   2d physics
  What would be a good physics library to pair with SFML?  I want something that would make collision detection easy and have features like gravity, etc.  I don't need anything state of the art.Thank you.   
Box2D seems to be a popular 2D physics solution. Beyond collision detection, it lists the following features:- Continuous physics with time of impact island solver. - Persistent body-joint-contact graph - Island solution and sleep management - Contact, friction, and restitution - Stable stacking with a linear-time solver - Revolute, prismatic, distance, pulley, gear, and mouse joints - Joint limits, motors, and friction - Momentum decoupled position correction - Fairly accurate reaction forces/impulsesCheers,Tim;  Well, I figured Box2D would be mentioned, but I was hoping there was something a little more light weight.  Box2D is a great engine, but it's fairly bloated for what I need.  However, I havn't heard of any other popular 2D physics engines.   ;Chipmunk? You could always check one of the various lists of libraries around and look through the physics section...   ;  Besides Entangular (which is XNA specific and is actually networking + physics), the only other options I've found are Chipmunk, Flatland, and PMASK, all of which are just collision specific.Of the above solutions, PMASK may be the most lightweight. If you do find anything beyond these, please post and let us know, and I will add it to my database. :)Cheers,Tim   ;  Chipmunk looks great.  It doesn't appear to great documentation, though.  I'm sure I'll manage.  Thanks for the input.   