Newton's second law is not a resultant force, it should be seen as a pure force.
If we separate the force of Newton's second law from the resultant force, to extract the force of the second law from the resultant force, You will find that the forces in Newtonian mechanics except gravity are all inertial forces (or repulsive forces), whether it is the tension of the light on the top of the room, or the support of the elevator floor, they are the resultant force of Newton's second law and the second law of gravity, the second law is a more basic force, a purer force. It's like analyzing more basic elements from the "resultant force," and then it can describe much more, like it can describe "why the train ball accelerates in the opposite direction," it can describe the inertial force, it can recognize the existence of inertial forces. The Newton's second law as a pure force, we can find that Newton has three laws are all inertial force, the second law is the continuous action of the third law, the first law it is inertial force, in addition to gravity, all the forces in Newtonian mechanics can use inertial force unified, three laws only one force: inertial force (repulsion). Taking Newton's second law away from the resultant force and taken as a more basic element is closer to the essence than the original Newtonian mechanics.
Dear Duan Xian Xiang Nothing in our universe is working mechanically by push/pull as our icons stating.
Read this article , might help
Article The Mythos of Gravity Or (Newtonian and Einsteinian Gravity is a Myth)
It would be a good idea to study classical mechanics. One starting point might be this one: https://ocw.mit.edu/courses/8-01sc-classical-mechanics-fall-2016/
Another could be this one: https://www.feynmanlectures.caltech.edu/I_toc.html
There's no point pretending to live in the 17th century...
Newton's second law of motion, which is often stated as \( F = ma \) (where \( F \) is the net force applied to an object, \( m \) is the mass of the object, and \( a \) is the acceleration of the object), is not a synthetic force. Rather, it is a fundamental principle of classical mechanics that describes how the motion of an object changes in response to forces applied to it.
In physics, a "synthetic force" is not a standard term. However, the concept might be related to "fictitious forces" or "pseudo forces." These are apparent forces that arise in non-inertial reference frames, such as the centrifugal force or the Coriolis force. These forces are not real in the sense that they do not arise from physical interactions but are perceived due to the acceleration of the reference frame itself.
In contrast, Newton's second law is a core principle that applies in all inertial reference frames and describes the relation between real forces and the motion of objects. It's a cornerstone of classical mechanics and has been extensively verified by experiments and observations. The law holds true in a wide range of situations, although it needs to be modified when dealing with speeds approaching the speed of light (as in special relativity) or in the realm of quantum mechanics.
Dear Harri Nothing in the universe is working mechanically as Newton or Mr. Einstein stated. The physics you describe is belong to 400years ago that they did not anything about universal concept. Article The Mythos of Gravity Or (Newtonian and Einsteinian Gravity is a Myth)
Harri Shore
I have modified Newton's Second Law, and now it's a single force, not a synthetic force.
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