How are videos in 23.97 frames per second shown
24fps videos on a 30fps display (closer to 23.976fps on 29.97fps) divides out into 4/5. Conversion of film frame rate to display/TV frame rate is known as Telecine. NTSC video uses 2:3 Pulldown as the method for displaying 24fps on a 30fps device. 2 of the 5 frames in each pulldown cycle are interlaced.

You can do the same math with 23.976fps/24fps on a 59.94fps/60fps display: 23.976/59.94 = 2/5. While I don't know the exact pulldown method for this frame rate, the concept is essentially the same.

While each individual frame is available as a still, your mac handles the pulldown and frame interlacing on the fly.

(This is why 120fps and 144fps displays are great - 24fps divides into 120fps and 144fps evenly, so the video shows each video frame for 5 and 6 display frames, respectively. No interlacing artifacts.)