>>2521692just a quick-tip for half-assed physics: after you create main rigid bodies (lower body, upper body, head etc.)
double click on starting bone in the chain of bones to select whole chain (i.e. hair) and then just push create body/physics button, then go to joints tab and there will be one empty joint (not connected to anything) with this joint connect the upper hair body with the head body repeat process for every other chain