Motion can be described relative to a frame of reference from "summary" of Physics 11 by British Columbia. Schools Department. Curriculum Development Branch
When we observe an object in motion, we must consider our own position in relation to the object. This is because motion is not absolute - it is always relative to a frame of reference. A frame of reference is a set of coordinates that can be used to determine the position of an object in motion. For example, if we are standing on a train platform watching a train go by, our frame of reference is the platform itself. We can describe the motion of the train in relation to the platform - how fast it is moving, in what direction, and so on. However, if we were on the moving train itself, our frame of reference would be different. We would now describe the motion of the train in relation to the inside of the train, rather than the platform outside.
This concept of relative motion is cr...
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