Strange Circle collider 2D physics behaviour

Hi,

I faced the strange 2D physics behaviour in my project. All I do is: click GameObject => Create Other => Sphere, then I remove Sphere Collider component in the inspector, add Circle Collider 2D, add RigidBody 2D. Then I create two cubes and replace their Box colliders with Box Colliders 2D. That’s everything I do. You can see how the created sphere behaves on this video: http://madfatcat.com/00/strangePhysics.mov . I didn’t change neither project’s physics settings nor any other sphere gameobject’s settings. Thanks for your help.

Try using physics materials to set the friction and drag of your objects. Also, it looks like you gravity might be a bit low