BOUND AND UNBOUND TRAJECTORIES

In my very first post,i would like to answer some basic questions on physics.

1)what is physics?

Physics is the scientific study of matter and energy and how they interact with each other. This energy can take the form of motion, light, electricity, radiation, gravity . . . just about anything, honestly. Physics deals with matter on scales ranging from sub-atomic particles (i.e. the particles that make up the atom and the particles that make up those particles) to stars and even entire galaxies.

2)where it comes from?

let we first know about "SCIENCE" .it comes from a latin word scientia which has the meaning 'TO KNOW' .And physics comes from greek word FUSIS (NATURE) . In short we can say that "TO KNOW ABOUT NATURE IS PHYSICS " .