I am new to AndEngine. I have seen some physics examples from AndEngine Example package. I want to know the role of density, elasticity, friction and gravity while implementing physics. How they effect a physical object in andengine? I know its very basic example but I want to start andengine from very basics. Can anybody make these concepts clear to me?
AndEngine uses Box2D. You can find more information simply by seeing the manual, which includes explanations for the concepts you're asking, here. Specifically, 6.2 :)