Final answer:
Momentum is directly proportional to the mass of an object; the higher the mass or velocity, the greater the momentum. In classical physics, it is the product of mass and velocity, and the relation becomes more complex at relativistic speeds.
Step-by-step explanation:
The type of relationship that exists between momentum and mass is that momentum is directly proportional to mass. When applying classical physics, momentum is calculated as the product of an object's mass (m) and its velocity (v). This means the more massive an object, or the faster it moves, the greater its momentum. For example, a large truck moving at a high speed has significantly more momentum than a small car moving at the same speed.
The equation that describes momentum in classical mechanics is p = m × v, where p is momentum, m is mass, and v is velocity. This relationship also indicates that if the velocity of an object changes due to an applied force, the object's momentum will change as well. In cases of special relativity where high velocities near the speed of light are involved, the relationship between mass, velocity, and momentum becomes more complex as massive objects approach the speed limit set by the speed of light.