- #1
Steven Hansel
- 15
- 1
Homework Statement
Why does gravity force decreases below Earth's surface?
Homework Equations
F = G (m1 m2)/r^2
F = force of gravity
G = Universal gravity constant
m1 and m2 = mass of the objects
r = distance between two objects
g = GM/r^2
g = gravity of the object
G = universal gravity constant
M = mass of the object
r = distance/radius between two objects
a = g
g1 = g0 (1-h/r)
g1 = gravity below Earth surface
g0 = gravity in the Earth surface
h = height of the object
r = distance between two objects
The Attempt at a Solution
I'm really confused on why does gravity force decreases below Earth's surface. Gravity becomes stronger when the radius/distance become shorter between two objects. Now, an object is getting shorter radius/distance to the planet why the gravitational force decreases? Isn't it supposed to be stronger? I looked up at the internet and it said "The body will be attracted by the mass of the Earth which is enclosed in a sphere of radius (R - h)" Does this mean that gravity decreases because there are mass in that enclosed sphere?
So, will the gravitational force increases if i create a really deep hole below Earth surface and put an object into the deep hole?
Thanks for answering beforehand!
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