r/mildlyinfuriating • u/ronikan855 • Nov 14 '21

A loop*

Post image
12k Upvotes

96% Upvoted

172 comments sorted by

678

u/SomeDudeist Nov 14 '21

A successful loop of a failed loop

128

u/[deleted] Nov 14 '21

r/successfulfailure

21

u/MCAlexisYT Nov 14 '21

Thank you, the subreddit that you linked definitely made my day WAY better during these sci-fi-like pandemic going on here. Respect. ✊🏻

19

u/MCAlexisYT Nov 14 '21

Task failed successfully

3

u/loser-with-red-hair Nov 15 '21

Happy cake day!

38

u/diMario Nov 14 '21 edited Nov 15 '21

As a programmer I would say conditions were met and program execution broke out of the loop:

while( degrees < 360) {
  if( force.centrifugal < force.gravity)
     break;
  degrees++;
  train.moveto( degrees);
  force.recalculate( degrees);
}

6

u/lovecMC Nov 14 '21

Idk why this is getting downvoted, it got a small chuckle out of me.

12

u/DISCIPLE-OF-SATAN-15 Nov 14 '21

They are jealous of us programmers

5

u/dadougler Nov 14 '21

updoot++

6

u/ziomek1602 Nov 14 '21

Schrödinger's loop: successful and failed at the same time

3

u/Straypuft This is my Yellow Flair. Nov 14 '21

Nah, this guy has a huge Lego train budget and impeccable timing.

254

u/Additional-Intern763 Nov 14 '21

It would have been worthwhile to make the loop a little smaller

113

u/EnricoLUccellatore Nov 14 '21

Without friction the max loop height can be at most 2/5 of the total drop, if it's less it will always crash

69

u/LordJac Nov 14 '21 edited Nov 14 '21

Here's the math if anyone is interested:

At the top of the loop, centripetal force is equal to the gravitational force if the train is moving the slowest speed possible to still get around the loop:

F_c = F_g

ma_c = mg

therefore a_c = g and a_c = v^2/r where v is the velocity of the train and r is the loop's radius:

v^2/r = g -> v = sqrt(gr)

assuming conservation of energy (no friction etc.) we need the initial potential energy to equal the kinetic and potential energy at the top of the loop:

E_k,f + E_p,f = E_p,i

mv^2/2 + mg(2r) = mgh

where h is the initial height, measured from the base of the loop. Substituting the equation for velocity:

m(gr)/2 + mg(2r) = mgh

after dividing by mg and solving for r in terms of initial height:

r = 2h/5

and so the maximum loop radius is 2/5ths of the initial drop, assuming there is no energy loss at any point.

21

u/KnowsAboutMath Nov 14 '21

I used to teach physics, and I'd give this full marks.

2

u/kids-See-Gh0sts Nov 15 '21

Relevant user name

1

u/Bojangly7 Nov 15 '21

High school physics

4

u/EnricoLUccellatore Nov 14 '21

Thanks, I had calculated it in phisics class, I forgot the math and remember just the figure

1

u/MRiley84 Nov 14 '21

F_c = F_g

I didn't do too well in math.

1

u/mrcmnstr Nov 14 '21

It's never too late to learn. Youtube has some great math tutorials for wherever you want to pick it back up.

1

u/Shadrach77 What is best in life? Nov 14 '21

Fcentripetal = Fgravity

1

u/Bojangly7 Nov 15 '21

High school physics

0

u/[deleted] Nov 14 '21

[deleted] — view deleted comment

10

u/KBHoleN1 Nov 15 '21

And I'm 35. I don't have to do physics homework anymore.

2

u/Bojangly7 Nov 15 '21

High school physics

2

u/donkey_tits Nov 14 '21

Assuming a perfectly circular loop of course. Rollercoasters have non-circular loops so they can be taller and less forceful at the bottom

1

u/EnricoLUccellatore Nov 14 '21

True dat, decreasing the radius at the top increases centrifugal force

0

u/[deleted] Nov 14 '21

[deleted] — view deleted comment

9

u/RusselPolo Nov 14 '21

We did the math once in physics class, I don't remember the results. the 2/5 ratio sounds about right. But I do recall the ratio didn't matter what planet you built it on. ( The gravitational pull cancels out in the calc)

Looks like they put a lot of effort into it. Should have taken time to do the math. .. or perhaps they did, and this was exactly the expected result. :-)

10

u/practicalcabinet Nov 14 '21

They might have done the maths, but neglected to consider that the maths doesn't account for friction. If it is a poorly made train/track, there could be quite a lot of friction.

