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Physics Fundamentals Blog

In-depth articles on physics fundamentals written by physicists and educators. Clear explanations, real-world examples, and the conceptual depth you won't find in a typical textbook.

Projectile motion parabola — water fountain arc showing the curved parabolic trajectory under gravity
Classical Mechanics
Dr. James Carter13 min read

Why Is Projectile Motion a Parabola? The Physics of Curved Trajectories

Every object launched into the air — a basketball, a cannonball, a water droplet from a fountain — traces the same distinctive curved path under gravity alone. That curve is a parabola, one of...

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Kinetic theory of gases — molecules in motion representing gas pressure and temperature
Thermodynamics
Dr. Sarah Kim13 min read

Kinetic Theory of Gases: How Molecular Motion Explains Pressure and Temperature

What Is the Kinetic Theory of Gases? The kinetic theory of gases is a scientific model that explains the macroscopic properties of gases — pressure, temperature, and volume — in terms of...

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Wave speed frequency and wavelength — laboratory oscilloscope showing wave properties
Waves & Optics
Dr. Elena Vasquez14 min read

Wave Speed, Frequency, and Wavelength: The Complete Relationship (v = fλ)

Every wave — whether a ripple on water, a sound in air, a transverse wave on a string, or a pulse of light crossing a vacuum — is governed by one fundamental relationship: v = fλ. This single e...

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Newton's law of universal gravitation — Earth from space showing gravitational attraction between masses
Classical Mechanics
Dr. Marcus Webb11 min read

Gravitational Force: Newton's Law of Universal Gravitation Explained

Every object in the universe with mass attracts every other object with mass. This isn't a metaphor — it's a precise, quantitative law. Newton's law of universal gravitation, published in 1687...

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First law of thermodynamics — fire illustrating heat as a form of energy transfer
Thermodynamics
Dr. Sarah Kim11 min read

The First Law of Thermodynamics: Energy, Heat, and Work Explained

Every engine ever built, every metabolic reaction in your body, every star burning in the sky — all operate under one inviolable constraint: the first law of thermodynamics. It is, at its core,...

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Conservation of momentum — Newton's cradle demonstrating elastic collision and momentum transfer
Classical Mechanics
Dr. James Carter16 min read

Conservation of Momentum: The Physics Principle Behind Every Collision

When two billiard balls collide, when a rocket expels exhaust, when a gun recoils after firing, when subatomic particles scatter in a collider — the same deep principle governs every one of the...

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Projectile motion — basketball tracing a parabolic arc through the air
Classical Mechanics
Dr. James Carter15 min read

Projectile Motion: The Complete Guide with Equations and Worked Examples

A basketball arcing toward the hoop, a cannonball launched from a fortress, a stream of water from a garden hose — all are examples of projectile motion. It's one of the first topics you encoun...

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What is energy — lightning bolt representing electrical energy and energy transformation
Thermodynamics
Dr. Sarah Kim12 min read

What Is Energy? The Most Important Concept in All of Physics, Explained

What Is Energy? The Definition in Physics The definition of energy in physics: energy is a scalar quantity that measures the capacity of a system to do work or produce heat. It is not a...

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Force equals mass times acceleration — athlete demonstrating F=ma with explosive push
Classical Mechanics
Dr. James Carter14 min read

Newton's Second Law (F = ma): Why This Equation Runs the Universe

If you could only keep one equation from all of physics, it should be this one: F = ma. Newton's second law of motion is the most powerful and widely applied equation in classical physics. It c...

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Transverse waves — ripples spreading across water surface showing perpendicular wave oscillation
Waves & Optics
Dr. Elena Vasquez22 min read

Transverse Waves: Definition, Examples, Properties, and Diagrams (Complete Guide)

When you pluck a guitar string, watch ripples cross a pond, or see light travel 93 million miles from the Sun to your eyes, you're witnessing transverse waves in action. A transverse wave is on...

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Newton's laws of motion — billiard balls illustrating force, mass and acceleration
Classical Mechanics
Dr. James Carter16 min read

Newton's Laws of Motion: Complete Guide to All Three Laws (With Examples)

Every object you have ever seen — every car on the highway, every satellite in orbit, every atom vibrating in your coffee cup — follows the same three rules. These are Newton's laws of motion,...

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