Reflection of Classic Mechanics:Several Different Basic Assumptions

Several basic assumptions of classical mechanics were discussed in detail and different assumptions were brought forward.These assumptions are as following: uniform rectilinear motion doesn't exist,uniform circular motion of particle revolving centroid axis is inertia motion,coordinate system based on such centroid axis and motion is unique inertia reference system;Newton's second law reflects force between two objects with huge different weights which has logical conflicts with the definition of force and needs to be revised;inertia force is an acting force which needs to meet Newton's third law;concept of mass should be matter's contents and mass has relativity;so-called gravitational constant G is not a generally applicable constant,and gravitational coefficient of gravitation system between two objects should be between 1 and 2 which means gravitational theory needs to be revised;non-inertia motion of particle is the superposition of inertia motion and inertia motion of the whole system,etc..