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PhysicsDaily

Free physics notes

Physics, worked out one chapter at a time

Structured notes that keep the derivations in — with figures for the geometry, typeset equations, curated video, and simulations you can pull apart.

Lets Know About PhysicsSee the curriculum
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Projectile motionA parabolic trajectory rising from the origin to an apex and falling back to the ground line. Dots mark the projectile's position at equal time intervals, an initial velocity arrow leaves the origin at an angle theta, the apex height is labelled h, and the horizontal range is labelled R.v0θhRyx
Fig. 1 — Projectile motion at equal time steps. Horizontal spacing stays constant; vertical spacing collapses near the apex. s = ut + ½at²

Curriculum

Six branches, in the order they build on each other

Mechanics is being written first — everything after it assumes you have read it. Chapters within a branch are meant to be read in sequence.

  1. 01

    Mechanics

    Kinematics, Newton’s laws, work and energy, momentum, rotation, and gravitation.

    2 chapters
  2. 02

    Waves & Oscillations

    Simple harmonic motion, damping and resonance, sound, standing waves, and interference.

    Planned
  3. 03

    Thermodynamics

    Temperature, heat transfer, kinetic theory, the laws of thermodynamics, and entropy.

    Planned
  4. 04

    Optics

    Reflection and refraction, mirrors and lenses, diffraction, and polarization.

    Planned
  5. 05

    Electrodynamics

    Electric and magnetic fields, circuits, induction, and Maxwell’s equations.

    Planned
  6. 06

    Modern Physics

    Special relativity, quanta, atomic structure, nuclei, and particles.

    Planned

Inside a chapter

Notes written to be studied, not skimmed

  • Derivations kept in

    Results are worked out from stated assumptions — no steps hidden behind “it can be shown”.

  • Equations, properly set

    Math is typeset with KaTeX, so it stays sharp, selectable, and readable at any size.

  • Figures and video

    Diagrams for the geometry, plus a curated explanation embedded where watching beats reading.

  • Simulations inline

    Interactive sims sit next to the theory, so you can change one variable and watch what moves.