When you are driving in a circle at a constant speed you are in an inertial reference frame. The statement is False.
A frame travelling in a circle with a constant speed can never be an inertial frame. A frame of reference that is inertial is one in which Newton's law is valid. That means a body will remain at rest or continue to move uniformly if there is no external force acting on it.
For example, an automobile at stationary or a bus going at constant speed are regarded to be inertial frames of reference. A frame of reference that is accelerating is said to be non-inertial.
The reference frame is inertial if a particle moves in a straight line while no force is applied. Since there are a finite number of known forces, it is theoretically possible to rule out each one and limit the situation to one in which the particle is not subjected to any forces.
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