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The Physics of Everyday Life

Why is the sky blue? Why does ice float? How does a candle burn in zero gravity? Everyday physics is the science hiding in plain sight — the rules that govern light, sound, heat, water and motion in the ordinary world around you. This category turns those familiar phenomena into interactive simulations you can explore in your browser, so you can adjust parameters and watch the underlying principles respond in real time. You will learn how Rayleigh scattering colours the sky, how Bernoulli's principle lets aircraft fly, how the Doppler effect shifts the pitch of a passing siren, and why a boomerang returns through gyroscopic precession. Understanding everyday physics matters because it builds genuine scientific intuition: once you see the maths behind a rainbow or a floating ice cube, the whole world becomes a living laboratory.

🔬 Simulations

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★★★ Advanced
Water Ripples
Drop stones on a calm pool and watch concentric ripples expand and interfere — GLSL height field.
Three.js GLSL Waves
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How a Rainbow Forms
Refraction and dispersion of light in raindrops. Snell's law and the 42° Descartes angle. Why a rainbow has a distinct angle.
Beginner
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Pendulum & Chaos
The simple pendulum is the heart of the clock. The double pendulum demonstrates chaotic behaviour arising from deterministic equations.
Beginner
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Elastic Collisions
Conservation of momentum and energy in collisions of balls. Why a ball "stops" when it strikes another head-on.
Beginner
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Waves & Interference
Standing waves, interference and resonance. Why some sounds are louder — the principle of wave superposition.
Beginner
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Atmospheric Convection
Why does hot air rise? Bénard convection cells and the formation of clouds.
Intermediate
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Fluids & the Bernoulli Effect
Bernoulli's principle: speed ↑ → pressure ↓. Explains how aircraft fly, how a carburettor works and the shower-curtain effect.
Intermediate
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Why the Sky is Blue
Rayleigh scattering: I ∝ 1/λ⁴ — shorter wavelengths (blue) scatter more strongly. Why sunsets are orange while the sky is blue.
Beginner
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Why Ice Floats
The density anomaly of water: H₂O is denser at 4°C than when frozen. A model of molecular bonds and the hydrogen-bond anomaly.
Beginner
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Doppler Effect
Change in frequency due to relative motion of the source. The formula f' = f(v±v_o)/(v∓v_s). Applications: radar, ECG, the redshift of stars.
Intermediate
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Boomerang & Gyroscope
Gyroscopic precession and aerodynamic lift. Why a boomerang returns — moments of force and torque.
Intermediate

📐 Key Concepts

Rayleigh Scattering
The intensity of scattered light I ∝ 1/λ⁴. Blue light (~450 nm) scatters about 5.5 times more strongly than red (~700 nm) — which is why the sky is blue.
Bernoulli's Principle
P + ½ρv² + ρgh = const along a streamline. An increase in fluid speed reduces pressure. Explains aircraft lift and the Coandă effect.
Archimedes' Principle
Buoyant force F = ρfluid·Vdisplaced·g. A body floats if its average density is less than that of the fluid.
Doppler Effect
f' = f·(v + vo)/(v − vs). As the source approaches, frequency rises; as it recedes, frequency falls. The basis of Doppler radar and the cosmological redshift.
Snell's Dispersion
n₁ sin θ₁ = n₂ sin θ₂. The refractive index depends on wavelength — which is why a prism splits white light and a rainbow forms.
Angular Momentum
L = Iω is conserved in an isolated system. Gyroscopic precession ωp = τ/L explains the stability of a bicycle, a spinning top and a boomerang.

📖 Learning Resources

📄 Wave Equation & Resonance 📄 Navier–Stokes & Bernoulli’s Principle 📄 Heat Transfer: Conduction, Convection, Radiation

🔗 Related Categories

⚛️ Physics 🔧 Mechanics 🌡️ Thermodynamics 🌈 Optics 🎵 Sound 🌊 Fluid Dynamics
🌟 Everyday physics is the best way to start learning science. Every ordinary phenomenon hides a mathematical beauty: from the scattering of light to the aerodynamics of a boomerang. These simulations answer the "why" behind the things you see every day.

Key Concepts

Topics and algorithms you'll explore in this category

Interactive ModelReal-time browser simulation with live parameter controls
WebGL / Canvas 2DHardware-accelerated rendering in the browser
Mathematical FoundationDifferential equations and numerical integration
Open SourceMIT-licensed code — inspect, fork, and learn
No Install RequiredRuns directly in Chrome, Firefox, Safari, Edge
Educational FocusBuilt to explain the underlying science clearly

Frequently Asked Questions

Common questions about this simulation category

Do these simulations require installation?
No. Every simulation runs entirely in your web browser using WebGL and Canvas 2D. Nothing to install or download — open the page and the simulation starts immediately.
Can I use these simulations for teaching?
Yes — all simulations are designed to be educational and run without an account or login. They are widely used in university lectures, high-school science classes, and self-directed learning. Embed them via iframe or link directly.
What devices do the simulations support?
All simulations work on desktop browsers (Chrome, Firefox, Edge, Safari). Many work on mobile and tablets too, though some physics-heavy simulations benefit from the GPU performance of a desktop or laptop.

Every Everyday Physics simulation on this page is designed to make invisible science visible. Launch an interactive Everyday Physics model and you can drag sliders, change conditions and instantly see how light, sound, buoyancy and motion behave — the same equations used in classrooms and engineering. It is one of the simplest ways to learn Everyday Physics online without any installation. Real-world applications run deep: Doppler radar tracks storms and speeding cars, Bernoulli's principle shapes aircraft wings, and Rayleigh scattering explains both blue skies and orange sunsets, turning daily observations into clear, testable knowledge.

About Everyday Physics Simulations

Pendulums, springs, optics, buoyancy, and the physics of daily life

Everyday physics simulations reveal the elegant mechanics hidden in common objects and phenomena. Simple and compound pendulum simulations show the period-length relationship, the small-angle approximation, and how a double pendulum becomes chaotic in seconds. Ball-in-cup and spring-mass simulations make Hooke's law, resonance, and damping visible. Lens and mirror ray-tracing tools show how glasses and cameras form images from diverging and converging light.

Buoyancy simulations model Archimedes' principle, showing how submerged volume and fluid density determine whether objects sink or float — and why ships made of steel displace themselves into buoyancy. Thermometer and convection simulations show heat flow from hot to cold. Each simulation is deliberately set at the scale and parameter range of real-world objects, making it immediately relatable and useful for reinforcing secondary-school and first-year university physics.

Each simulation in this category is built with accuracy and interactivity in mind. The underlying mathematical models are the same ones used in academic research and professional engineering — just made accessible through a web browser. Changing parameters in real time and observing the results is one of the most effective ways to build intuition for complex scientific and engineering concepts.