When an object accelerates, what other quantity must change as a result, according to momentum concepts?

In the context of momentum concepts, when an object accelerates, its velocity is the quantity that must change. Momentum is defined as the product of an object's mass and its velocity. Therefore, if an object is accelerating, it means that there is a change in its velocity over time.

Even if the mass of the object remains constant, an acceleration implies that the velocity is increasing or decreasing. This change in velocity directly leads to a change in momentum, as momentum is reliant on both mass and velocity. While other factors like force or energy can be involved in acceleration, the immediate effect of an object's acceleration is that its velocity is changing, which is essential for understanding the dynamics of motion and momentum.