Because sound from vinyl is analogue it depends on the physical distance the stylus moves in the vinyl, to the volume of sound produced, hence on average, the less distance moved to lower to volume produced. The stylus moves from side to side in the track, bass being produced by a larger movement, treble by less movement but more often (higher frequency).
Records with a predominately large bass element need to have wider tracks to produce the sound and so the 12” was utilised for ‘disco’ sounds and a 10”, at least, acetate needed to cut a decent sounding dub plate. Dig out your 1970’s Buddha 7’s out and you find some 6 minute tracks, but they sound very tiny in comparison to their 12” versions. Try checking a LP of classical music, little bass, and they can go on for about 8 days a side!
Northern-wise the pressings of Gwen Owens ‘Wanted’; the one that jumps are the high volume pressing, as one groove encroaches on the next one, and skips, the ones that plays OK have a much lower volume.