How to make BreakJoints() work when part1 touches part2 and BreakJoints() happen to part2?

wait(5)
	--x = 5 --ignore
	hi = Instance.new("Part")
	hi.Parent = game.Workspace
	hi.Shape = "Ball"
	hi.Transparency = .5
	hi.BrickColor = BrickColor.new(Color3.new(255,175,0))
for i = 1,10,1 do
	wait(.1)
	hi.Size = Vector3.new(i,i,i)
	--hi.Size.Y = i --ignore
	--hi.Size.Z = i --ignore
	ha = game.Workspace:GetChildren()
	ha:BreakJoints()
end

Says the line 14 is not working?

:GetChildren() Returns a table. I Would recommend looping through the table. Like so

for int,val in pairs(ha) do -- this steps through each value in the table int == the number and val is the value.
if val:IsA("Model") then -- I am pretty sure models only work with breakjoints, i will look into it.
val:BreakJoints() -- do it
end
end-- close it all up

If you want to break joints in everything in workspace then try:

for i,v in pairs(workspace:GetChildren()) do
	if v:IsA("BasePart") then
		v:BreakJoints()
	end
end

although I don't know why you would want this. Its just that, from your code this looks like what you are trying to do.