Let us also agree that this knowledge is tacit in
classical physics. Finally, let us agree that we should make some epistemic community explicit, or make explicit what is ordinarily observable, and that it then follows - in both cases, quantum, and classical - that there must be supplementary statements saying just what this is, and that these supplements will have a very different character from ordinary scientific statements.
With the advent of quantum theory in science the transcendental horizon became the border between the macro-world of
classical physics and the micro-world of subatomic physics.
This was due primarily to momentous breakthroughs in quantum mechanics that eclipsed interest in
classical physics, which was by then considered passe.
Nevertheless, the quantum theory, as it is now called, proved so fundamental that all physics prior to 1900 is called
classical physics and all physics after 1900 modern physics.
We now have a pretty good, even if not complete, understanding of how quantum physics gives rise to
classical physics - there's no divide between the everyday/intuitive and the 'weird'.
In
classical physics, this might appear as a billiard ball struck by a cue, traveling in a line.
2) In
classical physics, an element or object is either a particle or a wave with entirely different characteristics and behavior.
In this connection, the every-day-experience-based belief in the causal power of a person's mental effort to influence the subsequent physically described reality is rationally buttressed by the fact that contemporary (i.e., quantum) science supports that intuition, rather than diminishing us by claiming, as did
classical physics, that the experienced causal effectiveness in the physical world of our mental intentions is "the illusion of conscious will".
This introductory physics text covers the basic concepts and principles related to the standard topics in
classical physics and 20th-century physics: Newtonian mechanics and the physics of fluids; heat and thermodynamics; wave motion and sound; electricity and magnetism; light and geometric and wave optics; and special relativity, quantum physics, atomic physics, and nuclear physics.
The first focused on the basics of
classical physics. This one takes you deep into the weird realm of quantum theory.
We suddenly see disclosed here a momentous fuller development of what was implied in Heisenberg's crucial earlier statement that "the concepts of
classical physics are just a refinement of the concepts of daily life," and are as such "an essential part of the language which forms the basis of all science." If or since daily life with its concepts and language is in a profound sense historical, continually reshaping itself by the ever mutating "spirit of the time," which expresses itself most vividly in art (and religion), we move in the direction of an outlook that would identify the deepest knowable level of reality with the human mind's historically evolving language, expressing mutating concepts of "daily life," as molded by and molding art and religion, as well as science.