Newton's laws of motion are independent of each other, and their internal logic is consistent. Its application scope is classical mechanics, and its application conditions are particle, inertial reference system and macroscopic and low-speed motion problems. Newton's laws of motion explain the complete system of Newtonian mechanics and the basic laws of motion in classical mechanics, which are widely used in various fields.

Newton's laws of motion are only applicable to macroscopic problems. When the motion linearity of the object under investigation can be compared with the de Broglie wave of the object, it can be known from the uncertainty relation of particle motion that the momentum and position of the object cannot be accurately known at the same time, so Newton's dynamic equation cannot be solved because of the lack of accurate initial conditions.

In other words, the classical description method has failed, or it needs to be modified because of the uncertainty of particle motion. For the action amount close to or less than Planck constant h=6.6× 10? J s particles (or the linearity α= 10 close to or less than the atomic linearity? M objects), quantum mechanics must be used.

He described gravity and three laws of motion in the paper "Laws of Nature" published by 1687. These descriptions laid the scientific view of the physical world in the next three centuries and became the basis of modern engineering. By demonstrating the consistency between Kepler's law of planetary motion and his theory of gravity, he showed that the movements of ground objects and celestial bodies all follow the same natural law; It provides strong theoretical support for the sun-centered theory and promotes the scientific revolution.