If the rigidbody has friction, how do I adjust or turn it on?
You can make a ‘Physics material’ by right clicking on Assets > Create > Physics material. From there you can alter it as you please.
To assign it, select your game object and assign your new material to the ‘Material’ section of that game objects ‘collider’
The mass slider works as a friction slider. The less mass, the farther an amount of energy will change something.