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Physics of video games


ScienceNostalgia101
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I'm not sure whether this belongs in the physics of movies thread or not, but I figure I should have a spearate thread for video games given the interactive nature of the medium.

 

 

 

In one part of Kaizo Mario 3, Mario is temporarily in projectile motion, until his trajectory crosses paths with a waterfall. At this point, the viscosity of his surroundings is no longer negligible, and therefore, he can push his feet downward against the water to propel himself upward.

 

I assume it's exaggerated, and that one couldn't possible propel oneself to THAT extent in real life. But at the same time, this leaves me wondering whether it's possible to "slightly" propel oneself this way, or not at all because it violates conservation of momentum. I know in horizontal motion, one can swim by pushing the water back and therefore propelling oneself forward; it's a matter of encountering less water resistance when putting your hands in front of you than when pushing the water behind you. Could the same thing work vertically? Does it depend on whether one positions oneself for it before entering the waterfall or after?

Edited by ScienceNostalgia101
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Human could not swim upwards, against the waterfall. The body is too weak for such a task. But some fishes do it at least once in their lives e.g. salmon must return from the sea to the river in which it was born. And they must to swim upstream waterfalls. Search net for keywords salmon and waterfall for videos how they do it.

Edited by Sensei
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  • 10 months later...

Gah, forgot about this thread until now. Thank you for the info on salmon, Sensei.

 

In the meantime, another question now, hopefully I'll remember to check the thread more frequently, and it is also on the topic of fluid dynamics.

 

WARNING: Game portrays graphic violence:

 

https://www.youtube.com/watch?v=JU9e_7QRF5A#t=1m27s

 

In Ninja Gaiden Black, an airship is flying through a cloud during a thunderstorm. There appears to be no gap between the cloud and the windows. Assailants break open an exterior window attempting to attack the protagonist, and none of the mist from the cloud appears to wet the inside surfaces of the airship. I'll put aside whether or not it's at a high enough altitude for explosive decompression, but if, let's say, the motion of the cloud were either parallel or antiparallel to the motion of the airship (ie. no perpendicular components) would air and/or moisture be more likely to enter the airship or leave the airship? Would small enough liquid water droplets be in simple random motion analogous to the air molecules, or moving directly parallel to the outdoor airflow? Would the turbulence of the airflow ensure that some liquid water droplets made it inside if only by simple random chance?

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  • 3 months later...

image.png.90e95ac6eadc24ab04c0951c7e27a204.png

In this level from Super Mario Bros. 3 (the real deal, not a fan game thereof) there is a region of trapped air surrounded above and to the sides by airtight walls, and surrounded from below by water. However, the adjacent airtight compartment is filled to the top. Would it be possible to achieve this sort of thing in real life by siphoning the water out of compartment B and into compartment A, and/or siphoning the air out of compartment A and into compartment B, or would differences in fluid pressure prevent that?

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4 minutes ago, ScienceNostalgia101 said:

image.png.90e95ac6eadc24ab04c0951c7e27a204.png

In this level from Super Mario Bros. 3 (the real deal, not a fan game thereof) there is a region of trapped air surrounded above and to the sides by airtight walls, and surrounded from below by water. However, the adjacent airtight compartment is filled to the top. Would it be possible to achieve this sort of thing in real life by siphoning the water out of compartment B and into compartment A, and/or siphoning the air out of compartment A and into compartment B, or would differences in fluid pressure prevent that?

This is like an inverted glass submerged in water.

If the region started out full of water, you could transfer air in and it would displace water

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Ah... so if someone put a tube of air through that green pipe, and into compartment B, the air would then force the water out of compartment B while still allowing it to remain full in compartment A? Would the air pressure it takes to get air into compartment B then depend on the column height in compartment A, or on the column height in the surroundings outside of both compartments? (Ie. Assuming both compartments were at the bottom of some body of water?)

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48 minutes ago, ScienceNostalgia101 said:

Ah... so if someone put a tube of air through that green pipe, and into compartment B, the air would then force the water out of compartment B while still allowing it to remain full in compartment A? Would the air pressure it takes to get air into compartment B then depend on the column height in compartment A, or on the column height in the surroundings outside of both compartments? (Ie. Assuming both compartments were at the bottom of some body of water?)

I don’t see a green pipe

Yes, the pressure you’d need depends on the height of the water column

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Sorry, force of habit. I'm so used to almost all the pipes in that game being green I forgot to check the colour before posting. I'm referring to the blackish-greyish pipe at the bottom-left corner of the screen, underneath compartment A.

 

In any case, thanks!

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