Definition
Momentum is the quantity of motion of a moving body, defined as its mass multiplied by its velocity. It describes how difficult it is to stop a moving object. Think of a bowling ball rolling down the lane 🎳 or a car accelerating on the highway 🚗. The heavier the object and the faster it's moving, the more momentum it has. Momentum is a key concept in physics. It applies to both linear and rotational motion.