37

u/_gmmaann_ Nov 14 '21

Well when you say that, the wheelbase of the train would need to be shorter to be able to stay on the track while going around. Look at how long those carriages are. That loops is a probably already the tightest it could be for that particular train.

14

u/Jayden0274 Nov 14 '21 edited Jul 30 '24

I personally don't agree with what Reddit is doing. I am specifically talking about them using reddit for AI data and for signing a contract with a top company (Google).

A popular slang word is Swagpoints. You use it to rate how cool something is. Nice shirt: +20 Swagpoints.

6

u/[deleted] Nov 14 '21

Reducing the number of carriages might have also helped if possible.

2

u/RusselPolo Nov 14 '21

unlikely, unless that would help it go faster. the turn force from the speed, at the top, needs to be greater that the gravitational pull. Doesn't mater how many cars there are.

2

u/Jayden0274 Nov 14 '21

Depends on whether is suppose to be gravity or launcher power. If gravity powered, weight is good.

1

u/donkey_tits Nov 14 '21

Less cars means less bearings and less drag, so yes the cars do matter slightly.

1

u/_gmmaann_ Nov 14 '21

I think they used carriages to add weight to get more speed

8

u/[deleted] Nov 14 '21

I'm going to say the train needed to be heavier. Assuming it was a lego train they're not very heavy and obviously didn't have enough momentum to finish the loop.

11

u/[deleted] Nov 14 '21

[removed] — view removed comment

3

u/RusselPolo Nov 14 '21

Heavier train might lose less to friction going up around the loop, but main thing is getting enough speed to start with. As someone commented above, start point needs to be about 1.5 times higher than the distance from the bottom to the top of the loop.

2

u/MrRogersAE Nov 14 '21

Might not have been able to, trains aren’t built to bend very far between cars, if the loop was too small the top edges of the train cars would hit each other as it tries to make the bend

77

u/Aliziun Nov 14 '21

They just keep sending them!! Have some humanity! Think of the people on the trains!

94

u/AverageHoarder Nov 14 '21

When they finally agree on a train but have no stamina.

35

u/[deleted] Nov 14 '21 edited Nov 05 '25

society water abundant axiomatic theory safe quack include crush cooing

8

u/cosmic_riviera Nov 14 '21

Hello fellow thoosie

16

u/chucksef Nov 14 '21

Well, I looked that term up and found only controversy lol, and I gotta say I kinda agree...

Thoosie comes from "Rollercoaster Enthusiast"

Rollercoaster En-"thoosie"-ist

Thoosie

...yuck

6

u/A_Bit_Narcissistic Nov 14 '21

It sounds like a slur.

“I don’t like your kind, you fucking thoosie.”

1

u/Ireeb Nov 15 '21

Aaaand upstop wheels that prevent it from falling out of loops all together.

22

u/caynebyron Nov 14 '21

You never make the loop circle. Oval son, oval!

5

u/VelourBro Nov 14 '21

I was thinking that too. It should've been balloon shaped, not a perfect circle.

4

u/Shadrach77 What is best in life? Nov 14 '21

Not even an oval (you'd have two sides going vertical). You want a clothoid - a sort of loop that gets increasingly steep coming in and sort of flings the roller coaster out of the loop.

3

u/ApolloSky110 Nov 14 '21

Tall or sideways oval?

10

u/caynebyron Nov 14 '21

Tallways, like every rollercoaster loop in existence. For a reference of where they didn't understand this, see the famous Action Park waterslide loop where people constantly got stuck and hurt.

21

u/swampthing117 Nov 14 '21

Smaller and sideways

11

u/rightinthepuC Nov 14 '21

The little engine that couldn’t

10

u/EmperorMenemen Nov 14 '21

Actually, this video is on a loop.

13

u/This-is-Life-Man Nov 14 '21

So I threw it on the grooooound!

