[Verse 1] You’re on the platform, I’m beside the window, My backpack hasn’t shifted from its place. The train rolls east at steady velocity; You watch the distance grow between our faces. Compared with my seat, I’m staying still. Compared with the ground, I’m moving east. One passenger, two descriptions— Name the frame and both can agree. [Chorus] Same ride, different frame, The motion changes with the name Of what we measure it against. Say the comparison; it makes sense. Still beside the seat I’m in, Moving past the place you stand. Same ride, different frame— Tell me what you’re measuring against. [Verse 2] From the train, the platform travels west; From the ground, the train is heading east. We haven’t changed the trip we’re taking, Just what we compare to what we see. “It’s moving” leaves a question open. “It’s still” needs something more to say. A reference frame completes the picture; Don’t leave that part outside the page. [Bridge] Moving compared to what? Resting compared to where? Before we disagree, Put the reference frame in there. [Final Chorus] Same ride, different frame, The motion changes with the name Of what we measure it against. Say the comparison; it makes sense. Still beside the seat I’m in, Moving past the place you stand. Same ride, different frame— Tell me what you’re measuring against.
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