It’s more about horizontal (and to some degree vertical) motion. With interlacing you get the “effect” of recording at 60 frames per second, however only the first 1/60th of the second is recorded into a field (half the vertical resolution) and the second field is recorded to the second field, making up the frame.
With 30p interlaced recording, the recorder stops the motion and records the entire frame made up of the two fields. But the horizontal motion might have a more juddery look.
24p has even more pronounced judder since it only grabs frames at 24 frames per second.
Old CRTs operated at the 60 hertz rate so writing fields gave the smoothest image. (sports etc) Now with flat panels I think a progressive video looks better so we normally record 29.97 30p interlaced and interpret as frames (non interlaced) even though the video playback is actually interlaced (running at 60i)
True 60p (think Sony CineAlta and HDCAM) can record at a true 60 FRAMES per second. No small feat!
Helpful?
Rich Rubasch
Tilt Media Inc.
Video Production, Post, Studio Sound Stage
Founder/President/Editor/Designer/Animator
https://www.tiltmedia.com