What exactly is Physics?

First question that came into my mind, “Is physics a subject that produced facts that are fixed and all the information that we gained from text is nothing but the truth? Unfortunately, the information that we acquired in school are only part of the knowledge gained or found over the last 2000 years! To date, we may have taken for granted that such information is true and nothing can change.

Physics is not a hard factual subject for which the subject is fixed. In fact, research has been done to date and still in progress. What we found in physics are theories that are created by many physicists over many centuries. Why these theories seem to be stone-carved in texts? This is because these theories predicted results which matched with the experimental results. If such theory can be used to predict to the accuracy of 0.0000000001 plus or minus error, we could use this theory to apply to engineering fields like aerospace, civil, robotic and many more. This is where the theories are used in real world! Example of theory which still works to date is Newton’s 3 laws, conservation of energy, laws of Thermodynamic etc.