Why is there gravity on the earth and why is there gravity on the earth

Because the vertical stability of the earth's gravity is generally recognized in our daily life, the earth's natural force, that is, the earth's gravity, is commonly known as the "earth's fixed gravity" (also to distinguish particle microgravity). The theory of studying the meaning, function, laws and characteristics of "the earth's natural force, that is, the earth's fixed gravity", is the "earth's fixed gravity", referred to as "the earth's gravity", which is the earth's natural force generated by the earth's material mass as a whole, that is, the earth's gravity, which occurs in and to the center of the sphere, also known as the spherical gravity. The natural force of the earth, that is, the energy of the earth's body (earth) and the earth's outer space (sky) reached by the earth's gravitational force, condenses in the direction of the earth's core, and this cohesion is carried out in a vertical downward way to stabilize the energy of the things it reaches.

The natural force of the earth, that is, the definite gravitational force of the earth defeats the extraterrestrial gravitational force (mainly the gravitational force of the sun), so that the energy of the earth and all its things (including the air in the outer space of the earth) can continue to exist, so the "natural force of the earth, that is, the gravitational force of the earth" is the common vitality of the earth and all its things, and its physical and mechanical laws are the basic laws of the existence and interests of the earth and all its things. Due to the constant internal movement of the unified probability of the earth's natural forces in the earth's energy whole, so that the earth's energy as a whole has energy metabolism, activity, organic, information transmission and intelligent ecological organisms, so the great earth is also called [ecological earth]. The natural forces of the earth are the great ecological energy, which is the condition for making the great earth energy as a whole [ecological earth], and the law of energy benefits of the earth's natural forces is the basic law of energy benefits of the [ecological earth] of the [ecological earth].

The natural forces of the earth are the natural forces of the earth, that is, the gravitational mechanics of the earth", is a theoretical theory that studies the basic laws of the existence and interests of life in the great [ecological earth] and all its creatures, mainly including the following contents: The ecological nature, characteristics, functions, and interests of the earth's energy as a whole. The law of existence and interests of all things on earth.

The natural force of the earth, i.e., the difference between the gravitational force of the earth and the gravitational force of particles. Earth's relationship to other planets. The relationship between the earth's matter and energy.

The common law of the universe. The law of existence and interests of life. The relationship between the way of life and the concept of survival and the interests of the earth.

The natural force of the earth is the embodiment of the earth's gravitational force in life, and the relationship between the interests of life and the earth's natural force, that is, the earth's gravitational force. Analysis of the role, impact, sequence, relocation and consequences of the earth's natural force, that is, the earth's gravitational force in human society. The natural forces of the earth are the "earth ecology", "life science of the earth" and the concept of ecological and environmental protection in the gravitational mechanics of the earth.

The natural forces of the earth, that is, the energy, causality of the fixed gravity of the earth, etc.

There is a gravitational force f=gmm r 2 between any two massed objects

A gravitational field is present around all objects with mass.

Without gravity, the Earth itself would be unsustainable!

There is a gravitational force between objects, depending on the size of the object, the larger the gravitational force between the substances, it is a resultant force, a superposition of forces, matter is made up of the smallest particles, there is a gravitational force between the smallest particles, there is a gravitational force between one smallest particle and all the other smallest particles, imagine how many forces must be combined. A particle on the surface of the earth, attracted by all the particles of the whole earth, is pulled towards the earth, and as a result, all the particles are pulled towards the center of the earth. There's so much to learn here.

I can't understand it for a while, but the general direction is like this.

Because of rotation, rotation generates a centripetal force, and this heart is the center of the earth, the core of the earth. The Earth's autobiographical linear velocity is 466m s, and the reason why we can't feel it is because she's so huge.

According to classical physics, as long as there is mass, gravity will be generated.

Using Newton's law of gravitation, the magnitude of gravitational force between two objects can be accurately calculated. But why there is gravitational force, Newton can't say.

It wasn't until Einstein came up with a general theory of relativity that he figured out the ** of gravity. Albert Einstein said that all masses cause space to deform, just like putting an iron ball on a taut sheet, the iron ball will sink, and the objects located in this sunken area will move in the center of the sunken area until it collides with the iron ball. Planets in the universe can also "sink" the space around them.

So Einstein said that there is no such force as gravity at all, there is only the deformation of space. The motion of an object under the gravitational pull is simply its motion in the deformed space.

Because there will be a gravitational force between any object with mass, that is, gravitational force, the magnitude of gravity depends on the mass of the matter, the greater the mass, the greater the gravitational force, so the huge material of the earth can attract all the objects on the earth whose mass is much smaller than the earth. This is the gravitational pull on Earth.

In the same way, the Earth is attracted by the Sun, a star much more massive than it, and its irregular circular motion (i.e., the Earth revolves around the Sun) is also due to the gravitational pull, which is the centripetal force of the Earth revolving around the Sun.

In 1665, the famous physicist Isaac Newton discovered the law of universal gravitation. This proves that gravity and matter coexist, and where there is matter, there is gravity. It is not only the earth that has gravity, but all matter has gravity between them. So, why does the Earth have a gravitational pull?

From the perspective of the formation of the earth, the earth is under the action of gravity, through the attraction of material particles to each other, continuous condensation, accumulation and evolution, so from this point of view, the earth also originated by gravity.

From the perspective of the earth's own characteristics, the earth is a sphere with magnetic force, so the center of the earth will naturally produce a huge gravitational force, which firmly attracts all the materials on the earth.

From the point of view of the law of the earth's motion, in the process of the earth's rotation around the earth's axis and the sun's revolution, due to the interaction between the earth itself and the earth and the sun, the earth has a gravitational force, which can compete with the sun's gravitational force, so that the earth will not be attracted by the sun's strong gravitational attraction and "go the wrong way".

Gravitation also exists between matter that is considered matter and antimatter, and is universal everywhere except for a slight modification of Newton's theory of universal gravitation proposed by Einstein's theory of general relativity.