From the swing of a pendulum to the warp of spacetime, learn the fundamental laws of physics through clean visuals, plain language, and the elegant mathematics underneath.
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Physics Fundamentals is a free, structured library for understanding how the universe works from first principles.
Most learners meet physics as a pile of formulas. We take the opposite path: start with the physical idea, build intuition, then let the equation become a compact summary of what you already understand.
Open a series, read in order, and move slowly enough to connect each idea to a real physical situation. Physics rewards careful thinking more than memorization.
Most physics content gives isolated formulas. This library shows the underlying ideas so each article fits into the bigger picture.
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Motion, forces, energy, and the first principles behind the physics you can see and measure.
A first-principles guide to force, mass, acceleration, inertia, and why Newton's three laws still explain most motion around us.
Energy changes form constantly, but the total stays fixed. Learn the idea that connects falling objects, heat, light, and atoms.
Electric fields, magnetic fields, circuits, waves, and the unification that explains light.
Heat, work, entropy, probability, and the physics of systems with many moving parts.
Space, time, gravity, and why measurements depend on motion and curvature.
Wavefunctions, uncertainty, measurement, and the rules that govern matter at small scales.
The double-slit experiment shows that particles can spread like waves, arrive like dots, and force us to rethink what reality means.
The central equation of quantum mechanics predicts how probability waves change over time.
A first-principles guide to force, mass, acceleration, inertia, and why Newton's three laws still explain most motion around us.
Energy changes form constantly, but the total stays fixed. Learn the idea that connects falling objects, heat, light, and atoms.
Electricity, magnetism, and light are one connected story. Maxwell's equations show how fields create and move through space.
Entropy is not just messiness. It is a precise way to count how many microscopic arrangements can produce the same visible state.
Special relativity is not science fiction. It follows from one strange fact: everyone measures the same speed of light.