classical mechanics

American  

noun

Physics.

1. the branch of mechanics that is based on Newton's laws of motion and that is applicable to systems that are so large that Planck's constant can be regarded as negligibly small (distinguished from quantum mechanics).

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Etymology

Origin of classical mechanics

First recorded in 1930–35

Example Sentences

Until this hypothetical key to the mysteries puts a bow on string theory and reconciles quantum and classical mechanics, don’t bother.

From The Wall Street Journal • Jan. 9, 2026

In classical mechanics, if nothing moves, no work is done, meaning there is no energy cost associated with stopping something from happening.

From Science Daily • Jan. 6, 2026

To do this, felines exploit the physical laws of classical mechanics: by placing their front paws close to their body, they reduce their moment of inertia.

From Scientific American • Jul. 24, 2023

We once harnessed our knowledge of classical mechanics to build machines, to make factories, leading to the industrial revolution.

From Salon • Oct. 6, 2022

For example, the dinosaurs may have been exterminated by the impact of an asteroid whose orbit was completely determined by the laws of classical mechanics.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond