Is the motion of a small meteorite after entering the atmosphere a free fall?

No, free fall is when an object falls from a height at a velocity of 0 at an initial velocity of 0 under the action of gravity alone (i.e. without resistance). Obviously, small meteorites burn up when they enter the atmosphere, which is the result of friction with the air to generate heat. Moreover, the reason why the small meteorite enters the atmosphere is because of the gravitational pull of the earth, which means that it has a certain speed before entering the atmosphere.

This does not match the conditions of free fall, so it is not a free fall sport.

In fact, resistance is ubiquitous, so it is impossible to have a free fall movement, which is just an "ideal state" proposed by scientists for research. It's impossible to achieve. However, the theory of free fall motion is absolutely correct.

No. Because the atmosphere is relatively dense, the asteroid will accelerate in the initial stage, but it is not a free fall motion, and the asteroid will be subjected to great atmospheric drag after entering the atmosphere, generating a lot of heat and emitting light, and the asteroid is actually doing deceleration motion, not free fall motion.

No, the acceleration of a free fall is the acceleration of gravity.

That is, the object is only affected by gravity.

When a meteorite enters the atmosphere, it is also subject to the frictional resistance of the air, so it is not in free fall.

No, because there is air resistance, and the direction of its movement is not in a vertical line, it is always at a certain angle to the ground.

Free Fall Definition: "The motion of an object falling from rest only under the influence of gravity is called free fall motion".

So it's not.

Obviously not, the air resistance is too great, and when the small meteorite reaches a certain speed, it is moving at a uniform speed......

Anyone with a little knowledge of physics will know, no.

The reason why a meteorite disintegrates in the atmosphere is that the front of the meteorite is subjected to a lot of air pressure, and the rear is in a vacuum, and it collapses and disintegrates under the action of pressure difference.

In addition, the loading speed of the ICBM is about 7000 meters per second. Meteorites generally have a time of 20 to 40 km/s, which is 3.6 times that of ICBMs, and the slowest meteorites are more than 10 km/s, which is twice that of ICBMs. It is important to know that aerodynamic force is directly proportional to the square of velocity.

Secondly, meteorites are divided into stony meteorites and iron meteorites, with stony meteorites disintegrating more easily, while iron meteorites are stronger. But even iron meteorites, after all, are naturally formed, and they cannot have a uniform texture, and they may be mixed with rock or ice, and they will decompose when forced. And the nuclear warhead is obviously shelled with high-strength alloys, which are much stronger than meteorites.

Everyone knows that the shape of meteorites is irregular. But ICBMs are specifically designed to pass through the atmosphere, are generally very sharp cone-shaped, have little air resistance, and have ablative materials attached to the surface, which can take away a lot of heat.

Falling into the atmosphere, mainly air resistance and friction.

Friction makes the meteorite smaller, while frictional heat generates high temperature that melts the meteorite, and air resistance causes it to disintegrate and differentiate.

It's not that it's disintegrating, it's getting smaller and smaller because of atmospheric friction.

On February 15, the speed of the meteorite in Russia reached more than 50 times the speed of sound, and such a high speed will not only make the pressure of the meteorite and air convection less than that of other places. And the air in the front has no time to dodge, so that the air in front is getting denser and denser, and when it reaches a limit, it will make the energy of the meteorite hit the air reach the limit of ** in an instant. This means that when a meteorite falls in front of the ground, it is not that some will disintegrate, but that a slightly larger meteorite will disintegrate.

Therefore, the slightly larger meteorites found are irregular, or have horns. Otherwise, the shape produced by atmospheric friction or combustion should be left.

Friction with atmospheric air.

When meteorites fall to the ground, they are very fast, and when they pass through the dense atmosphere of the earth, they will violently rub against the atmosphere and generate heat. A meteorite with a small size burns up in the atmosphere, and only a meteorite of a large enough volume can pass through the atmosphere and fall to the ground.

The closer you get to the ground, the denser the atmosphere becomes, and the higher the atmosphere is, much thinner. "Meteorites do not burn up close to the ground" is not true, but meteorites that can fall close to the ground are large enough in themselves to not be burned out in the atmosphere.

There are two reasons: 1) small meteorites because of their small heat capacity, which can easily cause small meteorites to burn, while large meteorites may not even reach the ignition point even close to the ground, even if large meteorites reach the ignition point, they will burn later than small meteorites, or the ignition time of small meteorites is early, and the ignition time of large meteorites is late; 2) Small meteorites burn for a short time like matches, and large meteorites burn for a long time like lighters.

Meteorites pass through the atmosphere on the Earth's surface as they fall to the ground. The closer you get to the ground, the denser the atmosphere becomes. Meteorites fall in the atmosphere at a very fast speed, and are bound to heat up and burn. There are still some left of the large ones, and the small ones are burned out.

It burned up as it passed through the atmosphere.

The small meteorite burned out, and the big meteorite can still burn some left, which is simple and easy to understand.

Crater. It is commonly found in meteorites with large volumes. Since there is no air in the universe and there is no friction, the planets in the universe are moving at extremely high speeds, often hitting other planets and leaving deep impact craters.

Radiation. The presence of cosmic rays and other elements that are not found on Earth in the universe can be detected by technical means.

Scorch marks. Before a meteorite falls to Earth, it rubs violently in the atmosphere, and its surface is scorched.

There is nothing in space, and the most noticeable change comes from the meteor experience, where the violent friction causes the surface to form a molten crust.