1. The problem statement, all variables and given/known data Why, for any system that is in rotational equilibrium, the torque about 1) any point on the object or 2) any point in space, must be zero. 2. Relevant equations N/A 3. The attempt at a solution What I do not understand is, why the torque about ANY point on the object is zero? Isn't it only about the point of rotation/center of gravity? Say, if I have a seesaw that is balanced (therefore it's in rotational equilibrium?) on both side. If I move the pivot point away from the middle, the equilibrium will not exist anymore, right? How can this be for torque about ANY point? Also, as 2) stated in the original question, about ANY POINT IN SPACE, too? I.e. A balanced seesaw with torque about a random position on the moon?? There gotta be something important here I missed or didn't understand. Can someone clarify these for me? Thank you!