Return to Support ResourcesNextOverview of Reference FramesWhen describing changes in position, it's important to establish one's point of observation, the "frame of reference".Press play to run the animation. Notice that on the left, the reference point is the thrower on the merry-go-round, while on the right the reference point is the seated observer. Depending on frame of reference, the relative motion of the ball is very different.Return to Support ResourcesNext