Question #227868 on Yade changed:
https://answers.launchpad.net/yade/+question/227868
Status: Open => Answered
Bruno Chareyre proposed the following answer:
Could you elaborate your question? What/why is wrong?
If omega_c was the spin of the contact, then the relative spin of each
sphere would be (omega_1-omega_c) and (omega_2-omega_c)
Then the relative spin 2 wrt. 1:
(omega_2-omega_c) - (omega_1-omega_c)
Which gives obviously (omega_1-omega_2)
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