Does the pseudo force only exists when there is contact
Answers
There is no reason why you cannot use an inertial frame such as the ground. You only apply pseudo forces when using a non-inertial frame.
If you do use a non-inertial frame of reference, then you have to treat pseudo-forces the same as real forces - ie you have to consider their tendency to rotate an object as well as their tendency to cause liner motion in this frame.
In an inertial frame the pseudo force does not exist, therefore it causes no torque in this frame of reference.
The torque on the rod is the same whichever axis you measure it from. Torque is provided by a couple which is two equal and opposite forces separated by a non-zero distance. Distance from any axis does not come into the definition, only the distance between the forces.
Answer:
No.
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