Newton's Laws of Motion
The three laws governing every force and acceleration. Foundation of all classical mechanics — from billiard balls to rocket trajectories.
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Master Physics Fundamentals Through Interactive Learning
From Newton's laws and energy conservation to transverse waves and quantum mechanics — a free, comprehensive physics education platform built to make every concept click.
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Core Concepts
The laws that run our universe
Physics fundamentals are precise descriptions of how everything moves, stores energy, and interacts. Every branch of science and engineering builds on these foundations.
Transverse Waves Explained
Definition, labeled diagram, wavelength, amplitude, frequency, polarization — with real examples from light to guitar strings. 6,800 words.
Read the guide →What Is Energy?
Kinetic, potential, and thermal energy explained. The conservation of energy law and why it is the most important principle in all of physics.
Read the guide →Projectile Motion
Range, max height, time of flight equations with full worked examples. Why 45° maximises range and common exam mistakes corrected.
Read the guide →Wave Speed, Frequency & Wavelength
The universal wave equation v = fλ explained from first principles. From sound waves to light — worked examples and Doppler effect.
Read the guide →Conservation of Momentum
The principle behind every collision. Elastic vs inelastic collisions, centre of mass, worked examples, and why momentum never disappears.
Read the guide →Why Physics Fundamentals
The physics education platform
you've been waiting for
We're building more than a website — it's a complete learning environment where physics fundamentals become intuitive through interaction, not memorization.
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Complete Physics Curriculum
From classical mechanics through electromagnetism to quantum physics — every fundamental concept explained with depth and clarity by working physicists.
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Interactive Simulations
Manipulate variables, observe outcomes, build intuition. Our simulations let you experiment with physics in ways a textbook never could.
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Practice That Builds Mastery
Over 1,000 problems ranging from conceptual questions to multi-step calculations, each with detailed step-by-step solutions.
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Conceptual Understanding First
We don't just hand you formulas. Every topic starts with the physical intuition — the 'why' — before introducing the mathematics.
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Visual Explanations
Complex ideas like vector fields, wave interference, and orbital mechanics become clear through carefully designed diagrams and animations.
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Free & Accessible
Quality physics education should never sit behind a paywall. Everything we build — every lesson, simulation, and problem set — is completely free.
Comprehensive Curriculum
Every branch of physics,
explained from the ground up
Our curriculum covers all physics fundamentals — from the classical mechanics of Newton to the strange world of quantum theory. Each topic is built for genuine understanding, not exam prep alone.
Classical Mechanics
LiveNewton's Laws, Kinematics, Momentum
Energy & Thermodynamics
LiveConservation Laws, Heat Transfer, Entropy
Waves & Oscillations
LiveTransverse Waves, Sound, Resonance
Electromagnetism
PlannedElectric Fields, Circuits, Maxwell's Equations
Optics
PlannedReflection, Refraction, Diffraction, Lenses
Modern Physics
PlannedSpecial Relativity, Quantum Mechanics, Nuclear
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Everything you need to master
physics fundamentals
Comprehensive lessons on all core physics topics
Interactive simulations and virtual labs
1,000+ practice problems with full solutions
Video explanations and demonstrations
Formula sheets and quick-reference guides
Study paths tailored to your course
Community Q&A and discussion forums
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Latest Articles
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Classical Mechanics
13 min read
Why Is Projectile Motion a Parabola? The Physics of Curved Trajectories
Dr. James Carter
Thermodynamics
12 min read
Kinetic Theory of Gases: How Molecular Motion Explains Pressure and Temperature
Dr. Sarah Kim
Waves & Optics
14 min read
Wave Speed, Frequency, and Wavelength: The Complete Relationship (v = fλ)
Dr. Elena Vasquez
Classical Mechanics
11 min read
Gravitational Force: Newton's Law of Universal Gravitation Explained
Dr. Marcus Webb
Thermodynamics
11 min read
The First Law of Thermodynamics: Energy, Heat, and Work Explained
Dr. Sarah Kim
Classical Mechanics
16 min read
Conservation of Momentum: The Physics Principle Behind Every Collision
Dr. James CarterWhat Are Physics Fundamentals?
Physics fundamentals are the core laws and principles describing how the universe behaves at every scale. Mastering them is the single most effective investment any science or engineering student can make.
Classical Mechanics
Classical mechanics begins with Newton's three laws. The first establishes inertia. The second (F = ma) quantifies how force produces acceleration. The third explains action–reaction pairs. Together they predict projectile trajectories, satellite orbits, and forces in every engineered structure.
All Mechanics Articles →Waves & Optics
Wave physics governs how energy propagates. Transverse waves — oscillation perpendicular to propagation — include all electromagnetic radiation. The wave equation v = fλ connects speed, frequency, and wavelength for every wave type in the universe.
All Waves Articles →Energy & Thermodynamics
Energy is the central concept connecting all physics. Conservation of energy — it cannot be created or destroyed, only transformed — is one of the deepest truths in science. The first law of thermodynamics applies this to heat and work. The kinetic theory of gases links molecular motion to pressure.
All Thermodynamics Articles →Forces & Conservation Laws
Conservation laws are the deepest principles in physics. Conservation of momentum governs every collision. Newton's law of gravitation describes the force between any two masses — from dropping a ball to the orbit of the Moon. These are exact laws with no known exceptions.
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Everything on Physics Fundamentals
Every article, topic, author, and resource — all in one place for easy discovery.
Frequently Asked Questions
Common questions about physics fundamentals
What are the fundamentals of physics?
The fundamentals of physics encompass the core principles governing how the universe works: classical mechanics (Newton's laws, motion, forces, energy), thermodynamics (heat and entropy), electromagnetism (electric and magnetic fields), waves and optics (light and sound behavior), and modern physics (quantum mechanics and relativity). These branches form the foundation for understanding everything from how a ball rolls down a ramp to how stars generate energy through nuclear fusion.
Is Physics Fundamentals really free?
Yes, Physics Fundamentals is completely free and always will be. We believe quality physics education should be accessible to every student regardless of financial circumstances. All lessons, simulations, practice problems, and study guides are available at no cost.
Who creates the content on Physics Fundamentals?
Our content is developed by physicists and experienced educators who hold advanced degrees in physics and related fields. Every article, simulation, and problem set undergoes rigorous review to ensure scientific accuracy and pedagogical effectiveness.
What topics does Physics Fundamentals cover?
We cover the full spectrum of introductory to intermediate physics: kinematics, Newton's laws, energy and momentum, rotational dynamics, thermodynamics, fluid mechanics, transverse waves, sound, optics, electricity, magnetism, circuits, and an introduction to modern physics including special relativity and quantum mechanics.
How is Physics Fundamentals different from a textbook?
Unlike a traditional textbook, Physics Fundamentals emphasizes conceptual understanding through interactive simulations, step-by-step visual explanations, and immediate feedback on practice problems. We prioritize building physical intuition before introducing mathematical formalism, which research shows leads to deeper and more lasting comprehension.
What is the best way to learn physics fundamentals?
The most effective approach combines conceptual understanding with mathematical practice. Start by grasping the physical intuition behind each concept before memorizing equations. Work through solved examples, then attempt problems independently. Use visual aids and simulations to build spatial and quantitative intuition. Consistency matters more than intensity: short daily sessions outperform cramming.