Newton's First law of Motion

Newton's first law of motion, referred to as Newton's first law. Also known as the law of inertia and the law of inertia. A common and complete statement: any object must keep moving in a straight line or at rest at a constant speed until an external force forces it to change its state of motion.

1687, the British physicist isaac newton put forward Newton's laws of motion in his masterpiece Mathematical Principles of Natural Philosophy, and Newton's first law of motion was one of them. Newton's first law and Newton's second and third laws constitute a complete system of Newtonian mechanics.

Second, Pauli exclusion principle.

Pauli exclusion principle, also known as Pauli principle and exclusion principle, is one of the basic laws of microscopic particle motion. It is pointed out that two or more particles cannot be in the same state in Fermi subsystem. It takes four quantum numbers to completely determine the state of an electron in an atom.

Therefore, the Pauli exclusion principle is manifested in atoms: no two or more electrons can have exactly the same four quantum numbers, or at most two electrons can be accommodated in an atomic orbit determined by orbital quantum numbers M, L, n L and N, and the spin directions of these two electrons must be opposite. This has become one of the criteria to explain the periodic table of elements, and periodicity is formed by arranging electrons outside the nucleus.

Third, the uncertainty principle

The uncertainty principle was put forward by Heisenberg in 1927. This theory means that you can't know the position and velocity of a particle at the same time, and the uncertainty of the particle position must be greater than or equal to Planck's constant, which shows that the particle behavior in the microscopic world is very different from that in the macroscopic matter.

In addition, the uncertainty principle involves many profound philosophical problems. In Heisenberg's own words: "In the statement of causality, that is,' If you know exactly the present, you can foresee the future', the conclusion is not a conclusion, but a premise. It is impossible to know all the details now. This is a matter of principle. "

Fourth, the law of universal gravitation.

The law of universal gravitation was published by isaac newton in Mathematical Principles of Natural Philosophy on 1687. Newton's law of universal gravitation is expressed as follows: any two particles attract each other through the force in the direction of the connecting line. This gravity is directly proportional to the product of their masses and inversely proportional to the square of their distance, and has nothing to do with the chemical composition of two objects and the type of medium between them.

Inertia theorem of verb (abbreviation of verb)

The law of inertia is Newton's first law (Newton's law)

The first law, or law

Inertia), which was discovered by Newton. Inertia theorem: all objects are always in a state of static or uniform linear motion when there is no external force.

That is, when all objects are not stressed, the state of motion will not change, the stationary object will always remain in a static state, and the moving object will always maintain a uniform linear motion state. The characteristic that an object maintains a constant state of motion is called inertia.

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