I'm a science teacher and from what I can see we have several forces at work here. There is Kinetic Energy which is the energy in a moving body, such as the wind, a speeding train, or a tractor trailer. When you are moving and one of these objects passes you, you can feel the wind or forces of this moving object. This can sometimes cause someone to take a funny step or go off course a hair. As Street Sense (speeding train), blew past Hard Spun (person or animal standing/walking/running near the train tracks) causing him to slightly alter his style. We could also get into inertia, speed and velocity, but it is what it is.
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