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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.

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

Relativity/Lesson 1 of 2

Scholars· 410 nm

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Special relativity: time stretches

Everyone measures the same speed of light, so moving clocks must tick slower.

15 min 75 XP

Step 1 of 11

Bob

In 1905 Einstein took two simple ideas seriously: the laws of physics are the same for everyone moving steadily, and everyone measures light at exactly $c = 299792458$ m/s. Something has to give, and it's time itself.