Learn how the Work-Energy Theorem (W_net = ΔKE) connects force, distance, and speed in one simple equation. This easy-to-understand physics guide breaks down real-world examples, braking distances, and step-by-step problem-solving methods without complex jargon.
Have you ever wondered how the sun warms your face from millions of miles away, or why an ice cube melts so fast in your hand? Heat is never static; it is constantly on the move, and understanding how it travels is the key to unlocking the physics of our everyday world. In this simple guide, we break down the three main mechanisms of heat transfer: conduction (direct physical contact), convection (moving fluid currents), and radiation (invisible electromagnetic waves). Discover the science behind these invisible forces, and learn exactly how everyday engineering—like a puffy winter coat or a vacuum thermos—masters all three to keep your hot drinks hot and your cold drinks cold.
Wondering why balloons expand when heated or how tire pressure works? Unlock the secrets of gas behavior with our easy-to-understand guide to the Ideal Gas Law ($PV = nRT$). We break down the formula, show you real-world examples, and help you ace your chemistry quiz!
The air molecules around you right now are moving at about 500 meters per second — faster than most bullets. Yet you don’t feel a thing, because each molecule is unimaginably tiny and collides with its neighbours billions of times per second. Kinetic theory explains how this invisible chaos creates everything you can measure: pressure is just trillions of molecular impacts per second, temperature is just how fast the molecules are moving, and the ideal gas law PV = nRT falls straight out of Newton’s laws applied to bouncing particles.
Every system — from engines to the human body — follows a simple rule: energy in equals energy out. This is the first law of thermodynamics, expressed as ΔU = Q − W, where changes in internal energy depend on heat added and work done. Though simple in principle, it explains everything from why engines need fuel to why perpetual motion machines are impossible, shaping how energy flows through the physical world.
Energy is the most fundamental concept in physics — a conserved quantity that never changes in an isolated system. This guide covers kinetic energy, potential energy, conservation of energy, Noether’s theorem, E=mc², and every major energy form with clear explanations, formulas, and an interactive simulation.
The second law of thermodynamics is one of the most profound laws in all of physics. Learn what entropy really means, why heat always flows from hot to cold, why no heat engine can be perfectly efficient, and why the second law gives time its direction.
Entropy is one of the most important and most misunderstood concepts in all of physics. Learn what entropy really means at the molecular level, why it always increases, how Boltzmann’s formula works, and how entropy connects thermodynamics to information theory and the direction of time.
End of content
End of content