Weight on Other Worlds

g = GM/R²

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Surface gravity $g = GM/R^2$: more mass pulls harder, a bigger radius pulls weaker.
• Mass is the same everywhere. Weight = mg changes from world to world.
• Measuring G made it possible to weigh the Earth.

Steps

1. Jumping on the Moon
2. Surface gravity
3. Weigh yourself on Mars
4. Double planet
5. A jump on a small world
6. Weigh Mars