My understanding is that this is the formula for determining windchill for stationary objects.

What I'm unsure of is if bike velocity and windspeed can be combined by simple addition to determine windchill "in motion", or if there is an exponential factor to consider as when two cars collide head on.

When two cars collide head on, each traveling at 15mph, the force of their collision is not the sum total of their combined velocities. Is it not the same when riding into a headwind?