Thursday, Sep 10, 2026 The claims desk. Receipts included. POWERED BY LENZ
IsThis

Newtonian physics treated mass, time, and momentum as physical fundamentals.

The Claim

Core properties invoked in physicalist or materialist metaphysics, including mass, time, momentum, and color, cannot be ontologically reduced to an underlying substrate that would count as traditionally physical under Newtonian or pre-quantum-mechanical standards.

The Short Version

The evidence does not support the sweeping assertion of ontological irreducibility. Newtonian physics already treated mass, absolute time, and momentum as physical fundamentals, while classical accounts often explained color through primary qualities. Modern relativity, quantum theory, and unresolved color debates complicate those historical models, but they do not establish that reduction to every traditionally physical substrate is impossible.

Caveats

  • Modern relational accounts of mass, momentum, and spacetime do not by themselves prove irreducibility to every classical physical substrate.
  • Treating a quantity as fundamental within Newtonian mechanics is not identical to successfully reducing it ontologically.
  • Color physicalism, primitivism, and related theories remain contested, so categorical claims about color irreducibility are unwarranted.

The Receipts

  1. Identity and Individuality in Quantum Theory (Stanford Encyclopedia of Philosophy)

    plato.stanford.edu

  2. Knowledge Argument Against Physicalism | Internet Encyclopedia of Philosophy

    iep.utm.edu

  3. Color (Stanford Encyclopedia of Philosophy)

    plato.stanford.edu

  4. Color > Color: Special Topics (Stanford Encyclopedia of Philosophy)

    plato.stanford.edu

  5. Scientific Reduction (Stanford Encyclopedia of Philosophy)

    plato.stanford.edu

  6. Physicalism — OECS - Open Encyclopedia of Cognitive Science

    oecs.mit.edu

  7. Newton, Isaac (1642–1727) - Routledge Encyclopedia of Philosophy

    rep.routledge.com

  8. What Ontology for Relational Quantum Mechanics?

    link.springer.com

  9. Humean supervenience and tripartite entanglement relations | Global Philosophy | Springer Nature Link

    link.springer.com

  10. Physicalism Versus Quantum Mechanics

    www-physics.lbl.gov

+ 21 more sources — see the full list on Lenz

Filed Under

ColorMassMaterialismMomentumNewtonian MechanicsPhysicalism

More Fact Checks