Knowra Classical physics Classical physics Classical physics comprises theories of matter, motion, forces, fields, heat, and light that do not rely on quantum mechanics or relativity. It describes everyday phenomena when quantum and relativistic effects are negligible.
Newtonian mechanics : A theory of motion in which forces determine changes in bodies’ momentum. It supplies the standard classical account of everyday motion and forces.
Newton's laws of motion : Three laws relating inertial motion, net force, and equal-and-opposite interactions. They provide the basic rules for predicting how classical bodies move.
Quantum mechanics : A theory describing physical systems through quantized states, probabilities, and measurement outcomes. It replaces classical descriptions when quantum effects cannot be neglected.
Celestial mechanics : The application of mechanics to the motion of planets, moons, comets, and other celestial bodies. Newtonian models predict many orbital motions with high accuracy.
Galileo Galilei : An Italian scientist whose work on motion and observation helped establish early modern physics. His studies of falling bodies and inertia helped prepare the way for Newtonian mechanics.
Classical electromagnetism : The theory of electric and magnetic fields and their interactions with charges and currents. It explains classical electrical, magnetic, and optical phenomena through fields.
Lagrangian mechanics : A formulation of mechanics that derives motion from a system’s Lagrangian and variational principles. It recasts classical dynamics in a form suited to constraints and symmetries.
Special relativity : A theory of space, time, and motion in inertial frames that makes the speed of light invariant. It supersedes Newtonian mechanics at speeds approaching the speed of light.
Classical field theory : The description of physical systems using fields governed by classical equations. It covers electromagnetic and other continuous field models within classical physics.
Isaac Newton : An English mathematician and physicist who formulated the laws of motion and universal gravitation. His synthesis became the central framework of classical mechanics.
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