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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.
14 min readA ball whirled on a string, a car rounding a bend, the Moon orbiting Earth, an electron in a magnetic field — all are in circular motion. Despite moving at constant speed, every object in unifo...
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13 min readConnect a battery to a resistor. Double the voltage and the current doubles. Halve the resistance and the current doubles again. This simple proportionality — V = IR, Ohm's Law — governs the be...
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14 min readEverything electrical — lightning, batteries, neural signals, transistors — begins with one fundamental property of matter: electric charge. The force between charges, described by Coulomb's La...
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15 min readSimple harmonic motion (SHM) is the most important type of oscillation in physics. A pendulum swinging, a mass bouncing on a spring, a vibrating guitar string, an alternating electric current —...
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13 min readAn ambulance races past you. The siren sounds higher-pitched as it approaches and drops noticeably as it passes. A galaxy 500 million light-years away has its light shifted toward the red end o...
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14 min readEvery breath you take, every balloon you inflate, every weather system on Earth obeys one elegant equation: PV = nRT. The ideal gas law connects the pressure, volume, temperature, and quantity...
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13 min readPut an equal mass of water and sand in the sun. The sand gets scorching hot in minutes; the water barely warms. Same energy input, same mass — completely different temperature rise. The propert...
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16 min readEvery time you use a mobile phone, get an X-ray, feel the warmth of sunlight, or see the colours of a rainbow, you are interacting with the electromagnetic spectrum. The electromagnetic spectru...
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14 min readDrop a drop of ink into a glass of water. It spreads — slowly, irreversibly — until uniformly distributed. You will never see the ink spontaneously re-concentrate. Crack an egg: you cannot uncr...
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12 min readAcceleration is the rate at which velocity changes. Because velocity is a vector, any change in either the speed or the direction of motion constitutes acceleration. Every time you brake in a c...
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18 min readIn 1905, a 26-year-old patent clerk named Albert Einstein published four papers that transformed physics. One of them — "On the Electrodynamics of Moving Bodies" — introduced special relativity...
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12 min readSprings are among the most studied objects in physics — not because springs themselves are special, but because the spring restoring force is the simplest and most important type of restoring f...
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13 min readPush a box across a floor. Lift a weight from the ground. Compress a spring. In each case, a force acts through a distance — and that's the physical definition of work done. Work done in physic...
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15 min readEvery electric motor, every MRI machine, every loudspeaker, every hard drive relies on the same fundamental interaction: magnetic fields exerting forces on moving charges. Understanding how mag...
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13 min readDrop a feather and a hammer on the Moon — they hit the ground at exactly the same time. This famous demonstration (carried out by Apollo 15 astronaut David Scott in 1971) reveals something prof...
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11 min readIn everyday conversation, "speed" and "velocity" are used interchangeably. In physics, they are fundamentally different quantities — and mixing them up leads to wrong answers. Speed is a scalar...
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16 min readThe second law of thermodynamics is arguably the most profound statement in all of science. It explains why time appears to have a direction (why we remember the past and not the future), why n...
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14 min readFriction is the contact force that opposes relative motion between surfaces. It is why you can walk without slipping, why cars can brake, and why you need to keep pushing a box to keep it movin...
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15 min readIf you have ever heard a thunderclap, felt a bass beat through a wall, or watched a Slinky spring ripple back and forth, you have experienced longitudinal waves. Unlike transverse waves — where...
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14 min readA spinning ice skater pulls her arms inward — and immediately spins faster. A planet orbits faster when closer to the Sun. A gyroscope resists being tilted. A spinning top maintains its orienta...
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15 min readSwitch on a light, charge a phone, fire a neuron — every one of these events is driven by electric fields and potentials. The electric field E tells you the force per unit charge at any point i...
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13 min readWhen you push a door open, you push near the edge — not near the hinge. Instinctively you know that the same force applied further from the pivot produces a greater turning effect. That turning...
