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Frequently Asked Questions

• What is classical physics?

  Classical physics includes the traditional branches and topics that were recognized and well-developed before the beginning of the 20th century— classical mechanics , acoustics , optics , thermodynamics, and electromagnetism .

• What are the branches of classical physics?

  Depending on point of view, among the branches of theory sometimes included in classical physics are variably: Classical mechanics Newton's laws of motion Classical electrodynamics (Maxwell's Equations) Classical thermodynamics Special relativity and general relativity Classical chaos theory and nonlinear dynamics

• What is a classical theory?

  In the context of general and special relativity, classical theories are those that obey Galilean relativity. Depending on point of view, among the branches of theory sometimes included in classical physics are variably:

• Can the laws of classical physics be used to describe nature?

  Beginning at the atomic level and lower, the laws of classical physics break down and generally do not provide a correct description of nature. Electromagnetic fields and forces can be described well by classical electrodynamics at length scales and field strengths large enough that quantum mechanical effects are negligible.