First of all, I'm not a science guy so please explain in a way which is not too hard to understand.
I was watching some pacific rim videos and I wondered why the giant robot seemed to move slowly...
Is there some "science" which says this should happen?
I mean, in movies like "Antz", when they see the humans walk, it seems to move in slow motion too... and I remember how some discovery channel videos showed how flies were able to flee from getting slapped by humans because they perceived it in slow motion too.
Also, there was this teacher I had, who criticized the old TV series "Land of the Giants" because he said that the bone structure of the giants would need to be really hard (he used other words, but I was bad at physics so I can't exactly remember), and how it'd be impossible for that to happen. This may be some other question but.. wouldn't it be possible for the giants to have "giant cells" too, so their molecules would also be big and they would be governed by other gravity principles or something like that?

>>1532290 (OP)

Depends on the provided power. There is no law of nature that would make a skyscraper high robot do acrobatics like an olympian - but he has to be able to provide the power to move those massive masses at those speeds. And the base units stay the same. Imagine the robot in your pic doing a leisurely walk. TO him that would be like 2-3km/h is to us - but in reality he'd have accelerate his massive body to several 100 m/s. Kinetic energy is 1/2*mass*velocity^2 (!). So double speed means quadruple required energy. There is also the square law for lifeforms using bones as structure elements (mass rougly cubes with increased scale while the bones only sqare, this leads to Godzilla in real life collapsing under his own weight), but a robot may use different ways to stabilize itself, so while still being affected by it it is not restricted to bones - but even when imagining it using some kind of shell like a insect at some point the material will collapse under the pressure, so you need fictional super-material for the robot in your pic - it is made out of unobtanium.
So while there is no law that restricts its movement PER SE, it would have to provide MORE AND MORE power for even the slightest movement with increasing size.

>>1532296
>this leads to Godzilla in real life collapsing under his own weight
more on this?
I mean, why isn't a giant life form supposed to survive?

>>1532299
oh, found this after searching the square law
https://tvtropes.org/pmwiki/pmwiki.php/Main/SquareCubeLaw
thank you for the leading.
I still wonder if smaller creatures actually perceive us as going in slow motion...

>>1532301

The square cube law technically only refers to the surface, but it is often also applied to the bones, which are idealized a as linear as they mostly are there to take vertical linear loads, so very roughly they'd for example double while everything else quadruples. Which is of course very simplifying (they scale in 3 dimensions as well after all), but that is shorthand for all the other problems that would arise to keep those bones functioning at those sizes. But it would for example also mean that Godzilla would at some point overheat.

If other small creatures percieve us as moving in slow motion mostly depends on their senses and less on physics. An insect seeing as fast as humans would see us ZIPPING by, but insects have different eyes from us, also far shorter nerve signal lenghts. If I remeber correctly experiments determined a fly sees movements roughly 10 times as fast as humans, so to it everything happens at 1/10 of the speed - but that has less to do with the sizes. It would for example also see your 60Hz monitor building its picture.
The depiction in movies like Antz is more for the cinematic effect - there are inconsistencies on how the ants in that move percieve the world in terms of speed, in some scenes it seems to be human like, but in some others time seems to go slower.