How to make randomly bouncing balls?

Unity Engine
1

I would like to make a game with randomly bouncing baseball ball. Here is a sample view of the game:

I assigned circle collider 2D and rigidbody 2D components to the ball and then I added the physics material 2D. However, the ball is falling down infinitely due to the rigidbody 2D as I cannot move the ball without selecting the body type of the rigidbody 2D as dynamic. When I remove the rigidbody 2D component, the movement of the ball stops. So I am not sure what the other components do.

Would you please lead me how can I make these kinds of bouncing balls? What kinds of components do I need and how to write its script?

Thank you for your time.

2

You need to add some type of Collider2D component to your ground, otherwise your balls have nothing to bounce off of, which is why they just fall forever.