Final answer:
From the bicyclist's reference frame, a person standing on the sidewalk would appear to be moving in the opposite direction of the bicyclist's travel, which is to their left if the bicyclist is moving to the right.
Step-by-step explanation:
When assessing motion from different reference frames, an interesting phenomenon occurs: what seems stationary in one frame can be seen moving in another. This is a key concept in physics, specifically in studying relative motion. To answer the student's question, imagine you're standing on the sidewalk facing the road, and a bicyclist is passing by moving to your right.
In the reference frame of the bicyclist, everything that is stationary with respect to the ground would appear to be moving in the opposite direction of the bicyclist's travel. Since the bicyclist is moving to your right, you would seem to be moving to their left from their perspective. It's the same reason why, when you're on a train looking outside, the stationary scenery appears to move backwards.
This inquiry invites exploration into the concept of relative motion, which is a fascinating aspect of classical mechanics and is important for students to understand when studying physics.