Message from @hgb
Discord ID: 675490147030269952
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.
I'm not trying to find where the center of mass is
now suggesting that the ruler is uniform of density then why doesnt the gravity topple the rulers?
Okay okay okay
If I have a very long ruler
I put an object next to it
Do you think the object will be attracted to the ruler or its centre
Aka.
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First of all. The centre of mass definitely is affected by shape just look at the toys that use this effect as a gimmick
Well duh
The centre
But I'm saying
like ive been saying
Which is obvious
what do you mean?
You can only use centre of mass to estimate gravity when the object is like a point mass
> 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.
@hgb Is this plane got more mass then the earth. If so the earth will be attracted to the plane. Also this plane woult crumple in on its centre of mass to create a sphere
Near the dead centre of the earth, the prediction of the centre of mass gravity would be very very very large, in reality, it's close to zero.
Ok you're still not getting my point.
The centre of gravity isnt used to calculate the centre of mass ever. It shows where gravity will be in effect
Lmao
Okay.
You're at 5 meters away from centre of the earth
ok
How much gravity force would there be on you
Would it be larger than or smaller than g
larger
following inverse gravitational square law
That's what the centre of mass method predicts, right?
no?
i just told you
But in reality, if you're there, obviously, your gravity would be less than g
the inverse gravitational law