Corona has made it convenient to add physics to your games, especially if you've never worked on one before. The engine uses Box2D and takes only a few lines to incorporate it into your application than what it normally takes to have it set up.
Working with the physics engine in Corona is fairly easy. You use display objects and set them as a physical body in your code. Images, sprites, and vector shapes can be turned into a physical object. This is substantial in visualizing how you want your objects to react in an environment you have created. You can see results right away rather than guessing how they might act in a physical world.
Making the physics engine available in your app requires the following line:
local physics = require "physics"