👉 In physics and mechanics, a "plumming" is an event that occurs when an object or force falls to its base. This means it has lost all its kinetic energy and momentum. In other words, the object has reached its terminal velocity, which is where it will never regain any speed and thus cannot continue falling. Plumming is often used in physics to describe phenomena such as a ball rolling down an incline, or when a car skids along a road at low speeds.