1. The problem statement, all variables and given/known data Why does gravity force decreases below earth's surface? 2. Relevant 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 3. 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!