Similar to my tutorial about creating a Dynamic Joint Chain, this video demonstrates and explains how one might control an nHair curve and how to have it influence a mesh using the Wire Tool, instead of using a joint chain. It also explains how to define collisions, relative to the radius of the geometry being controlled by the dynamic curve in Maya 2013. (25 min).
More Maya tools and technique discussion are available in my interactive iPad books about rigging and production tools in Maya. itunes.apple.com/us/artist/jeremy-a.-parrish/id507724058?mt=11