The model uses approximate surface gravitational accelerations: Earth 9.8, the Moon 1.6 and Mars 3.7 metres per second squared. A two-kilogram object therefore weighs about 19.6 newtons on Earth. Its mass remains two kilograms when moved to either of the other worlds shown.
Space · Discover & try
Would the same object weigh less on the Moon?
Reading level 3 of 5 · IndependentChange
Word help
Mass
A measure of matter and resistance to acceleration, in kilograms.
Weight
The gravitational force on an object, in newtons.
Gravitational acceleration
The local factor g relating mass to gravitational weight.
Watch · Try · Explain
See how it works
The interactive activity is loading.
Near-surface force comparison using rounded NASA values; not a model of orbit or apparent weightlessness.
What to look for
- Keep the kilogram label fixed while changing worlds.
- Compare force-gauge readings and extension on the same calibration.
- Double mass on one world.
Explain what you noticed
A three-kilogram instrument is moved from Earth to the Moon without losing any parts. What changes?
Keep this idea: Mass stays the same when location changes; weight depends on local gravity.
Follow the sources
Source material checked 2026-10-29. Explanations and activities by Nepedia. Source links do not imply endorsement.
Keep following the idea
Next discovery →