Before posting in this thread, note that science and physics are mostly
composed of theories for the things they don't yet fully know, like in the case
of gravity. Which means some theories are inadequate when it comes to
explaining it properly, let alone practical application.
Science means working knowledge, but as evidenced by the current culture
of computer users you don't have to have full working knowledge of a thing
to be able to discuss it or use it. You could even make a thing without understanding
it fully, in science and physics the explanation often follows after new inventions or discoveries have been made.