Physics from Zero
This path assumes no physics background at all — just basic algebra. You will build the subject layer by layer: first how to describe motion, then why it changes, then energy, waves, electricity, and finally a glimpse of modern physics. Each module ends with practice before you move on.
Module 1: The language of physics
Units, significant figures, and vectors — the language every later module speaks.
Learn
- Scientific Notation — Writing Very Big and Very Small Numbers
- Significant Figures — Reporting Measurements Honestly
- Vectors vs Scalars — The Two Kinds of Quantities in Physics
Practice
Module 2: Describing motion
Describing motion precisely: velocity, acceleration, and reading motion graphs.
Learn
- Acceleration — Definition, Formula and Worked Examples
- Vector Addition — Tip-to-Tail, Components and Resultants
- Graphing Motion — Reading Position, Velocity and Acceleration Graphs
Practice
Module 3: Forces and Newton's laws
Why motion changes: the three laws of motion and the force of friction.
Learn
- Newton's First Law of Motion — Inertia Explained
- Newton's Second Law — F = ma Explained with Examples
- Newton's Third Law — Action and Reaction, Clearly Explained
- Friction Force — Static vs Kinetic Friction Explained
Practice
Module 4: Energy and momentum
Shortcuts that solve hard problems: energy conservation and momentum conservation.
Learn
- Work-Energy Theorem — Work Equals Change in Kinetic Energy
- Conservation of Momentum — Collisions Explained
Practice
Module 5: Waves
How energy travels without matter moving: the essential wave ideas.
Learn
- Wave Speed, Frequency and Wavelength — v = fλ Explained
- Transverse vs Longitudinal Waves — Definitions and Examples
- Sound Waves — How Sound Travels, Simply Explained
Practice
Module 6: Electricity basics
Charge, current, voltage and the circuits that run the modern world.
Learn
- Electric Charge — The Basics: Positive, Negative and Conservation
- Ohm's Law — V = IR Explained with Circuits and Examples
- Series vs Parallel Circuits — Rules, Formulas and Examples
Practice
Module 7: Heat and gases
Thermal energy, temperature, and how gases behave.
Learn
Practice
Module 8: Light and optics
What light does at mirrors, lenses and boundaries.
Learn
- Law of Reflection — Angle of Incidence Equals Angle of Reflection
- Refraction and Snell's Law — Why Light Bends
Practice
Module 9: A taste of modern physics
The 20th-century revolutions: quanta and relativity, in plain language.
Learn
- Photoelectric Effect — Einstein's Photons Explained
- Special Relativity Basics — Einstein's Two Postulates