What explains particle motion?

Answer:
There are many kinds of particles and many kinds of motion, so there is more than one answer to that question. In many cases, particle motion is explained by Newtonian mechanics. In other cases, you would need quantum mechanics or Einstein's theory of relativity, or the Maxwell equations if the particles are photons.
First answer by David6023. Last edit by David6023. Contributor trust: 511 [recommend contributor recommended]. Question popularity: 3 [recommend question].