[gugagore]

I don't see how radians come into the discussion of torque and energy, both of which are N*m in SI.

That discussion has to do with the failure of SI to notate the directions of vectors. When it's torque, the N and the m are at a right angle. When it's work, they are both in the same direction.

[phkahler]

>> That discussion has to do with the failure of SI to notate the directions of vectors.

Well if radian is a unit then torque become Nm/r and is no longer Nm like energy. Then when multiplied by an angle in radians you get energy. It was *something like that*.