The equation "p = mv" represents the relationship between momentum (p), mass (m), and velocity (v) in physics. Momentum is a measure of how much motion an object has, and it depends on both the mass of the object and how fast it is moving. In this equation, mass is measured in kilograms, and velocity is measured in meters per second. When an object moves, its momentum changes if either its mass or velocity changes. For example, a heavier object like a car moving at a certain speed will have more momentum than a lighter object like a bicycle moving at the same speed. Understanding this relationship helps explain how objects interact during collisions and other physical events.