Gravitation? How does gravity come about? What is Gravitational Force?

Space-time exists objectively, and when a substance is put into a space-time, it will have an effect on the entire space-time, because it occupies a piece of space-time.

And space-time will have an effect on this matter, and this effect we will explain it by the concept of "force".

The above answer is based on the philosophical primacy of matter, and if the primacy of matter is true, the proposition is proved.

The following is my own understanding of the role of space-time on matter, and I welcome your guidance. The existence of space-time itself is stable, and when matter enters space-time, the matter occupies a certain space-time, which negates the space-time that already exists. In order to maintain its own existence, space-time needs to negate matter and expel matter out of space-time.

In this way, there is an effect between them.

If we don't put matter into space-time, then there is no matter, neither we humans nor our minds. If there is no thinking, there is no knowledge of matter, and propositions are meaningless.

So the discussion is only meaningful if there is matter in space-time.

If you plan to write a graduate student, you can take a look, I explained it to you from a philosophical point of view. Of course, whoever can prove my ideas with experiments, then I thank him. The understanding of the meaning of human existence can be further enhanced.

Isn't it gravity?

The gravitational pull of the Earth's core is the greatest.

There is also gravitational attraction in the air. The law of gravitation, there is a gravitational force between any two objects. People in space are weightless.

Gravitational pull

A law of interaction between objects, discovered by Newton in 1687. Any object has a mutual attraction to each other, and the magnitude of this force is directly proportional to the mass of the individual objects and inversely proportional to the square of the distance between them. The law of gravitation was first proposed by Newton in his book The Mathematical Principles of Natural Philosophy, published in 1687.

Newton used the law of gravitation to explain not only the laws of planetary motion, but also pointed out that the moons of Jupiter and Saturn orbit the planets in the same way. He believed that the moon was subject to the gravitational pull of the sun in addition to the gravitational pull of the earth, thus explaining the di-homogeneity, business trips, etc., which had long been discovered in the movement of the moon.

In addition, he explained the orbits of comets and the tidal phenomena on Earth. According to the law of gravitation, Neptune was successfully predicted and discovered.

After the law of gravitation appeared, the study of the motion of celestial bodies was formally based on the theory of mechanics, thus creating celestial mechanics. To put it simply, the more massive something is, the greater the gravitational force, and the gravitational force generated by the mass of the earth is enough to grasp everything on the earth.

Any two particles are attracted to each other by a force in the direction of the concentric line. The magnitude of this gravitational force is directly proportional to the product of their masses and inversely proportional to the square of their distance, independent of the chemical nature or physical state of the two objects and the intermediary matter.

Different interpretations. Gravitational force is considered one of the fundamental forces in the universe in classical physics, and is directly proportional to mass and inversely proportional to the square of distance. But in Einstein's theory, gravity is no longer a fundamental force, but only a manifestation of the bending of the structure of space-time.

The reason for the bending of the structure of space-time is the huge mass.

To give an example, the planets in the solar system orbit the sun, which is explained in classical physics because the planets are driven by the sun's gravitational attraction and orbit the sun.

According to the theory of general relativity, the space-time around the sun is affected by the huge mass of the sun, forming a space-time bend, while the planets move according to their geodesics.

The above content reference: Encyclopedia - Gravitation

Gravitational attraction is the attraction of an object to an object. Due to the attraction of the earth to the object, the force experienced is called gravity.

The gravitational force exerted on an object with a mass of 1 kilogram is Newton, whereas the gravitational force experienced by an object with a mass of 2 kilograms is Newton. We use the letter g to represent the ratio of gravity to mass of an object, then g = g m = Newton kilogram, which is an infinite non-cyclic decimal. According to the relationship between gravity and mass, we can derive the formula for calculating gravity, which is:

g=mg。The direction of gravity is vertically downward, and the vertical direction we speak of is actually determined by the direction of gravity.

All parts of the object are subject to gravity, but gravity has a point of action called the center of gravity, for example, the center of gravity of a parallelogram with uniform mass is at the intersection of its diagonal lines, the center of gravity of a triangle with uniform mass is at the intersection of its three midlines, and the center of gravity of a sphere with uniform mass is at the center of its sphere.

Gravity, together with the electromagnetic, weak and strong interaction forces, constitute the four basic interactions in nature. Of the four fundamental interactions, gravity is the weakest, but at the same time it is a long-range effective force. In modern physics, the phenomenon of gravitational attraction is generally described precisely by the general theory of relativity, which considers gravity to reflect the inertia of an object in curved space-time.

Newton's law of universal gravitation in classical mechanics is an excellent approximation of gravity under ordinary physical conditions.

On Earth, the gravitational pull of the earth on an object near the ground gives weight to the object and causes the object to fall towards the ground. In the universe, gravity causes matter to gather to form celestial bodies, and at the same time, celestial bodies attract each other to form a celestial system that orbits.

Gravitational attraction refers to a kind of attraction between objects, the greater the mass of the object, the stronger the gravitational force it exerts on other objects, Newton's law of universal gravitation can describe this phenomenon well. According to Newton's theory of gravitation, the gravitational force between objects is directly proportional to the product of their masses and inversely proportional to the square of their distance from their center of mass.

Newton used the law of gravitation in his classical mechanics system to describe the gravitational effect between objects, and the peculiarity of this interaction is that it is only related to the mass of the object and the distance between objects. In the law of gravitation, gravity is described as a point-to-point interaction between any two objects with mass in space (see gravitational force). In fact, gravity is not a substantial attraction interaction force between two objects, but the influence of the physical properties of one object on the motion of another object, and this physical property is also a physical quantity, which can be described and described by quantitative theory, which is the gravitational field theory.