2 object collision

i have 2d game :
i have 2 circle in the scene i add (circle collider 2d) (rigidbody 2d) to both ,
i give one from the circle script that move towards the other ball but that cause to be no collision when the ball Meet
, any Suggestion to make the ball Collide

Are both ridgedbodies set to be kinematic? Try unchecking isKinematic on one or both to see the shapes react when hitting.