what is the NEWTONIAN MECHANICS???

Newtonian mechanics is the study of the relationship between force, mass, and motion.Sir Isaac Newton developed a set of universal principles to explain and predict the motion of objects in the natural world, and the degree to which these objects change their relative motion by interacting with external forces. Newton embodied the interrelationship between the physical concepts of force, mass, and acceleration into his three laws of motion,which are known as Newton’s law of motions.Many natural phenomenon can be described from the application of these laws of motion.

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Newtonian mechanics is that branch of mechanics which is based on Newton’s Laws of motion. It is also called classical mechanics.
Classical mechanics describes the motion of macroscopic objects, from projectiles to parts of machinery, as well as astronomical objects, such as spacecraft, planets, stars, and galaxies.