Final answer:
Momentum is directly proportional to both mass and velocity, meaning that as either increases, momentum increases. It is a vector quantity and is measured in kg·m/s.
Step-by-step explanation:
The example of momentum p being the product of mass m and velocity v of an object; that is, p=mv, is an example of a directly proportional relationship. Momentum is a vector quantity with both magnitude and direction and it is always in the same direction as the velocity of an object.
The more mass an object has or the faster it moves, the greater its momentum will be. Furthermore, the SI unit for momentum is kilogram-meter per second (kg·m/s).