Mechanics

Mechanics defines the rules and conditions according to which objects in nature maintain their state, or modify it from rest or motion. It is an abstract science in its developments and experimental in its basic principles. It is also a purely and abstract mathematical science, with its own hypotheses and postulates (which nature dictates to it), and this is what is touched when comparing a material point to a geometric point, and counting bodies that have a certain size as if they were fictitious bodies that cannot be deformed. Mechanics belongs to the experimental sciences when it deals with problems of natural and deformable solid bodies, but even when applied to solid bodies.