The term "law of motion" refers to the fundamental scientific principles that describe the behavior of objects in motion. These laws are a cornerstone of physics and help describe everything from the way planets move in their orbits to the way a ball travels through the air. There are several synonyms for the term "law of motion," including Newton's laws, principle of motion, kinematics, mechanics, and dynamics. Each of these terms is a slightly different way of referring to the same basic principles that govern the way objects move and interact with one another in the physical world.