Unity 5 comes with the advancement and new approach. In Unity 5 there is no need to set physics manually but you do need to set max angular velocity of the object through coding individually . By doing this you can set max angular velocity to selected objects and not in all the objects in unity .
In this way you can set maxAngularVelocity to any particular object and making it Rotate/Spin forcefully and appearing it real.
Note:Refer to Chapter 1: Rotate a object about its axis using force in unity 4 /5. and Chapter 2: Rotate a object about its axis using force in unity 4 /5 for more details.