Behavioral momentum is a theory in quantitative analysis of behavior and is a comparative metaphor based on physical momentum. It describes the general relation between resistance to change (persistence of behavior) and the rate of reinforcement obtained in a given situation.
B.F. Skinner (1938) proposed that all behavior is based on the fundamental unit of behavior termed the discriminated operant. The discriminated operant, also known as the three-term contingency, is broken down into three necessary components: an antecedent discriminative-stimulus context, a response, and a reinforcing or punishing consequence. Responding occurs in the presence of the stimulus because responding previously has resulted in a consequence in its presence.
Read more about Behavioral Momentum: Resistance To Change, Preference and Resistance To Change