Line is not Affected by Physics

Hello everyone! I am building a bridge building game. When building, user draws lines and these lines have weight.

I created an empty gameobject and added Linerenderer to it. I wrote the coordinates and chose the material. Everything is OK. But after i add rigidbody, give it a mass and check "Use Gravity", I press play. Line should fall but it's not falling. Transform values change but line is at same position.

How can I do this? Draw a line that has a weight value and it falls if idle.(is affected by physics rules)

And also i want to add collider to the line after i do this.