i can't accept your answer of 0.8 because.
1. no work is shown
2. no units.
i think instead of justifying OPworld gravity, you should discuss WHERE ODA'S PHYSICS WENT WRONG, and WHERE IT WENT RIGHT. that would be a better discussion topic.
that said, dear lord.
i'm a physics graduate student, and even i know never to involve real life physics into comics >_>;
but you started this, so hey, don't blame me.
i once made a presentation about physics in one piece to my fellow physics majors in a class, and everyone agrees never to involve real life physics in comics. bottomline is, it's better to be happy than right any day. think about it: if all space exploration movies were physically correct, it would be like 2001: a space odyssey; when you see a space ship out in the space, you will not hear a damn thing. so there goes the whole fun of the KSHOO KSSHOO KACHOOO BOOM of the space battles in starwars and startrek.
as for gravity in OPworld being lower than that of the earth, i wonder why you would go so far as to concluding this, instead of the fact that maybe people in one piece just has stronger leg muscles, or even the fact that ODA GOT QUITE A LOT OF HIS PHYSICS WRONG? look at sanji in arabasta: he kicked through walls. while you can blame that on the weak structure of the wall, or somehow relate that to the this question about gravity, it's easier and probably more correct to conclude that sanji has a stronger leg muscle.
1. Pretty much any jumping. Most notably Nami when she jumps from Cocoyashi Dock to the Going Merry.
(ch 95, p 14)
this was highly regarded as one of the greatest violation of laws of physics. still though, it's probably more correct to say that nami has strong leg muscles that allows her to jump that high and that far… muscles stronger than michael jordan because such a jump would not be possible to do unless you have a springboard underneath. (yes, it was jordan's strong leg muscles that allows him to 'airwalk' because it lets him push the ground with a bigger force and obtain a larger upward acceleration that allows him to "hang" in the air. remember F=ma). keep in mind, however, that oda is a MANGAKA. not a PHYSICIST.
2. Sanji's Kicks that cause Horizontal (Not vertical) force, such as Mouton Shoot. Even with such a great force, they would come to the ground much sooner. Same with Kuroobi's punches.
depends on how hard you push. think of it as throwing a baseball. the harder you throw, the longer the ball will go horizontal before it curves down and touch the ground due to gravity pull. again, it is probably more correct to assume that sanji's legs are just super strong that he's able to exert a huge amount of force into whatever he kicks, and give it a huge acceleration such that the object will reach a very high velocity that allows it to travel horizontal longer.
i can make the calculations for that, if you'd like me to. such as how strong his leg muscles should be.
so in short, this would be a nice, serious discussion if instead of justifying that the OPworld gravity is lower than that of earth, we discuss WHERE ODA'S PHYSICS WENT AWRY.
for example: in skypiea when gadus fights chopper.
now kids, turn onto v28, chapter 262, page 12.
chopper jumped up using jump point, and gadus propelled himself up. then chopper switched to weight point, decreasing his upward velocity and causing him to fall faster.
impossible.
remember that potential energy (mgh) is converted into kinetic energy (1/2 mv^2). so mgh = 1/2 mv^2, and the mass is cancelled out. the upward velocity is INDEPENDENT of mass. remember that v = v0 + at and the other two motion formulas do not have a mass term in it. the only way chopper can decrease his upward velocity and fall to avoid gedatsu's punch is by momentum transfer, which means he'll need to throw something or shoot a shotgun upward, and the recoil will cause him to decrease his velocity.
so chopper's not very smart in physics.
now let's see WHERE ODA ACTUALLY GOT HIS PHYSICS CORRECT: foxy's noro noro beam DOES NOT violate any laws of physics. now please turn to volume 33, chapter 309, page 5.
foxy said that (null translation) anything that gets hit by his noronoro beam will preserve any form of energy it has, but will lose its speed. we all know that energy is conserved (except in some quantum mechanical system and possibly string theory, but let's not get there), so the kinetic or whatever energy the object has before it gets hit by noronoro beam should remain the same, before and after it gets beamed. how can it lose its speed then? well, if the speed decreases, then the kinetic energy should too, since KE = 1/2 mv^2. that means this energy transforms into another type of energy, most likely potential. now notice the effect after 30seconds. all the energy that gets stored up as potential energy from the loss of speed comes back all at once, and this allows what foxy calls "FOXY RUSH." no physics is violated.
my most favorite part where oda got his physics right has to be in v11, chapter 102, page 6, where luffy shot a cannon onto laboon to decrease stop the ship from crashing onto laboon. and it's definitely a great physics moment, because the one person in the crew who actually understands momentum transfer is… LUFFY. xD
too bad he's an idiot. if he were a bit smarter he'd have fired twice.
