Why don t satellites fall ?

According to the principle of physics, when an object moves in a circle, a centrifugal force is generated, and the magnitude of this centrifugal force is proportional to the square of the rotational speed. Therefore, the greater the speed, the stronger the centrifugal force, when the centrifugal force and gravity are balanced, the object can rotate around the earth non-stop, so the flight speed of the artificial satellite must be large enough to balance the gravitational force, so that it can fly without stopping.

Among the commonly used satellite orbits, there is the so-called geosynchronous or sun-synchronous, which means that a certain parameter of the satellite orbit is the same as that of the earth or the sun. If the satellite orbits the Earth as fast as the Earth's rotation, the satellite does not move from the ground, and this satellite orbit is called a geosynchronous orbit. If the orbital surface of a satellite changes as fast as the Earth's revolution, the angle between the orbital plane of the satellite and the Sun is approximately unchanged, and this satellite orbit is called a sun-synchronous orbit.

Therefore, geosynchronous orbit is the pursuit of the earth by satellites; The sun-synchronous orbit is not a satellite chasing the sun, but an orbital plane chasing the sun. Communication satellites require satellite land chasing; Telemetry satellites require orbital planes to chase the sun, allowing the satellite to perform telemetry under the same sunlight.

How do artificial satellites break away from gravity and enter space orbit? In order for an artificial satellite to break away from gravity, it must use a rocket to fly into the sky at a speed of at least one kilometer per second (about 40,000 kilometers per hour), which is called the disengagement velocity. After the rocket separates the satellite from the satellite at a considerable height, the satellite uses the fuel it carries to propel into its final orbit.

Because there are many kinds of data on the role of force and gravity, just like a person jumping high on the earth, there will be a range, and the satellite has its trajectory.

The satellite moves in a circular motion around the Earth, and the centrifugal force generated is counteracted by the Earth's gravitational pull.

Because the satellite itself has power, it is doing lateral movement.

In fact, when the satellite is flying around the earth, it keeps falling down, and it is always in free fall. That's why it's weightless on satellites, spacecraft, and space stations that orbit the Earth. The reason why the satellite did not fall to the ground in the end was because the earth was round.

The lateral velocity of the satellite is very fast, reaching 7 km s, and it only takes 1 second for every 7 km it moves, while according to the free fall formula, this 1 second only drops 9 m.

Because the Earth is round, after the satellite moved 7 km laterally, the local ground also happened to drop by 9 m. The height of the satellite relative to the ground remains just the same. Moreover, the flight direction and flight speed at this time make the satellite's operating state relative to the earth almost exactly the same as the state 1 second ago, so the next 1 second is the same result, so the satellite will never fall to the ground.

The earth has gravity, so we don't fly out. When satellites are launched, their velocity will exceed the speed of breaking away from the Earth's gravity in order not to fall.

This is because the satellite needs a centrifugal force to rotate around the Earth, and the Earth's gravitational pull just cancels it out, so it won't fall. However, as the speed of the satellite continues to decrease, the child will eventually fall.

After the artificial satellite flies out of the atmosphere, it orbits the Earth, and the gravitational pull of the Earth can be pulled down.

Satellites that run out of fuel are called obsolete satellites, and such satellites will not be controlled by humans, and will be artificially guided to drop them into the Pacific satellite graveyard.

Generally, the following treatments are done when the fuel is exhausted:

1. Become space junk and fly freely;

2. Artificially guided to a safe track;

3. Artificially guided fall into the Pacific Ocean (satellite graves);

4. Free fall.

The role of satellites:

Natural satellites are naturally formed in the universe, and it is difficult to say what they do. Of course, the moon is the natural satellite of the earth, it can balance the rotation of the earth, stabilize the earth's axis, control the tides, can be used to observe time, etc., and can also imagine many beautiful legends.

Artificial satellites are widely used, some are equipped with photographic equipment, and are used to take pictures of the ground, reconnoitre, investigate resources, monitor the earth's climate and pollution, etc.;

Some are equipped with astronomical observation equipment for astronomical observations; Some are equipped with communication relay equipment, which are used to relay radio, television, data communication, ** and other communication signals; Some are equipped with scientific research equipment, which can be used for scientific research and special production under the condition of no gravity in space.