Physical laws are the immutable principles that govern the behavior of objects and phenomena in the physical world. These laws can also be referred to synonymously as "laws of nature" or "laws of physics". They are the rules that dictate how matter and energy interact and influence each other in the observable universe. Another synonymous term often used is "scientific principles", as physical laws are established through rigorous scientific research and experimentation. These principles provide a framework for understanding the fundamental forces, motions, and interactions that shape the natural world. Recognizing these synonyms expands our vocabulary and helps convey the same concept of the underlying rules that govern the physical universe.