Introduction. The words physics greek words 'phusis'

Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. It is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves.

The word "physics" comes from the Ancient Greek word phusikḗ (φυσική), meaning "knowledge of nature," and phúsis (φύσις), meaning "nature."