Trail · 5 stops

From falling apples to satellites

How one force explains why things fall, why the Moon circles Earth, and how we put satellites in orbit: five stops through Newton's physics.

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1. 1
   Newton's Laws of Motion

   Three rules that explain how every object moves: inertia, force equals mass times acceleration, and every action has an equal and opposite reaction.

2. 2
   Gravity

   The attraction between all masses. Why it weakens with distance, why the Moon 'falls' around Earth, and how it creates tides and keeps planets in orbit.

3. 3
   Orbits

   An orbit is a path where one object keeps falling around another without ever hitting it. How orbits work, what shape they are, and how fast they go.

4. 4
   Kepler's Laws

   Three rules for how planets move: in ellipses, sweeping equal areas in equal times, with bigger orbits taking predictably longer (P² = a³).

5. 5
   Satellites

   Anything that orbits a planet, natural like the Moon or artificial like Sputnik: how they stay up, how fast they travel, and what we learn from them.