If only inertia were acting on Earth, then the Earth would continue to move in a straight line with a constant velocity in the absence of any external force acting upon it. This means that the Earth would not revolve around the Sun and would not rotate on its axis. As a result, there would be no day-night cycle, and there would be no seasons. The absence of the Earth's rotation and revolution around the Sun would have significant implications for the climate, weather patterns, and the behavior of living organisms on Earth. The absence of gravity would also have a significant impact on the behavior and movement of objects on Earth's surface and in the atmosphere. In summary, the absence of all other forces except inertia would lead to a dramatically different world than the one we currently inhabit.
