how does hyrid motor work?

There are some that still argue that they don't. :-)

Anthony J. Cesaroni President/CEO Cesaroni Technology/Cesaroni Aerospace

These web sites will help you:

Hybrid: A type of reusable rocket motor in which the fuel and oxidizer are kept separate and in different material states (such as a compressed liquid and a solid) until combustion occurs. A typical hybrid motor currently uses nitrous oxide gas as an oxidizer, and cardboard or plastic as fuel.

And maybe this one ;)