You could do all that, or just use Phsysic Materials and put them in the colliders of the Terrain.
In a Physic Material, you can define the amount of friction applied to object sliding across the collider :)
[http://unity3d.com/learn/tutorials/modules/beginner/physics/physic-materials][1]
Of course, if the situation is more complex, you can use the above answers instead ;)
[1]: http://unity3d.com/learn/tutorials/modules/beginner/physics/physic-materials
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