Most textbooks and exams accept Isaac Newton as “the father of physics,” especially as the father of classical physics. However, in modern discussions, the title can also refer to Galileo Galilei or Albert Einstein , depending on which part of physics you mean.

Quick Scoop

  • Isaac Newton is most commonly called the father of physics because his laws of motion and universal gravitation created the foundation of classical mechanics.
  • Galileo Galilei is often called the father of modern or experimental physics for using systematic experiments and improving the telescope.
  • Albert Einstein is widely known as the father of modern physics or modern theoretical physics for special and general relativity and key work in quantum theory.
  • Other “fathers” exist for subfields:
    • Ernest Rutherford – nuclear physics.
* Max Planck – quantum physics.

Why so many “fathers”?

The phrase “who is the father of physics” sounds like there should be just one person, but physics evolved across centuries with different pioneers at different stages. School-level general knowledge questions usually expect Isaac Newton as the one-line answer, but historians of science often highlight Galileo and Einstein as equally foundational in their own eras.

If you’re answering a quiz or exam and it just says “Who is the father of physics?” with no extra detail, the safest single-word answer is: Newton.

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