In the inertial frame of reference, what is the role of the centripetal force?

Answer

It is a real force constantly pulling the object inward toward the center

In the inertial frame, the string or constraint provides the necessary centripetal force, which is a real force pulling the object inward to maintain the circular orbit by changing the direction of its velocity.

In the inertial frame of reference, what is the role of the centripetal force?

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What is Centripetal force? - YouTube

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