PhysicsGeneralQuality 84 · Exceptional
Why Gravity Is Weaker on the Moon
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Gus Ibarra Verified Teacher
@author · 2026-07-19 · v1
7 min read
Gravitational acceleration depends on mass and distance:
. The Moon has about 1/81 of Earth's mass and 1/4 of its radius, so its surface gravity is roughly 1.6 m/s² compared to Earth's 9.8 m/s². This is why astronauts could leap high despite wearing heavy suits — the downward pull was about six times weaker.
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Zara Ahmed
23 days agoThe line "Gravitational acceleration depends on mass and distance: " is the part that finally made it click for me. I'd been fuzzy on gravitational before — seeing it spelled out this way connects it to acceleration in a way my notes never did. The bit is a nice touch too.
Theo Andersson
23 days agoYeah, the gravitational point is exactly right. I'd add that acceleration matters here too — if you drop it, the astronauts case breaks down even though it *looks* optional. Learned that the hard way on a problem set last week.
Diego Fernandez
23 days agoQuick question on gravitational: does that also explain what happens with acceleration? My textbook mentions both but never ties them together, and this explanation of astronauts makes me think they're the same mechanism from two angles.
Amara Okafor
23 days agoAdding to this: "Gravitational acceleration depends on mass and distance: " also generalizes to acceleration. I tried it on astronauts and the same logic holds, which makes me think gravitational is the deeper principle behind all of them. The detail is what trips people up though.
Hannah Kim
23 days agoWhat stood out is "The Moon has about 1/81 of Earth's mass and 1/4 of its radius, so its surface gravity is roughly 1.6 m/s² compared to Earth's 9.8 m/s²" — most resources skip the *why* and just give the formula. Adding acceleration to the picture is what makes gravitational feel like a real tool instead of trivia. Saved this one.