All objects of any mass and density greater than that of air
Again, density doesn't explain it.
Density provides no reason for the directionality, nor the rate, nor why it should move at all.
You need something else.
they are first put up
Again, if something is put to the right, it doesn't fall to the left.
Origin does not explain it either.
Stop just repeating the same refuted BS and try to come up with something original.
requires no force at all
The object accelerates. That demands a force.
let alone two forces
You mean a force and a direct result of that force?
With that second force clearly demonstrable from measurements of the pressure gradient, and observations of how pressure interacts with objects.
like you must have to explain your story of a ball Earth speeding through space.
Again, if your delusional BS worked, it would work BETTER with a RE.
We use gravity to explain what is observed, to actually explain it.
You still don’t understand why things should always fall from the air downward
Because you refuse to explain it.
And all your attempts to do so are just repeating the same refuted BS.
At first, do you understand that all things are on the surface, have always been known to be on the surface, and that nothing has ever come from above the surface from elsewhere, and was ever ‘pulled down’ to the surface by your made up force?
Except for plenty of things which do which you just dismiss as fake.
So you start your explanation with a lie and wilful ignorance of reality.
That explains why everything exists on the surface
No, it is a baseless assertion that things magically exist on the surface. There is no explanation for why they exist on the surface, nor any evidence for their origin on the surface, nor any explanation for why moving it off the surface makes it go down, nor why the surface is magic so it is only moving upwards that is an issue.
Especially given the fact you can break something off an outcrop, moving it down and it falls away from the surface.
There is NOTHING indicating anything magical about the surface.
Objects do not fall to the surface.
They fall DOWN!
Mass is good since it holds us down to the surface
Only thanks to gravity.
We must be put in one direction to go upward, and one opposite direction downward again. They are both single directions, not only one going downward.
Just like left and right.
Is the relative density of the object to the medium of air and water.
Due to gravity, including that it causes a pressure gradient which acts to push objects up in a fluid.
That is the reason here, nothing difficult to understand.
What is missing is why anything should move at all.
Why should being denser make it go down?
Again, density has no directionality.
It provides no reason at all.
And going to the surface is clearly not what happens.
Your made up force cannot use relative mass
Our real force CAN.
Do you know why?
Because if you consider a column of fluid, with a cross sectional area A, with a height of h in a gravitational field of g with a density of rho_f; then the mass of the fluid is rho_f*A*h.
And the force due gravity is rho_f*A*h*g.
If the pressure at the top of the column is P_T, then there is a force pushing the top of the column down of P_T*A.
That means the force at the bottom, needing to support it is:
P_T*A+rho_f*A*h*g = A*(P_T+rho_f*h*g).
So the pressure at the bottom, pushing up is A*(P_T+rho_f*h*g)/A = P_T+rho_f*h*g
This means the pressure differential is rho_f*h*g.
Notice that this does not depend upon the area.
Instead, it depends upon the density of the fluid, the height of the column and g.
And the nice thing about fluids is they are hydrostatic, so they will try to equalise pressures.
So if you have an object immersed in a fluid, that pressure differential in the fluid (in hypothetical static conditions where the object is fixed in place) will be equal to that for the fluid itself as if that object wasn't there.
So we now consider an object immersed in a fluid.
The object has a cross sectional area of A, a height of h and a density of rho_o, so a mass of A*h*rho_o.
Because it is in the fluid, the fluid will have a pressure gradient across it, the pressure at the top is P_T. The pressure at the bottom, as shown above, is P_T+rho_f*h*g.
We can multiply both by the area to get F_T = P_T*A, and F_B = A*(P_T+rho_f*h*g) = A*P_T+A*rho_f*h*g.
In addition to that, we also have the force of gravity on the object. That is given A*h*rho_o*g.
When we add these together, we need to be careful of sign. I will treat a downwards force as positive and an upwards force as negative.
So the downwards force from the pressure at the top and the downwards force due gravity is positive, and the upwards force from the pressure is negative.
So the net force on the object is:
F=P_T*A + A*h*rho_o*g - (A*P_T+A*rho_f*h*g)
F=P_T*A + A*h*rho_o*g - A*P_T - A*rho_f*h*g
F=A*h*rho_o*g - A*rho_f*h*g
F=A*h*g*(rho_o - rho_f).
Notice a key part here?
The force is proportional to the volume of the object, and the difference between the density of the object and the density of the fluid.
If the density of the object is greater, the object goes down.
If the density of the object is less, the object goes up.
So yes, we CAN use relative density, as that is exactly what is expected for gravity.
nor does your other made up force save your story
You mean the other real force, which is a direct consequence of the first real force (gravity), which is proven to exist beyond any doubt and you can directly measure the pressures involved to measure the pressure gradient.
A combination of 2 forces which explain what is observed so well; which you cannot show a fault with and instead need to ridicule and baseless assertions?
Just why do you think these 2 real forces cannot save reality?
there is no second made up force pushing them upward in air
i.e. you are entirely ignoring an empirically verifiable pressure gradient or the countless experiments which clearly demonstrate that pressure gradients push from high pressure to low pressure.
i.e. you are choosing to be wilfully ignorant of reality to try propping your delusional BS.
Buoyancy is a made up force that also fails to work.
Why?
Can you show any fault with it at all?
No. You can just repeat the same pathetic claim that it doesn't work.