[Verse 1] Cart rolls right, rider in the seat, Mark the starting place where the wheels first meet. Ground-frame origin: where the rider starts. Cart-frame origin: the seat inside the cart. Right is positive; now we’re keeping track. Every second, write the position on the map. Same rider, same moment, two columns to complete— One compared with ground, one compared with seat. [Chorus] Zero, four, eight— Ground-frame numbers change. Zero, zero, zero— In the cart, they stay the same. Two columns, one ride, Keep the comparison beside Every number that you write: Name the frame and get it right. [Verse 2] At zero seconds, zero in each column. One second: four meters from the ground’s starting position. Two seconds: eight meters to the right. The rider’s moving in the ground frame—right. But compared with the seat, the rider hasn’t shifted; Zero all the way, no change in position. Eight meters right in two seconds elapsed: Four meters per second in the ground-frame map. [Bridge] We didn’t take two trips. We didn’t change the rider. We changed the reference frame— Write that beside the answer. [Final Chorus] Zero, four, eight— Ground-frame numbers change. Zero, zero, zero— In the cart, they stay the same. Two columns, one ride, Keep the comparison beside Every number that you write: Name the frame and get it right.
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