General question regarding "Momentum" Hi! Is it possible to have negative momentum? I would think that as long as it's before a collision, this is not possible because an object would be moving forward, therefore having a positive velocity. After a collision (given that it is inelastic), however, the object most likely will move in the opposite direction, in which case the velocity is considered to be negative, which in turn makes the momentum negative. Does this sound logical, or am I completely missing the point?