- #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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