Physical principles are fundamental concepts that describe how the natural world operates. They include laws such as Newton's laws of motion, which explain how objects move and interact with forces, and the law of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another. These principles are essential for understanding various phenomena, from the simple act of throwing a ball to complex systems like weather patterns or electromagnetic waves. By studying these principles, scientists can predict outcomes and develop technologies that improve our daily lives.