plates keep earth in motion
Well, since the earth is moving, the air moves arounds the earth. So, the rotation of the earth makes air move in constant motion.
The fundamental laws of physics. In particular, Newton's Laws of Motion.
The moon is falling, but since the Earth's gravitational pull is constantly acting on it, the moon keeps falling but it is moving towards the Earth so it move in an egg shaped motion.
Gravity keeps things together here on Earth. It keeps the Earth together in the first place, and it keeps us on Earth. It keeps the Earth in orbit around the Sun, and it keeps the Moon in orbit around Earth.
No, the earth's motion is a periodic motion forming an ellipse.
The pull of earth's gravity causes the motion on the downswing, while momentum keeps it going on the upswing.
The nucleus
The moon is falling, but since the Earth's gravitational pull is constantly acting on it, the moon keeps falling but it is moving towards the Earth so it move in an egg shaped motion.
If something is moving, no force is required for that something to continue moving. That doesn't mean there are no forces acting on Earth; for example, the Sun attracts Earth towards it. But that's not what keeps the Earth moving.
Envy
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yes the motion of earth around the sun is uniform