Joint2D Tutorials

Hi all,
I’m trying to look around to find a striaght-forward tutorial on 2D physics (4.3) and how each work, especially on physics behaviours in the folling scenarious:
Physics Example 1
Physics Example 2
Physics Example 3

I’m fully aware of the Official Unity Tutorials; However the Joint2D are not covered. It would be real cool to have clear exampls and scenarios of how to use the four Joint2D:

  1. Spring Joing 2D
  2. Distance Joint 2D
  3. Hinge Joint 2D
  4. Slider Joint 2D

Google: Unity3d youtube yourDesiredJoint, there were several YouTube posts for each.