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📚 Encyclopedia

86 entries, written plainly, with a diagram wherever a diagram explains it better than a paragraph.

⚛️ Physics — 13 entries

⚛️ Physics ElectricityThe movement of charge. A current is electrons flowing through a conductor, pushed by voltage and held back by resista… ⚛️ Physics EnergyThe capacity to do work. It cannot be made or destroyed, only moved and changed from one kind into another — which is … ⚛️ Physics FrictionThe force that resists sliding — the reason walking works, brakes work, and machines get hot. ⚛️ Physics GravityThe pull every piece of matter has on every other piece — too weak to notice between small things, and the thing that … ⚛️ Physics Heat and temperatureHeat is energy moving because of a temperature difference. Temperature is how fast the particles are jiggling. A cup o… ⚛️ Physics LightAn electromagnetic wave that also behaves like a stream of particles. It travels in straight lines until something ref… ⚛️ Physics MagnetismMoving charge makes a magnetic field, and a changing magnetic field makes charge move. Nearly all the world's electric… ⚛️ Physics MomentumMass times velocity — how hard something is to stop. In any collision the total stays the same, which makes it one of … ⚛️ Physics Newton's laws of motionThree sentences that explain why a bus passenger lurches forward when the brakes go on, why a heavy trolley is hard to… ⚛️ Physics Nuclear energyEnergy released when atomic nuclei split or join. The amounts are enormous because a tiny amount of mass becomes energ… ⚛️ Physics Simple machinesLever, pulley, wheel and axle, inclined plane, wedge and screw. None of them reduces the work; each changes the deal y… ⚛️ Physics SoundA travelling squeeze and stretch of the air. It needs something to travel through, which is why space is silent. ⚛️ Physics Weight and massMass is how much matter a thing contains. Weight is the force gravity exerts on that mass. Everyday speech confuses th…
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