Why objects are able to fly in orbit in space so firmly

There is kinetic energy, which is the force when an object is launched into space!

Objects have three cosmic velocities, and you should know that the first velocity can make an object revolve around the earth.

Because the object revolves around the earth, and the earth has a gravitational pull, downward, the object also has a forward momentum, so the decomposition of the force appears as a centripetal force! So the object rotates! And since there is almost no resistance in the universe, a very small thrust can make the object move forward, so the solar panel can provide enough thrust, and the gravitational force is there all the time, so the centripetal force will always be there, the object will always turn, and if you don't want a satellite one day, just turn off the panel, and it will fall by itself!

When an object enters space at the second cosmic velocity, it will fly around the planet at a fixed speed without the support of power, because the centrifugal force and gravitational force at this time are equal, and the object is weightless and balanced, and the velocity remains unchanged.

Space is almost vacuum, and this is because of the way to another place, attracted by gravity.

Because there is no drag in space, when the centrifugal force of an object is equal to the gravitational force of the earth, it flies steadily!

The centripetal force generated by gravity causes an object to revolve steadily around the Earth (or other planets).

The first cosmic velocity is kilometers per second, and reaching or exceeding this velocity allows objects to leave the Earth's surface and orbit the Earth. The orbital radius and eccentricity depend on the initial velocity. Less than this velocity, the object will be pulled back to the ground by the Earth's gravitational field.

The second cosmic velocity is kilometers per second, and reaching or exceeding this speed can cause an object to break away from the Earth's gravitational field and become an artificial planet orbiting the Sun or a vehicle flying within the solar system.

The third cosmic velocity is kilometers per second, and when it reaches or exceeds this velocity, the object will eventually break away from the sun's gravitational field and fly towards other stars in the vast universe.

If you are wondering whether the Shenzhou spacecraft and the objects in it have velocity and gravity in space, then the answer is: there is velocity, there is gravity.

Shenzhou spacecraft and satellites, including the International Space Station, orbit the Earth. As on the ground, it is still subject to the Earth's gravity, and the magnitude of gravity is only slightly smaller than that of the ground.

At the same time, the spacecraft is also moving at a very fast speed, with a speed of several kilometers and seconds.

The so-called weightlessness does not mean that the spacecraft is not affected by gravity, but that the spacecraft has been pulled by gravity and falls to the ground. So why didn't the spaceship fall? The reason is that the earth is a sphere, and the spacecraft is very fast, and it has not yet fallen, but has already run to the other side of the sphere, so it always cannot fall.

There will also be resistance.

The gravitational chain between the planets is wide and repulsive, which is the Newton mentioned above.

The gravitational pull possessed by the discovered object.

The greater the mass, the greater the gravitational pull, and the gravitational pull of a star like the Sun causes the planets of the solar system.

around it. Therefore, in the shed, the space will also be affected by the force bending pins of various planets.

There are various dust materials floating in space, and when they move in space, they will rub against these dusts, so they will also generate resistance.

Space orbits are virtual, just trajectories of object motion.

This trajectory is related to the speed of the object's motion.

First cosmic velocity.

It's the speed at which you can go to the sky, and if you don't have this speed, you can't go up. When you go up and do the orbit, because the gravitational force there is smaller than the ground, you don't need that much speed to maintain the orbit, so in the case of orbiting, it is less than that. The orbit of the spacecraft will be offset, but it will still orbit the Earth if it is less than, that is, less than the speed of the second universe, but the orbit will change with the speed.

Only if it is exceeded, the flying Bixiao ship will no longer surround it, and it will be separated from the earth. But to the moon.

Considering the gravitational pull of the Moon, the velocity would be 10 848 km/s.

A space orbit is the route of a spacecraft orbiting a planet!

The track, in fact, is abstract and has no physical object! Generally, it is based on the trajectory mode of the object!

In the case of the Earth, if the object is free from the gravitational pull of the Earth's missing sphere. Then the object will revolve around the Earth! If the object's velocity is greater, then it will rotate to another orbit! So, speed is the factor that determines the orbit!

When liftoff, 1To recoil, the sail-closing force of recoil gives the rocket tremendous speed; 2.To accelerate, the speed is increasing to get rid of the gravitational pull of the earth.

into space; 3.To overcome overweight, astronaut Bei Tong has to bear a large overweight load during the take-off stage of the fire mimic tan arrow, and must be absolutely healthy and trained; 4.To insulate and insulate, the faster the speed is to rub against the air, the more heat will be generated, and the overheating needs to be solved.

5.To reduce the weight, the rocket is staged, and the stage is shedding one stage at a time, just to reduce the weight.

After going into space, 1To overcome complete weightlessness.

It must be trained to work and live normally, especially after total weightlessness, water and food lose their gravity and cannot automatically flow into the astronaut's mouth. 2.To overcome no pressure, outer space.

It is a vacuum, which must be pressurized in the space chamber in order to be suitable for survival, and oxygen must also be generated. 3.To overcome the communication problem, it is necessary to maintain contact with the earth.

