This document discusses Newton's second law of motion and how it relates to momentum and force. It argues that momentum, not force, is the more fundamental concept. Newton's second law, which states that force equals mass times acceleration (F=ma), can instead be expressed as the change in momentum over time. This recognizes that acceleration results from a change in velocity due to momentum transfer between objects in contact. Force is thus a result of the transfer of momentum, rather than the cause of motion or acceleration as was initially thought. Momentum is therefore the more basic concept in describing changes in motion.