# Does Newton's second law of rotation only work for the center of mass?

## Does Newton's second law of rotation only hold for torques about the com?

looking at this: Rotation and center of mass -- A collection of common doubts, in the second part, GRocks asks

"You have a rod (again, free), and now you continuously apply a constant force of equal magnitude and direction, on both ends. Intuitively, you wouldn't expect the rod to rotate. You say 'at all times, the torque about the COM is zero, so the body will not rotate'. But at any instant, about ANY other point, there is a non-zero torque. Why are we only considering torque about the COM? Why not any other point on the rod?"

"Something very nice happens when one chooses to use the center of mass as the point of interest: the translational and rotation equations of motion decouple. The translational acceleration of the center of mass is a function of net force; torque does not come into the picture. The angular acceleration is a function of net torque about the center of mass; force does not come into the picture. "

Isn't the natural conclusion of that that Newton's second law of rotation only holds for rotations about the center of mass because it is the only point where the equations of motion decouple? Does this happen at other points depending on the case, like for example opening a door?