Overcoming gravity, atmospheric friction, reaction force, atmospheric pressure, energy, equilibrium force, acceleration, centripetal force, centrifugal force, universal gravitational force, communication of the ionosphere, reflection, scattering, electricity of blind communication equipment

Do (elliptical) garden motion, take the center of the earth as the grinding notice, and the first cosmic velocity is.

Weightlessness, many problems of life, communication, sudden loss of pressure on the leg bones,

When lift-off, when jet-hitting.

The principle of strong relativity.

When entering space from Earth.

The circumference is far away from the problem of too much rolling in imitation of the manual aspect.

Centripetal Qin has some spare strength.

To break through the second speed of the universe.

In short, it is Newton's three laws.

Everything that is specific evolves through it.

It's a big deal.

In the deserted space, it is very difficult for a spacecraft to maintain a certain "posture", operate in a certain orbit, or "fix" in a certain position in space. There is no "wind" blowing in space, and there is no "man" to push, so why would the spacecraft "desert" on its own? In fact, due to the uneven gravitational pull in space, the residual atmosphere and the collision of tiny particles in space, the spacecraft will be in an unstable state.

Space orbits are virtual, just trajectories of object motion.

This trajectory is related to the speed of the object's motion.

The first cosmic speed is the speed at which you can go to the sky, and without this speed, you can't go up. When you go up and do an orbital motion, because the gravitational force there is less than the ground, you don't need that much speed to maintain the orbit, so in the case of orbiting, it should be less. The orbit of the spacecraft will be offset, but if it is less than, that is, less than the second cosmic velocity, it will still orbit the Earth, but the orbit of the orbit will change with the speed.

Only if it is exceeded, then the spaceship will no longer orbit and will break away from the earth. But to get to the Moon, considering the Moon's gravitational pull, the speed would be 10 848 km/s.

A space orbit is the route of a spacecraft orbiting a planet!

The track, in fact, is abstract and has no physical object! Generally, it is determined according to the trajectory mode of the object!

In the case of the Earth, if the object is free from the gravitational pull of the Earth. Then the object will revolve around the Earth! If the object's velocity is greater, it will rotate in another orbit! So, speed is the factor that determines the orbit!

Indeed, as the "scorching francium hydroxide" said, the satellite relies on the rocket engine when it is launched, but before the satellite leaves the rocket, the rocket again gives the satellite the final speed adjustment according to the requirements and adjusts the attitude or spin according to the requirements of the satellite, and then it is all up to the satellite itself. Satellites often carry their own chemical rockets, called orbital engines and attitude control engines, of course, there are also those that do not come with them, and they are not needed to fly for a few days after launching, and wait for them to crash on their own. Our common low-orbit and low-mass satellites generally have relatively small orbit engine thrust, while high-orbit, high-quality satellites have relatively large thrust.

There are also those that are not chemical rockets, but just a gas tank, similar to the kind we inflate lighters, and put some gas to correct the trajectory and attitude. This is all determined based on the satellite's mission, mass, etc. The nozzles of the attitude control engine are not released in only one direction like the orbital engine, but are distributed in multiple positions of the satellite according to the shape of the satellite and the orbital attitude.

For example, the Fengyun-2 meteorological satellite is a cylinder and spins around its axis. When detaching from the rocket, the rocket gives it an initial rotation, but this rotation is easy to be unstable, commonly known as "tension", which requires the satellite attitude control engine to correct in time to ensure the pointing and rotation speed of the satellite, otherwise it may change the rotation characteristics due to excessive "tension". You can imagine a tall, thin spinning top standing on a table, spinning and turning, unstable, and falling down.

This kind of engine needs to be jetted with working fluid, that is, the so-called "working fluid engine" (said in the three-body problem), once the working fluid is consumed, the satellite can only ask for more blessings, the orbit and attitude can not be maintained, and finally become a waste star, which is an important determinant of the life of the satellite. But there is a new way, a non-working track maintenance system, and that is the use of electromagnetic fields. There is a shortage of working fluid on the satellite, but there is no shortage of electricity.

Build a large electromagnet on the satellite and use the repulsive force of the Earth's magnetic field to maintain the satellite's orbit. Although the repulsive force generated by the earth's magnetic field on the satellite is very small, it may only be a few grams, or even so small that it is almost negligible, but it can have a long-term effect, and the orbit of the satellite is also a very slow process, as long as it continues to have an effect, it can play a role in maintaining the orbit and attitude of the satellite. Taking China's Fengyun 1 and Fengyun 3 series satellites as an example, this technology is adopted, and the in-orbit time is greatly extended, which is only limited by the life and processing technology of the devices used in the satellite.

Actually, I've always been against some of the way books describe it.

Most people will tell you: from elliptical orbit to uniform small orbit.

Decelerate, from elliptical orbit to larger orbit to be.

Hasten. In fact, we should say: from an elliptical orbit to a uniform small orbit.

Provides an acceleration that is the opposite of velocity.

But the speed became larger), from an elliptical orbit to a larger orbit to.

Provides an acceleration in the same direction as velocity.

But the speed has decreased).

That's what to say. Force.

Or. Acceleration.

problems, not speed. The first statement is clearly misleading for most beginners.