We have no meanings for "zero torque" in our records yet.
If you want a paddle board to go straight, you need to have zero torque.
The distance from the pivot point to the pivot point is zero (thus zero torque).
When wind speed exceeds a certain point, you must lock the rotation with a brake or rotate the blades so they produce zero torque.
Oh, since I am calculating the torque about the center of mass of the guy, his weight will produce zero torque (r is zero meters).
The frictional force and the normal force have zero torques since they pass through point O.
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