How to overcome the gravitational pull of the earth, how did humans overcome the gravitational pull

We are always trying to do everything we can to overcome the gravitational pull of the earth due to its own weight with various chemical and physical energy sources, it may be a misunderstanding, if flying saucers really exist, then gravity does not seem to work very well for their thin equipment, therefore, I think maybe we just think about how to overcome gravity from the direction of mechanics may be a mistake, we need to understand gravity as something else, I don't know if this idea is correct, but I believe that the way we understand gravity now is very simple. There may be another way.

Should try to find out!

To get off the ground, you have to overcome the gravitational pull of the earth.

But how can the Earth's gravity be overcome? This means that in order for an object to leave the earth, it must be applied in the opposite direction of the earth's gravitational pull (i.e., upward), so that it accelerates, and when it reaches a certain speed, it stops the afterburner, and it can move forward by inertia and leave the earth. This velocity can be calculated from the mass of the earth and the distance of the object from the center of the earth.

When an object flies over the surface of the earth (i.e., the distance is the radius of the earth), this velocity is kilometers and seconds, which is called the detachment velocity.

or escape velocity. It turns out that speed overcomes gravity.

When an object reaches a speed of one kilometer per second, it can break free from the gravitational pull of the Earth. In the process of getting rid of the shackles of the earth, under the action of the earth's gravity, it does not fly away from the earth in a straight line, but in a parabola.

Flight. After breaking away from the gravitational pull of the earth, it orbits the sun under the gravitational pull of the sun. To escape the gravitational pull of the sun and fly out of the solar system, an object must move at a speed of kilometers per second. At that time it will be pressed hyperbola.

The trajectory flies away from the Earth, and it will fly away from the Sun in a parabola relative to the Sun.

Kindness. The Earth's gravitational pull is the force of the Earth's magnetic field on the Earth's surface, and it is true that there is no device that can overcome the gravitational force, at least not yet.

Airplanes Spacecraft and other space tools mainly emit fuel at the tail to form a recoil, so as to achieve the effect of anti-gravity, but the gravitational force still exists. Airplanes can fly only because they are free from the shackles of gravity, but gravity is still there!

It is true that current science has not overcome this aspect!

Hope it helps! ~

When a spacecraft exceeds the first cosmic velocity and reaches the second cosmic velocity of kiloseconds, it will break away from the earth's gravitational field and enter the interplanetary space of the solar system.

When the body reaches a speed of kilometers and seconds, it can break free from the shackles of the earth's gravity. In the process of getting rid of the shackles of the earth, under the action of the earth's gravity, it does not fly away from the earth in a straight line, but flies in a parabola. After breaking away from the Earth's gravitational pull, it orbits the Sun under the action of the Sun's gravitational pull.

To escape the gravitational pull of the Sun and fly out of the solar system, an object must move at a speed of 1,000 seconds. It will then fly away from the Earth in a hyperbolic trajectory, and it will fly away from the Sun in a parabola relative to the Sun.

Human space activities are not just about escaping the earth. In particular, the current application spacecraft needs to fly around the Earth, that is, let the spacecraft move in a circle. We know that there must always be a force equal in magnitude to the centrifugal force and in the opposite direction acting on the spacecraft.

Here, we can take advantage of the gravitational pull of the Earth. This is because the gravitational pull of the earth on an object is exactly in the opposite direction of the centrifugal force in which the object moves in a curvilinear motion. It has been calculated that when the speed of motion of an object on the ground reaches a kilometer second, the centrifugal force generated by it is equal to the gravitational pull of the earth on it.

This velocity is known as the orbital velocity.

The speed at which the object moves in a circle around the earth is called the first cosmic velocity; The speed at which the earth flies away from the gravitational pull of the earth is called the second cosmic velocity; The speed at which the sun is free from the gravitational pull of the sun and flies out of the solar system is called the third cosmic velocity. According to the law of gravitation, the magnitude of the gravitational force between two objects is inversely proportional to the square of their distance. Therefore, the distance of an object from the center of the earth is different, and its orbital velocity (first cosmic velocity) and separation velocity (second cosmic velocity) have different values.

At the current level of theory and engineering, it is not feasible. Heavy element fusion is too inefficient, and if the earth is accelerated by heavy element fusion to provide energy, the mantle needs to be burned dry, and it needs to be assumed that the mantle still contains a lot of silicon and oxygen, not as little as it goes down. The tallest building that human technology can make now is just over a kilometer (Kingdom Tower, under construction), the length and width of the largest single building is 400 meters by 500 meters (Chengdu New Century Global Center), the largest steel structure building uses 10,000 tons of steel (Beijing New Airport Terminal), and the earth engine, a height of 11,000 kilometers, a diameter of more than 30 kilometers, and a weight of 100 million tons of giant buildings are fundamentally two concepts.

If you forcibly light up a black technology that "50% or more efficiency can be turned into trouser width", and only consume the earth's crust to generate enough energy to smooth out the energy generation problem, accelerating to the required thrust within 500 years will also allow the engine to drill into the ground on its own. Of course, if you can build a planetary engine with "more than 50% efficiency and mass conversion", then a black technology foundation that is powerful enough to act as a stiffener for the section can probably also be built.

Solar power plants will be built in one-tenth of the earth's land area. All of its electricity is used to power electromagnetic cannons that shoot into space. The speed of the shell is 50 kilometers per second.

The electromagnetic cannon reaction force pushes the earth, which is the planetary engine. In this way, the Earth would be pushed to orbit enough to take advantage of Jupiter's gravitational slingshot effect, and it would need to accelerate about 5 kilometers per second per second. It is about 35 kilometers per second at a maximum rotational speed.

