Message from @hgb
Discord ID: 675488747713855508
Imagine Minecraft, gravity would act downwards in that case.
Because a sufficiently far object exerts no force on you.
And you have the same mass uniformly radially around you and under you.
The problem with that is there is a centre of gravity somewhere
There's no problem with that at all.
An infinite plane with uniform mass does not exist
There is
Hehe
It doesn't need to be infinite
Just large enough
It does because then a centre of the object can be found
which is its centre of mass
And force would be uniformly downward.
which is where force would be applied from radially
making it crumple in on itslef
g = GM/r2 correct?
Well no.
Because it has uniform gravitational forces at all places expect its boundaries.
Except.
Unlike the earth
as the mass of such size would create such an immense gravity that it collapses in on itself
Which would have more gravitation at different parts in it.
No. You cant wrap your head around the idea that gravity comes from the centre of mass
which is the object is unifrom
It's like saying: gravity exists therefore the universe must collapse.
so your saying , g = GM , then
it is the centre of the object
boy xD
It would be insignificant at large distances
So it would be uniform
The centre is still the centre
Perform an experiment. Have a large plane perpendicular to the earth, place an object near it, see where the gravitational force acts on that object.
You're saying it would be towards the centre of the plane.
I'm saying it would be horizontal
Because centre of mass doesn't account for shape of the object
So it's a crude approximation.
There is an experiement you can do to test the centre of mass. You hold a ruler over the edge of the table and find the exact point where it doesnt topple over. Now repeat this on top of the previous ruler over and over again until you have a ruler of the edge of the desk
each time you have found the centre of mass
You're not understanding what I'm saying.