of a maglev train.

1.The principle of the maglev train is not profound. It is the use of magnets to "repel the same sex, and attract the opposite sex."

properties that give magnets the ability to defy gravity, ie.

Magnetic levitation. Scientists will.

Magnetic levitation. This principle.

It is used in the railway transportation system to make the train completely off the track and suspend it, becoming a "wheelless" train.

The speed can reach hundreds of kilometers or more. It's called.

Maglev train, also called.

Magnetic cushion car".