There are a lot of books written on this topic. You will find this answer if you do your own research.
describe role of physics in science?
How about gravity? A published book entitled The Universe Explained admits that ‘gravity is the most familiar, yet the least understood, of nature’s forces.’ It adds: “Gravitational force seems to travel across empty space instantly, without any obvious means of doing so. In recent years, however, physicists have begun to speculate that gravity might travel in waves made of particles called gravitons. Think about what that implies. Gravity keeps our earth in the right orbit, just the position it should have to allow us to enjoy life here.