Here's why:

* Momentum is a measure of an object's mass in motion. It's calculated by multiplying an object's mass (weight) by its velocity (speed).

* Formula: Momentum (p) = mass (m) * velocity (v)

* Units: Momentum is measured in kilogram meters per second (kg m/s).

Important Note: Momentum is not a force itself. It's a property of a moving object. However, momentum is directly related to force through Newton's second law of motion:

* Force (F) = Change in Momentum (Δp) / Change in Time (Δt)

This means a change in an object's momentum (due to a change in speed or direction) requires a force acting on it.