All labs · 🪐 Physics sandbox
Physics sandbox
Throw, swing, bounce, orbit, crash and fall. Change the numbers and watch real physics – every simulation is a small loop of Python, shown under it.
👋 Free demo: try the first 2 lessons and the first tool. Subscribe to unlock everything here and in all the other labs – USD 10 a month (USD 100 a year), or included with lessons.
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🎯 Missions
- Hit the target (60 m) on Earth.
- Hit it on the Moon throwing no faster than 12 m/s.
💡 Which angle throws farthest? Try 30°, 45° and 60° at the same speed.
🐍 The Python behind it
🎯 Mission: a seconds pendulum
Grandfather clocks use a pendulum that takes exactly 2.00 s to swing there and back on Earth. Find its length!
🐍 The Python behind it
🎯 Mission
Make it bounce exactly once a second (1.00 Hz).
🐍 The Python behind it
Too slow: it falls in. Too fast: it flies away. In between: an orbit!
🎯 Mission: a perfect circle
Find the launch speed that makes a circular orbit, like most planets.
🐍 The Python behind it
🎯 Mission: the snooker stop
Make the blue ball stop dead after the hit, passing all its speed to the red one.
🐍 The Python behind it
🎯 Mission: a safe landing
Land slower than 6 m/s. Watch the graph: the speed stops growing when air pushes back as hard as gravity pulls – terminal speed.