The law of universal gravitation describes the force of attraction between objects with mass. It doesn't directly address the concept of momentum.

Here's why:

* Momentum: Momentum is a measure of an object's mass and its velocity (how fast it's moving). It is a vector quantity, meaning it has both magnitude and direction.

* Conservation of Momentum: The principle of conservation of momentum states that the total momentum of a closed system (no external forces acting) remains constant. This means in interactions between objects, the momentum lost by one object is gained by the other, keeping the total momentum the same.

* Universal Gravitation: The law of universal gravitation describes the force of attraction between objects with mass. It doesn't explicitly discuss momentum, but it plays a role in understanding how momentum changes in interactions between objects due to gravity.

In summary: While the law of universal gravitation and conservation of momentum are related concepts in physics, they are distinct principles.