Upthrust (or buoyant force) depends on the acceleration due to gravity, but not in a direct or proportional way. The buoyant force is given by Archimedes’ principle, which states that the upthrust acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.
The formula for upthrust (buoyant force) is:
Fbuoy=ρ⋅V⋅g
Where:
- is the buoyant force (upthrust),
- ρ is the density of the fluid,
- V is the volume of the displaced fluid,
- g is the acceleration due to gravity.
So, while upthrust does depend on g (because gravity influences the weight of the displaced fluid), the upthrust force increases as gravity increases, since it’s directly proportional to g.
In different locations (such as on Earth vs. on the Moon, where gg differs), the upthrust would change accordingly. However, for typical Earth-bound scenarios, this change in upthrust would be relatively small since gg is nearly constant.