No, it isn't mass, it is weight.
Mass has no directionally, weight does.
If there was no force (i.e. gravity) trying to pull the mass down, the bridge wouldn't need to support anything.
After it is put upward into air, it should stay in air, you mean? Or it should move around in any direction, not just downward through the air, after being PUT UP into air, where it never WAS until it was PUT UP into air? Or after it is PUT UP INTO AIR, from the ground, where it always has existed, for over 10000 years at least, before anyone was here to see it land down on Earth from 'space', same as never seeing any object on Earth come down from 'space', except for 'meteors', that is, which is the only object ever 'known' to land down on Earth from 'space', which we say is an endless area beyond the Earth, without any proof for it!
Why do you think it is constant?
You keep repeating this delusional BS, when it has been refuted multiple times.
g varies around Earth and with altitude.
It is not constant, it is just approximately 9.8 m/s^2.
For most calculations, you can use 9.8 m/s^2.
But if you need them to be very precise, you need a more accurate value, and can't just use that "constant", as that constant is an approximation.
You're sure it is NOT a constant, while it is actually stated here, and other documents, as measuring at this exact rate, of 9.8 m/s^2, which you believe is NOT accurate, or not everywhere on Earth, anyway?
Right, so they're posting an actual rate, of a made up magical force, even though it might not be accurate at all, but they still post as if it WERE an actual measurement? Is that what you're telling me here?
Good one.
Actual forces (like gravity and electromagnetism) have a constant of proportionality, describing the relationship between the force and what the force is based on.
But this matches gravity, where for example the gravity of Earth is strongest when closest to Earth and gets weaker as you go further away from Earth.
You keep on claiming that it gets 'weaker' with more distance, but it's always the very SAME rate of fall in air, same rate of acceleration in falling through air, same maximum SPEED of fall in air, from any altitude above your magical force's 'source', which you claim is the Earth itself.
When we are ON the surface, and fall down, it is no different than when we fall from 10000 feet above the Earth, which is confirmed by having the same RATE of fall, and is measured as the same, as a CONSTANT rate of fall.
If it was NOT a constant rate, as you claim, then it is a VARIABLE rate, and NOT a constant.
They would NOT state this figure as being the 'rate of gravity', or 'rate of acceleration', or so forth, if it was a VARIABLE rate, no matter how SMALL it varies, no matter WHERE it varies! And they would also GIVE us that different rate, or rates, too!
You mean like how gravity applies a much larger force to a more massive object than it does to a lighter object?
And how would you PROVE that your made up 'force', applies more force to heavier objects, in air, than to lighter ones in air?
Because the heavier object has more force when it hits the surface, than a lighter object does? And you attribute a heavier object having the exact same rate of fall in air, and same MAXIMUM rate of speed, as any LIGHTER object in air, as....what? If a heavier object is 'pulled down from air', at the same speed of fall as all other objects are, they must be falling equally, as if they are one and the same thing, when falling through air.
But if it was due to your magical force, a heavier object would not fall at the same rate, or same maximum speed, or same rate of acceleration, as a lighter object would. That's how actual forces act, they move some objects, and cannot move other objects, because they are HEAVIER, or slightly move objects which aren't as heavy, or they are less dense, or so forth.
The fact is, forces act differently on some objects than they do with other objects, and are always weaker with more distance from their sources, which is always MEASURABLE as being weaker, with more distance away from their sources.
You believe there's an actual force, which acts like all other actual forces do, is variable in strength like all actual forces are, which is proven to exist like all actual forces have been proven, are consistent in how they act and behave, like all actual forces do, and so on.....
But in fact, your 'force' seems to be the very OPPOSITE of actual forces, in every way possible.
Not just because it has no proof of even EXISTING at all, but everything else is not the same as actual forces, either. You couldn't make up a WORSE 'force', if you tried to! It's totally unlike actual forces, in every way possible.
Which provides no reason for them to move in any particular direction.
They are heavy because there is a force trying to move them towards Earth.
If you wish to keep in the air (without them being in orbit), you need to apply a force to keep them there to resist the force of gravity.
Why would they ever BE in air, to begin with? You think they just EXIST in air, because you think they shouldn't only fall downward through the air, AFTER THEY ARE PUT UPWARD INTO AIR? Why would THAT be? If they were NOT is air, until they were PUT UP INTO AIR, what do you think they should do, from that point? Hover in air? Move up or down or anywhere at all, but not always in the SAME direction, which cannot happen unless they are 'PULLED DOWN' by some magical force within Earth?
You cannot claim some object is in air, unless you PUT IT INTO AIR FIRST OF ALL!
If you said, 'when a car is moving at 100 mph', or 'when a plane is flying at 400 mph', you're ignoring everything that HAS TO HAVE HAPPENED, BEFORE GETTING TO THAT POINT.
It's very easy to understand that, right?