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16 min readKinetic energy is one of the two fundamental forms of mechanical energy — the other being potential energy. Where potential energy is stored energy waiting to be released, kinetic energy is ene...
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16 min readThe Sun has been shining for 4.6 billion years and will continue for another 5 billion. The energy source is not chemical — no amount of burning hydrogen gas could sustain that output for geolo...
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15 min readEvery time you look in a mirror, see a rainbow, or watch a straw appear bent in a glass of water, you are witnessing two of the most fundamental behaviours of light: reflection and refraction....
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12 min readLift a 10 kg box one metre in one second versus one minute — the work done is the same, but the second case feels much easier. What's different is the rate at which you do that work. That rate...
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14 min readIn 1905, Albert Einstein published the paper that would win him the Nobel Prize — not his theory of relativity, but his explanation of the photoelectric effect. When light shines on a metal sur...
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14 min readA cricket ball and a lorry travelling at the same speed are very different things to stop. The lorry is far harder to halt — not just because it is heavier, but because it has far more momentum...
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15 min readc = 299,792,458 m/s — that number is not an approximation. Since 1983, the speed of light has been fixed by definition, and the metre is derived from it. The speed of light is the most fundamen...
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16 min readWave-particle duality is the experimental fact that quantum objects — photons, electrons, atoms — behave as waves in some experiments and as particles in others. It is not a paradox or an appro...
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15 min readIn 1687, Isaac Newton published his Principia Mathematica — arguably the most important scientific work ever written. Among its results was a single equation that unified the fall of an apple w...
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14 min readIn 1801, Thomas Young performed one of the most elegant experiments in the history of physics. He shone light through two narrow slits onto a screen — and instead of two bright bands, he saw a...
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14 min readHeat spontaneously flows from hot objects to cold ones — the direction dictated by the second law of thermodynamics and the concept of entropy. But how does it actually transfer? There are exac...
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15 min readEvery time you charge your phone, drive a car, or switch on a light, you are using a technology built on a discovery made in 1831 by Michael Faraday: electromagnetic induction. Faraday found th...
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14 min readIn 1927, Werner Heisenberg derived one of the most famous results in all of science: it is fundamentally impossible to simultaneously know the exact position and exact momentum of a quantum par...
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14 min readA car brakes from 30 m/s to rest in 50 m — how long does that take? A ball thrown upward at 15 m/s — how high does it reach? A stone dropped from a cliff — how fast is it moving after 3 seconds...
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13 min readA hammer can be balanced on a fingertip — but only if you position your finger at exactly the right point. A high-jumper arches their back over the bar so that their centre of mass passes under...
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16 min readEvery atom of carbon-14 in your body is slowly decaying. Every gram of uranium in Earth's crust is undergoing spontaneous nuclear transformation. Radioactive decay is the process by which an un...
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12 min readA cable holds a suspension bridge in place. A rope supports a rock climber. A string connects two masses in an Atwood machine. In each case, the force transmitted through the material is tensio...
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13 min readEvery 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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12 min readEvery time you sit in a chair, stand on a floor, or press a book against a table, a force pushes back on you — perpendicular to the surface. This is the normal force. It is the contact force th...
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13 min readWhat 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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14 min readEvery wave — a ripple on water, sound in air, a light beam crossing space — obeys one equation: v = fλ. Wave speed equals frequency times wavelength. This single relationship connects three of...
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11 min readEvery 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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11 min readEvery 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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16 min readWhen 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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15 min readA basketball arcs toward the hoop. A cannonball launches from a cliff. A long-jumper leaves the ground at an angle. All are examples of projectile motion — motion under gravity alone, with no o...
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12 min readWhat 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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14 min readNewton's Second Law of Motion states that the net force acting on an object equals the object's mass multiplied by its acceleration: F = ma. The acceleration produced is directly proportional t...
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22 min readWhen 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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16 min readEvery 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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Physics Fundamentals
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