Do couples always produce rotation?

[Andy21]

Homework Statement

Do couples always produce rotation and does the torque of a couple always equal of resultant torque?

Homework Equations

The Attempt at a Solution

I think the answer for both of them is yes.

 

[alex3]

Provided there are no frictional forces, then a couple will always result in rotational motion.

Resultant torque sounds like it would be the sum torque of the system you're looking at. If you have a system with more forces acting on it than just one couple, then the resultant torque will have components other than that due to the couple, so the couple moment (torque) will not be equal to the resultant torque.

 

[Andy21]

So if there are no other forces acting, only the couple, will the torque of the couple equal the resultant torque?