How did the moon get it's motion?

Newton and Kepler's law.

Smashed the earth, possibly the Pacific basin, and form a moon; that was one of the theories.

Conservation of momentum and angular momentum, keep the moon in motion.

Well, the Big Whack explains why it formed, but gravity and mass explain the motion. Just like the ISS or space shuttles, the moon is the right mass at the right distance so the Earth pulls it down at just the right speed so it essentially ends up in infinite freefall. Orbits are just an object moving fast enough to counteract the gravity of another, but not escape, sort of locking it in a pattern of falling down and flying away. This appears as a roughly circular or elliptical orbit.

When the Earth was whacked by the Mars-sized object, a lot of mass of the two bodies were ejected into space, in orbit about the Earth. The motion of the debris was caused by the impact, but since both bodies were moving more or less in similar orbits about the sun, most if not all the debris flung into space remained close to and in orbit about the "new" Earth.

That debris collected due to gravity - eventually forming two moons, which collided about 1 to 5 million years after the original impact, forming the singular moon we have today. Basically, it was a collection of objects already in orbit...

Gravity and mass. The gravity of earth pulls it towards it and its mass and tilt make it move around the earth. Think of a spread out sheet. Then thats the fabric of space. Then you put basketball on the sheet and it bends inward. Thats what planets do to fabric and its mass and tilt have it rolling around the basketball on an incline. Think of those coin things where they roll around in the funnel. The hole is the earth and the rolling coin is the moon

The Moon actuallly is just a huge ball of Earth that flew off of the Earth when an astroid encountered it. hey, with that in mind, since its life on Earth, shouldnt there be life on the Moon?..... maybe that's why nasa is continuingly spending so much money and time going back and forth huh? hmmm.......