Final answer:
From the bicyclist's reference frame, a person standing on a sidewalk appears to be moving in the opposite direction of the bicycle's movement, which would be to the left for a bicyclist passing to your right.
Step-by-step explanation:
If you are standing on a sidewalk and observing a bicyclist passing by toward your right, the scenario must be analyzed from the bicyclist's frame of reference to answer your question accurately. In physics, the concept of relative motion comes into play when determining the perceived motion of an object from another object's reference frame.
In this case, from the bicyclist's reference frame, the sidewalk, and thus you standing on it, would appear to be moving to the left.
This is because, as the bicyclist moves forward, any stationary objects would seem to move in the opposite direction to the motion of the bicyclist. The principle behind this is similar to what we experience when sitting in a moving train and observing the world outside seeming to move in the opposite direction of the train's movement.