Final answer:
Change in momentum, symbolized by Δp, is the difference between the final and initial momentum and is usually measured in kg·m/s. Newton's second law connects net external force to the rate of change in momentum over a specific time interval. Impulse equates to the change in momentum, which is the net force multiplied by the time it acts.
Step-by-step explanation:
The change in momentum of an object is defined as the difference between its final and initial momentum. This is often represented by the symbol Δp, where Δ denotes change. The usual unit for expressing momentum in the SI system is kilogram meters per second (kg·m/s).
Based on Newton's second law of motion, the net external force (Fnet) acting on an object is equal to the rate of change in momentum (Δp) over a time interval (Δt), which can be written as Fnet = Δp / Δt. Additionally, the amount of this change in momentum is also referred to as impulse, and it is equal to the net force applied to an object multiplied by the time interval during which the force is applied.