Highjumps?

hey guys, sorry about the silly thread, just thought it might be good to talk about different aspecs of highjumps, my first question has to be

does the gravity still effect jumps that are long and thin with a flat top, eg, the start of sandblock,

and does it affect spikes that are 72 units or higher?

or does jumping off the 4 units that u wud edgebug off still make a difference on the grav? and if so then sometimes wot ur jumping off on spikes r simiilar to the 4 units at the edge right? so wudnt this turn it into a highjump if it was, confusing? :p
[ Edited ]

im not sure if i can see ne thing that really answers my question, tones too read:p

lol, i dont meen that, im saying have u eva attempted a longjump but at the end wer u jump off the jump makes no sound, like ur jumping off the 4 units u wud usually edgebug, thats the only way i can explain a silent jump:p wot im saying is if u wer to jump off that bit (silent jump) on a highjump wud it still effect the gravity?