From which frame of reference must fictitious forces, like centrifugal force, be introduced to make Newton's laws mathematically consistent?

Answer

The non-inertial (rotating) frame

When observing motion from the non-inertial frame (spinning along with the object), centrifugal force is introduced as a fictitious force to mathematically balance the real forces acting on the object.

From which frame of reference must fictitious forces, like centrifugal force, be introduced to make Newton's laws mathematically consistent?

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