You can create as many custom Physics MaterialA physics asset for adjusting the friction and bouncing effects of colliding objects. More info
See in Glossary assets as you need, and apply them to colliders in your scene.
Several colliders can have the same Physics Material asset assigned to them, and you can set a project-wide default to apply new default settings to all colliders in the project.
To create a Physics Material asset, go to Assets > Create > Physics Material. By default, Unity places new Physics Material assets in your Assets directory.
You can create as many custom Physics Material assets as you need. Physics Material assets have the file extension .physicMaterial.
To apply a Physics Material asset to a collider:
Alternatively, you can click and drag the Physics Material asset file directly from the Project window onto the target collider’s Material field.
Each collider can only have one assigned Physics Material asset at a time. You can assign the same Physics Material asset to multiple colliders.
You can use a custom Physics Material asset to replace the project-wide default settings. Unity applies the project-wide default settings to any collider that does not have an assigned Physics Material asset.
To change the default Physics Material values: