Fb = ρ · V · g
ρ (rho) is the density of the fluid
V is the volume of the fluid displaced by the object
g is the acceleration due to gravity (approximately 9.81 m/s² on Earth)
The reason the density of the water matters and not the density of the cube in the buoyant force equation is that the buoyant force depends solely on the properties of the fluid in which the object is submerged, not on the properties of the object itself.
The density of the cube does not affect the buoyant force directly but it determines whether the object will float or sink.
If the density of the cube is less than the density of the fluid, the object will float because the buoyant force will be greater than the gravitational force acting on the object.
If the density of the cube is greater than the density of the fluid, the object will sink because the gravitational force will be greater than the buoyant force.
Steven’s Law of Flat Earth Universal Gravitation
(Densisty x Volume x (2Height / Time^2))
Gravity on Flat Earth is just F = ma. Newton’s Law of Universal Gravitation is psuedoscience since it requires a special constant to be added to the formula. My formula is more accurate since there is no constant required to offset the final value to make it work.
Fg = Density x Volume x Acceleration
Acceleration = 2h/t^2
= 2 x 5m / 1.02s^2
= 10 / 1.02
= 9.8 m/s/s