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Playing a record? I'll show you something interesting. Compare a point on the label with a point on the record's outer edge. They both make a complete circule in the same amount of time, right? Yeah... but the point on the record's edge has to make a bigger circule in the same time, so it goes faster. See, two points on one disk move at two speeds, even though they both make the same revolutions per minute!
Dad sees Calvin playing a record, so he decides to tell Calvin something interesting. He shows the point on the label and a point on the outer edge of the record. They make a circle at the same time. Dad says the point on the outside of the record has to travel faster because it makes a bigger circle. Two points on the same disk, moving at different speeds, even though they make the same revolutions per minute. Calvin lies awake in his bed at night, eyes wide open, trying to understand it.