Why does my tornado script leave parts hanging in air instead of letting them fall to the ground?

Hi. I am trying to make a Roblox tornado game in the studio, and I made a script that I can't seem to figure out how to get working. The script does pick up things, and it makes them go around the tornado until they reach a certain height, as was intended. But then, it is supposed to let them fall to the ground, but instead, the parts just stay eternally suspended in mid-air. I've tried many different things but I just can't figure it out. Here is the script:

local hole = script.Parent --"hole" is the part that is the tornado
local childList = {}

local massConstant = 5.8

local mass = 32000 * massConstant

function checkObject(obj)
    if (obj ~= hole) and (obj.className == "Part") then
        if (obj.Anchored == false) then
            table.insert(childList, 1, obj)
        end
    elseif (obj.className == "Model") or (obj.className == "Hat") or (obj.className == "Tool") or (obj == workspace) then
        local child = obj:GetChildren()
        for x = 1, #child do
            checkObject(child[x])
        end
        obj.ChildAdded:connect(checkObject)
    end
end

checkObject(workspace)

print("Tornado script loaded.")

local n = 0
while true do
    if n < #childList then
        n = n + 1
        if n % 800 == 0 then
            wait()
        end
    else
        n = 1
        wait()
    end

    local child = childList[n]
    if (child ~= hole) and (child.className == "Part") and (child.Anchored == false) then
        local relPos = hole.Position - child.Position
        local motivator = child:FindFirstChild("BlackHole Influence")
        if relPos.magnitude * 240 * massConstant < mass then
            child:BreakJoints()
            if (relPos.magnitude * 320 * massConstant < mass) and (child.Size.z + hole.Size.x >  relPos.magnitude * 2 - 4) then
                mass = mass + child:GetMass()
                table.remove(childList, n)
                n = n - 1
            else
                child.CanCollide = false
                if motivator == nil then
                    motivator = Instance.new("BodyPosition")
                    motivator.Parent = child
                    motivator.Name = "BlackHole Influence"
                end
                motivator.position = hole.Position
                motivator.maxForce = Vector3.new(1, 1, 1) * mass * child:GetMass() / (relPos.magnitude * massConstant)
            end
        elseif motivator ~= nil then
            motivator:Remove()
        end
    end
end

Can anyone help me?