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If an object is moving initially, then no force is needed to keep it moving.

The earth formed out of clouds of material that revolved around the young sun shortly after its birth.
Since the earth was in motion as it formed, and there's nothing to stop it, it continues in motion.

It's true that a force is required to CHANGE the speed or direction of an object's motion. The earth's direction
of motion is constantly changing ... and it winds up traveling a path around the sun that's very nearly circular.
The force that accomplishes that constant 'bending' of the earth's motion is the force of gravitation that draws
the earth and sun toward each other.

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