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Physics, Explained

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LEVEL 1 · 0/3LEVEL 2 · 0/3LEVEL 3 · 0/3LEVEL 4 · 0/3LEVEL 5 · 0/3START
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Physics you run yourself: drop a ball and a feather on Earth and on the Moon, throw at the angle that goes farthest, push a cart with F = ma, size a pendulum clock, turn a coaster's height into speed, build waves with v = fλ, find a storm by its thunder, and wire circuits with Ohm's law, in simulations you move and run.

3h 02m5 constellations
AT THE SUMMIT, YOU WILL BE ABLE TO

01Explain why everything falls alike without air

02Pick the angle and speed for a throw

03Use F = ma and T = 2π√(L ÷ g)

04Turn height into speed and energy

05Use v = fλ and Ohm's law

Every lesson of Physics, Explained

15 lessons in 5 levels, about 3 hours. Level 1 is free.

Level 1Motion and GravityFree · 3 lessons
  1. Everything Falls the SameSee why a hammer and a feather fall together without air, and how long a fall takes.12 min
  2. Throw It FartherFind the angle that throws farthest, and why two angles can land in the same spot.12 min
  3. Sideways and DownUse the independence of horizontal and vertical motion to predict a throw.12 min
Level 2Forces and SwingsMembership · 3 lessons
  1. F = maPredict how a push and a mass set an acceleration.12 min
  2. The Pendulum ClockFind what sets a pendulum's period, and what doesn't.12 min
  3. Forces in PracticeUse F = ma and the pendulum on real situations.12 min
Level 3EnergyMembership · 3 lessons
  1. Height Becomes SpeedTurn a drop height into a speed, and see why mass and path don't matter.12 min
  2. Energy Changes FormFollow energy from stored to moving and back, and size it.12 min
  3. Motion, Forces and Energy TogetherChoose the right law for each problem: falls, pushes, swings and drops.12 min
Level 4Waves and SoundMembership · 3 lessons
  1. v = fλLink a wave's speed, frequency and wavelength.12 min
  2. The Speed of SoundUse the speed of sound to find a storm's distance and a note's wavelength.12 min
  3. Up-Down or Push-PullTell transverse waves from longitudinal ones.12 min
Level 5Circuits and the Physics TestMembership · 3 lessons
  1. Ohm's LawPredict a circuit's current from its voltage and resistance.12 min
  2. Series and ParallelCombine resistors in series and in parallel, and predict the current.12 min
  3. The Physics TestUse motion, forces, energy, waves and circuits together.14 min
FREE

Level 1 is open.

Membership opens every other level of this path.

See membership
AFTER THE CORE

Keep going where this path leads.

Chemistry, ExplainedWhat things are made of · 3h 03m
The Universe, ExplainedGravity at the largest scale · 2h 59m