5.1 What is Momentum?

Momentum is a concept in physics that helps us understand how objects move and how difficult it is to change their motion. At its core, momentum measures the amount of "motion" an object has and depends on two things: the object’s mass and its velocity. Momentum is a vector, represented with the variable ${p}$, and measured in kilograms - meters per second (kgm/s). The direction of an object's momentum vector is the same as the object’s velocity vector

The equation tells us that the more massive an object is, the harder it is to change its motion. Also the faster an object is moving, the harder it is to change its motion.