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Physics Quest

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Physics Quest

Physics Quest is a free, open school for physics, from first pushes and shadows to relativity and quantum physics, in three languages.

Part of a family of learning platforms with Math Quest, AI Gate and Qubit Quest.

Stages

Explorers
Investigators
Experimenters
Theorists
Scholars
For everyone

Platform

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© 2026 Physics Questg = 9.81 m/s² · c = 299 792 458 m/s

Experimenters · Ages 13–16· λ = 530 nm

Gravity and Orbits

Whirl a ball and cut the string, fire Newton's cannon around a 3D Earth, and launch planets to rediscover Kepler's laws of orbits.

3 lessons 36 min 180 XP

Start the course

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Lessons

1🌀Circular motionGoing round in a circle at steady speed is still accelerating, towards the centre.11 min55 XP
2🌍Universal gravitationEvery mass pulls on every other mass. An orbit is falling while missing the ground.13 min65 XP
3🪐Orbits and Kepler's lawsPlanets move on ellipses, sweep equal areas in equal times, and farther planets take much longer.12 min60 XP

What you'll be able to do

Explain circular motion with a centripetal force, $a = v^{2} / r$ .
Use Newton's law of universal gravitation.
Describe orbits with Kepler's three laws.