I have taken 3 classes on physics and understand that fundamental scientific discipline.
Wow, you must be really smart! What are some things that you've learned about in your physics classes?
The main focus of physics is understanding how the universe behaves.
So you must have learned a lot about things like matter, energy and momentum! Is there a lot of math involved in physics? 
Physics is one of the oldest perhaps even the oldest academic focus with the inclusion of astronomy, the inclusion of mathematics came later.
I think astronomy is fascinating! It's astounding how big our universe really is. 
Physics intersects with many different branches of study including biophysics and quantum chemistry. The boundaries are not rigidly defined.
You must spend many hours studying! What kind of jobs can someone who studies physics hope to get?
Anything you want you can use your powers to understand electromagnetism, nuclear physics, television, computers, calculus.
I had no idea, the subject area was so broad! Who were some famous physicists that I might have heard of?