1. All kinds of elements proced by the burning of the sun's core are thrown into space by the sun and become thin and cold nebulae; Under the action of gravity, these thin nebulae begin to shrink into spherical like shapes; The nebula sphere self compresses and generates huge heat energy to form a high-temperature gas-liquid mixture, which prevents the gravity from causing the sphere to collapse into a black hole. This stage is linked with the equation of state of gas in the middle school; The high temperature compresses the nebula sphere, releases heat energy to the outer space to cool, solidifies and crystallizes into surface magmatic rocks; Because the surface magmatic rock is thin, the volume shrinks after cooling, forming the original large turtle crack, commonly known as the fault; Because of the existence of the earliest faults, the magma will form a volcanic eruption landscape under high temperature and pressure, and intrude into the turtle cracks to re suture and orogeny between the surface plates
2. Newton did not discover gravity. He discovered that gravity is everything. Every object will attract other objects, and the magnitude of this attraction is only related to the mass of objects and the distance between objects. Newton's law of universal gravitation states that every object attracts every other object, and the gravitation between the two objects is proportional to their mass, and decreases with the square of the distance between the centers of the two objects. Newton developed calculus in order to prove that only a spherical body can concentrate the total mass of the ball to the center of mass of the ball to represent the total effect of the gravitational action of the whole ball. However, no matter how far away from the earth, the earth's gravity will never become zero. Even if you are brought to the edge of the universe, the earth's gravity will still act on you. Although the effect of the earth's gravity may be covered by massive objects near you, it still exists. No matter how small or how far away, every object will be subject to the action of gravity, and spread all over the space, as we call "everything.".
3. Without gravity, you would not be standing on the earth, the earth would not revolve around the sun, satellites would fly out of control, electrons inside atoms would not revolve around the nucleus, atoms would disintegrate, objects would not form compounds and so on, all mechanical procts would be paralyzed, because the coupling between components would be affected, without gravity, your pen would be broken There will be no more rain and snow in the world... Our life without gravity will be a mess
4. What is the function of gravitation< The role of gravity is too big
the role of gravity is to maintain the stable operation of the current cosmic galaxies
without gravity, everything you see now doesn't exist.
5. Because the gravity of the earth is not so great, and after so long evolution, people have long adapted to the gravity of the earth. If you say that kind of gravitation, people are likely to be sucked to death, unless it happens to be within the range of death and walking
6. The discovery of the law of universal gravitation is one of the greatest achievements of Natural Science in the 17th century. It unifies the law of motion of objects on the ground with that of celestial bodies, and has a far-reaching influence on the development of physics and astronomy in the future, The law of universal gravitation reveals the law of celestial motion, and has a wide range of applications in astronomy and Astronautics. It provides a set of calculation methods for actual astronomical observation, and can calculate the long-period orbit of celestial motion with only a few observation data. In the history of science, Comet Halley, Neptune, Neptune, etc The discovery of Pluto is an example of great achievements made by applying the law of universal gravitation. Using the formula of universal gravitation, Kepler's third law and so on, we can also calculate the mass of the sun, the earth and other celestial bodies that cannot be directly measured. Newton also explained the tidal phenomenon caused by the gravity of the moon and the sun, The reason why the earth's poles are flat and the complex movement of the earth's axis are successfully explained
7. With the help of this system, people can study virtually all macroscopic mechanical systems, from the penlum swing to the planets' orbit around the sun, and can also predict their states. Newton not only expounded these laws of mechanics, but also demonstrated how to apply these basic laws to solve practical problems by using calculus and other mathematical tools
8. Let mankind understand that there is gravity between all things in the universe, people can find new stars through the calculation formula of gravity, and calculate the motion properties of new stars, such as period, orbit and so on. That's all I know for the time being~~~~~~~~~
9. The application of the law of universal gravitation
1. Dece the first cosmic velocity.
2. Dece the second cosmic velocity according to the concept of energy.
3. Understand the launch principle of the far earth circular orbit satellite and explain the return process of the recoverable satellite.
4. Introce the equivalent principle of general relativity and establish the concept of acceleration field.
5. Establish the concept of tidal force, Explain the cause of tidal phenomena.
6. Establish idealized model, equivalent method, analogy method, control variables and other physical methods.
7, estimate the mass and density of celestial bodies.
8, discover and study the operation law of celestial bodies.
9, develop artificial satellite
