Do we study the true nature of the universe or reality or just create a model(mathematical) to get approximation close enough to our use? whether they have to do any thing with reality or not. I have few statements that i have seen from other answers which confuses me more. i do not know whether i have wrong concept of physics in my mind or not. please clarify this concept in intuitive way and use simple worlds that a high school student can understand and below are those statements.
Don't be surprised that physics has a lot of definitions that are circular. Ultimately, we are just describing the universe.
Work and energy have been defined in a certain way in newtonian physics to explain a kinematic model of reality. This is a model, not reality - you will find no such thing in reality. However, in many scenarios, it is close enough to reality to be useful. and
Physics is limited in offering only mathematical descriptions of the universe. The models which are created are dependent on the math and offer a sort of intuition behind the phenomena