An interesting little science fact

[hjo3]

Did you know the force of gravity actually increases as you move deeper into the Earth up to a certain point? 3,550 miles from the core it's 1.02 Gs; 2,150 miles from the core it's 1.09 Gs. Wacky, huh?

 

[simms]

Just like if you go away from the earth, like on top of a mountain, gravity is less? :shocked:

 

[Bozono]

So that's why my schlong is larger when I sit on the floor. Hmmm.

 

[Ricemarine]

Just like how if you go to the moon, you don't get touched by it? :laugh:

 

[tfcmasta97]

... you expected what now?

 

[Fenixgoon]

yes i did... F = G m1m2/ R^2, where G = constant (don't remember value), m1 = mass 1, m2 = mass 2, r = distance between them

 

[hjo3]

Originally posted by: tfcmasta97
... you expected what now?

Most people would expect gravity to decrease as you move towards the center of the Earth... after all, at the core, it's effectively 0 G (or close to it).

 

[KillerCharlie]

Originally posted by: Fenixgoon
yes i did... F = G m1m2/ R^2, where G = constant (don't remember value), m1 = mass 1, m2 = mass 2, r = distance between them

BZZZZZTT! Nice try, but no. He's talking about going INSIDE the earth.

 

[Saint Nick]

G = 6.67 x 10^-11 Nm^2 / kg^2

 

[Powermoloch]

duh...of course...the more closer you get to the center...the higher it is...isn't it? same as for pressure and temperature.

 

[Random Variable]

At some point the force of gravity will begin to decrease as you dig deeper because m1 will keep getting smaller and smaller.

 

[Connoisseur]

Originally posted by: hjo3

Originally posted by: tfcmasta97
... you expected what now?

Most people would expect gravity to decrease as you move towards the center of the Earth... after all, at the core, it's effectively 0 G (or close to it).

Actually.. if you assume that the earth is a perfect sphere, there is 0 net force anywhere INSIDE the earth. Using F= Gm1m2/R^2, you gotta take into account that there's mass on all sides of you. Turns out that in a sphere with uniform mass distribution the mass1/R1^2 on one side perfectly counteracts the mass2/R2^2 on the other side of any point of reference within the sphere. Obviously, since the earth is not a perfectly uniform sphere (core, mantle, crust), this will not hold true.

 

[Connoisseur]

Originally posted by: Random Variable
At some point the force of gravity will begin to decrease as you dig deeper because m1 will keep getting smaller and smaller.

No. In "theory", once you're inside the "sphere" of earth, net gravitational force is 0. But as I mentioned in my previous post, since the earth is not a uniform sphere, this will not technically hold true. However, gravitational force does not uniformly decrease the further you go in. It's just not how physics works.

 

[imported_Tick]

Actually, the REAL effect here is density. The earths core is far more dense, and thus gravitates more strongly, than the surounding rock. Thus, closer to the core, you get the greater density gravatational field, due to closeness, however, at some point, the gravity lost due to having less total mass counteracts that.

 

[KillerCharlie]

 

[imported_Tick]

Originally posted by: Tick
Actually, the REAL effect here is density. The earths core is far more dense, and thus gravitates more strongly, than the surounding rock. Thus, closer to the core, you get the greater density gravatational field, due to closeness, however, at some point, the gravity lost due to having less total mass counteracts that.

This is not to say that any other posts were wrong, just that they aren't relevant in this instance.

 

[imported_Tick]

Originally posted by: KillerCharlie

Why did you edit to a blank post?

 

[hjo3]

Originally posted by: Powermoloch
duh...of course...the more closer you get to the center...the higher it is...isn't it? same as for pressure and temperature.

Pressure and temperature, sure -- gravity's different. 750 miles from the core it's only 0.45 Gs, for example.

 

[imported_Tick]

Someone should do some googleing and find the precise equation for gravity on earth.

 

[KillerCharlie]

Originally posted by: Connoisseur

Originally posted by: hjo3

Originally posted by: tfcmasta97
... you expected what now?

Most people would expect gravity to decrease as you move towards the center of the Earth... after all, at the core, it's effectively 0 G (or close to it).

Actually.. if you assume that the earth is a perfect sphere, there is 0 net force anywhere INSIDE the earth. Using F= Gm1m2/R^2, you gotta take into account that there's mass on all sides of you. Turns out that in a sphere with uniform mass distribution the mass1/R1^2 on one side perfectly counteracts the mass2/R2^2 on the other side of any point of reference within the sphere. Obviously, since the earth is not a perfectly uniform sphere (core, mantle, crust), this will not hold true.

You are 100% wrong. There is force inside of a constant density sphere. Do the calculus yourself. It is only inside a spherical SHELL that there is no force.

 

[imported_Tick]

Originally posted by: KillerCharlie

Originally posted by: Connoisseur

Originally posted by: hjo3

Originally posted by: tfcmasta97
... you expected what now?

Most people would expect gravity to decrease as you move towards the center of the Earth... after all, at the core, it's effectively 0 G (or close to it).

Actually.. if you assume that the earth is a perfect sphere, there is 0 net force anywhere INSIDE the earth. Using F= Gm1m2/R^2, you gotta take into account that there's mass on all sides of you. Turns out that in a sphere with uniform mass distribution the mass1/R1^2 on one side perfectly counteracts the mass2/R2^2 on the other side of any point of reference within the sphere. Obviously, since the earth is not a perfectly uniform sphere (core, mantle, crust), this will not hold true.

You are 100% wrong. There is force inside of a constant density sphere. Do the calculus yourself. It is only inside a spherical SHELL that there is no force.

I shoulda caught that. GJ.

 

[Random Variable]

Originally posted by: Connoisseur

Originally posted by: Random Variable
At some point the force of gravity will begin to decrease as you dig deeper because m1 will keep getting smaller and smaller.

No. In "theory", once you're inside the "sphere" of earth, net gravitational force is 0. But as I mentioned in my previous post, since the earth is not a uniform sphere, this will not technically hold true. However, gravitational force does not uniformly decrease the further you go in. It's just not how physics works.

I believe that principle applies to a hollow sphere.

 

[PowerEngineer]

Originally posted by: Tick

Originally posted by: Tick
Actually, the REAL effect here is density. The earths core is far more dense, and thus gravitates more strongly, than the surounding rock. Thus, closer to the core, you get the greater density gravatational field, due to closeness, however, at some point, the gravity lost due to having less total mass counteracts that.

This is not to say that any other posts were wrong, just that they aren't relevant in this instance.

Oh, come on... some of the other posts are wrong!

 

[BrokenVisage]

Originally posted by: Tick

Originally posted by: KillerCharlie

Why did you edit to a blank post?

haha

 

[KillerCharlie]

Newton invented integral calculus to prove this stuff.

http://www.yale.edu/phys180/lecture_notes/180_Lect_31/sld007.htm