I have a problem with 2D terrain, help mee!

Hi guys, I'm a developer novice on unity, my problem concerns the movement of a player on a mobile ground. This is my test scene, only for test and resolv this problem.

The player for test is a pink sprite, with rigidbody, and the terrain is grass with rigidbody. The script of each block of terrai move it to the left with this istruction on Fixed Update:

void FixedUpdate()
    {
        gameObject.GetComponent<Rigidbody2D>().velocity = (Vector2.left * speed);
    }

This work great, but the player moves along the ground to the left, but I would like that the player would remain in his position. I do not want to remove the rigidbody on the terrain and on the player, and i do not want to use the "transform.Translate", because this instruction need to perform a recalculation of physical contact, and it makes the poorly performing program.

Do you have any idea to solve this without using freeze constraints? Thanks in advance :)

The rigidbody are all 2D