Indeterminate Innovation

One of my pet peeves when watching televised sports is when the commentators declare that one or another player or team “has momentum” or that “the momentum has shifted.” Typically, this statement is made shortly after a team or player does something that puts them in a better position to win the game, and the implication seems to be that this change in momentum will carry someone to victory. But there are at least two problems with this all-too-typical sportscaster pronouncement. One is that “momentum” is a mathematically well-defined notion in physics, where it means the mass of an object multiplied by its velocity; linear momentum is also a vector quantity, and has both a magnitude and a direction. It is this complexity that allows momentum and changes in momentum—in conjunction with an account of the various forces at work on the object—to explain the object’s trajectory. A well-kicked football has momentum in the physics sense, but it is quite unclear how the “momentum” of a player or a team might be calculated, to say nothing of the various forces at work on the player or team’s movement through the playing of a game. Hence both the determination of a player or team’s “momentum,” and the use of that “momentum” in explaining or predicting the outcome of a game, necessarily remain at the level of metaphor.