This method will take a billion years. Various energy efficiency factors have been calculated.

In particular, before the construction of the earth engine base, the span was as high as dozens of kilometers, and the current technology of mankind has just solved the span problem of the kilometer-level bridge. During this period, the technological gap is even greater than that of human beings from nuclear technology to the technology of refusion engines......The fusion engine can still look at the shadow, after all, human technology has reached fission, fusion is also being developed, and even the uncontrollable nuclear fusion technology (i.e., hydrogen bomb) can be mastered.

The gravitational pull of the earth is the gravitational force that is naturally possessed due to the mass of the earth itself – the mass of the earth. Objects that are close to the Earth, without exception, are attracted towards the center of the Earth's mass. The earth itself is also accelerated by the attraction of the close object, but because it is much greater than the mass of the approaching object, the force of the approaching object on the earth is very small (the value tends to be close to zero).

Newton was the first scientist to discover the gravitational pull of the Earth.

Newton himself recalled that around 1666, when he was living in his hometown, he had already considered the question of gravity with oranges. One of the most famous is that Newton used to sit in the garden for a while during the holidays.

Once, as had happened many times before, an apple fell from a tree.

The accidental landing of an apple was a turning point in the history of human thought, which opened the mind of the man sitting in the garden and caused him to ponder what is it that makes all objects almost always attracted towards the center of the earth. Newton pondered.

Finally, he discovered the gravitational pull that was epoch-making for humanity. Newton's brilliance lies in the fact that he solved the problem of mathematical argumentation that Hooke and others were not able to solve. In 1679, Hooke wrote to Newton asking if he could prove that planets move in elliptical orbits based on the law of centripetal force and the law that gravity is inversely proportional to the square of the distance.

Newton didn't have this problem. In 1685, Harley visited Newton, who had discovered the law of gravitation: there is a gravitational force between two objects, and gravity is inversely proportional to the square of the distance, and directly proportional to the product of the mass of the two objects.

At that time, accurate data such as the radius of the earth and the distance between the sun and the earth were already available for calculation. Newton proved to Halley that the Earth's slow gravitational pull is the centripetal force that causes the Moon to move around the Earth, and that the planets move under the gravitational pull of the Sun in accordance with Kepler's three laws of motion. At Halley's urging, at the end of 1686, Newton wrote his epoch-making great work, The Mathematical Principles of Natural Philosophy.

The Royal Society was underfunded to produce the book, and with the help of Halle's funding, one of the greatest works in the history of science was published in 1687.

In this book, starting from the basic concepts of mechanics (mass, momentum, inertia, force) and the fundamental laws (the three laws of motion), Newton used the sharp mathematical tool of calculus invented by him to not only mathematically prove the law of universal gravitation, but also establish classical mechanics as a complete and rigorous system, unify the mechanics of heaven and the mechanics of objects on the ground, and realize the first major synthesis in the history of physics.

The gravitational phenomenon of the Earth manifests itself in two ways:

The first is the geocentric attraction phenomenon of the earth's magnetism, which can attract all kinds of objects from space and close to the earth's orbit through the magnetic means of opposite-sex attraction, so as to achieve the purpose of increasing the earth's mass, this gravitational phenomenon is called geocentric magnetic attraction.

The second is the phenomenon of the traction force of the huge magnetic field when the earth rotates, and at present, in the huge magnetic field of the earth, a relatively stable magnetic field coil has been formed for the moon to orbit around, and this gravitational phenomenon is called magnetic field magnetic traction.

Earth's gravitational force concretely forms the primordial.

Cause. If the Earth's surface is completely covered by free-flowing liquid water, then the surface of this liquid water appears as an oblate sphere, slightly flattened at the poles and expanded at the equator. This ideal shape, called the Earth Body, will perfectly balance with all the gravitational and rotational forces.

Newton's laws for the expression of gravity are the basis for gravity to follow.

As we all know, the basic formulation of this law is: the gravitational force between the two particles of M1 and M2 is proportional to the product of their masses, and inversely proportional to the square of the distance between the centers of these two particles, if F here is the force acting on M2, then R1 is the unit vector from M1 to M2, R is the distance between M1 and M2, and A is the gravitational constant of all things. The addition of a negative sign indicates that the forces are attracted to each other.

It is clear that gravity is the least intense interacting force that exists in nature. Recently, it has also been found that the value of a is not constant, but decreases slowly over time. This change is due to a number of reasons, one of which is believed to be due to the increase in the radius of the earth over time, which in turn will have a profound impact on the history of the earth's development.

However, the rate of change of the resulting a-value is so small that it has a rate of change of only about 1% over the course of the entire Earth's evolution, i.e., over billions of years, so it has little real value in practical applications.

Due to the existence of the huge mass of the earth (assumed m1), the acceleration produced by m2 is called gravitational acceleration. It was first measured by Galileo Galilei on the Leaning Tower of Pisa in Iwate. On the surface of the earth, this value is generally set at 980 centimeters and seconds2, and is often referred to as "gal" in honor of this great scientist.

The gravitational field is conserved, that is, in the gravitational field, the work done to move an object is independent of the path it travels, but only depends on its destination.

If you do not take into account air friction, and the hole is on the twigs"stuff"It is also a teasing situation without friction under the mountain lack of friends,"stuff"It should be centered on the center of the earth, with the surface of the earth on both sides as the boundary, and do a pendulum-like motion.