It is doubtless true that these forces are unknown to you.
Fortunately, their nature is known to some of us, and they are not the same forces. And, no it is not possible to explain the nature of these forces in a few words on an internet forum. But if you spend 4 years at a good university in chemistry and physics, followed by another 3-5 years in graduate school, again in chemistry, physics, and possibly engineering, you may come to have some understanding...
HMMMmmm...
Colossians 1:17
He is before all things, and in him all things hold together.