In technical discussions one almost always talks about position and momentum. Momentum is the product of velocity and mass, and in physics the idea of velocity is the speed that something is going in a certain direction. So sometimes one can also talk about the velocity of the thing in question and ignore its mass, and sometimes it is easier to understand things if we talk about the trajectory or path that something follows. That idea also includes the ideas of speed and direction. In the following diagrams we will show the main features of uncertainty in concrete terms, in the world of real things. Later we will use a little math to be able to give a clear idea of how much wiggle room there is between position and momentum.