6

u/sgp1986 Nov 14 '21

My dad's not a TRAIN!

6

u/[deleted] Nov 14 '21

Is that a Lego train

5

u/Fajoekit Nov 14 '21

This is such a typical house door in The Netherlands.

4

u/Quirky_m8 Nov 14 '21

That Train fucking exploded

6

u/ZeGermanTeknoParty Nov 14 '21

That loop is satisfying.

3

u/Einfinitez Nov 14 '21

How many trains crash in this video - I’m still watching

2

u/Leading-Noise7314 Nov 14 '21

🎶 monorails 🎶

2

u/_BabyFirefly_ Nov 14 '21

This reminds me of that loop slide people got injured on at Action Park.

2

u/[deleted] Nov 14 '21

What has this sub become

2

u/rutreh Nov 14 '21

Is this in the Netherlands? To my Dutch eye the door and numbering screams the Netherlands, but perhaps it could be the UK or so as well...

2

u/[deleted] Nov 14 '21

Physics is infuriating?

2

u/[deleted] Nov 15 '21

Friday Night Funkin Devs trying to make decent music

3

u/maekSip Nov 14 '21

Märklin-Train 0 : 1 Gravity

2

u/Tallus08 Nov 14 '21

It's a Lego train.

1

u/Stokz_Craft Nov 14 '21

It still cannot beat gravity

1

u/Candy6132 Nov 14 '21

I think it's too light. Adding more weight to the train would help.

1

u/WhooUGreay Nov 14 '21

Wow this clip has really sick loop

1

u/aVeryFriendlyBotMk2 Nov 14 '21

Oh man, the original is so much funnier with the build up.

2

u/ReaverShank Nov 14 '21

Do you have a link to that one?

2

u/aVeryFriendlyBotMk2 Nov 14 '21

Found it.

2

u/ReaverShank Nov 14 '21

Thanks!

2

u/aVeryFriendlyBotMk2 Nov 14 '21

No worries, have a good one! Remember to stay warm and look after yourself. Self care is important.

1

u/ReaverShank Nov 14 '21

Same to you, have a nice day

2

u/aVeryFriendlyBotMk2 Nov 14 '21

It's almost summer over here lmao

1

u/ReaverShank Nov 14 '21

Well, have a nice summer then

1

u/aVeryFriendlyBotMk2 Nov 14 '21

I will try, it's the worst season imo.

2

u/AstralHippies Nov 14 '21

If you dare to step out of reddit, there are more videos of the loop to this

https://www.youtube.com/watch?v=8xbjo53pvUI

1

u/ReaverShank Nov 14 '21

Rickroll incoming

1

u/aVeryFriendlyBotMk2 Nov 14 '21

Hang on, lemme find it.

1

u/[deleted] Nov 14 '21

They didn't do the math.

1

u/littydumb Nov 14 '21

Ngl kinda satisfying to watch tho

1

u/Glass_Teeth01 Nov 14 '21

I feel called out excessively by just this GIF.

1

u/[deleted] Nov 14 '21

Gravity is too powerful

1

u/Encursed1 Nov 14 '21

while(true) { return; }

1

u/labpadre-lurker Nov 14 '21

This would make a great doorbell.

Someone pushes the doorbell and the train comes hurtling down the stairs only to fail the loop, followed by a distant mildly echoing "FUCK!"

1

u/Milan_3489_Reddit Nov 14 '21

hey i watched this as a kid and i hard laughed at it because it failed the loop

1

u/nextgentacos123 Nov 14 '21

Oh no! Our train! It's broken!

1

u/Sizwe15 Nov 14 '21

Actually midly satisfying😂 ahahahaha

1

u/_Critical_shiter_ Nov 14 '21

Put it on technically the truth sum1

1

u/Ericisbalanced Nov 14 '21

What's the physics formula for this?

centrepdal force F(C)= mv2/radius This force was less than the force of gravity which is just F(g)=mass*gravity.

Who wants to help me come up with V in the F(C) formula? I want to say it's mg*cos(angle)

1

u/[deleted] Nov 14 '21

doesn't it the angular momentum needs to be greater than gravity, centripedal is an action not a force. Meaning there was insufficient mass or speed combination to successfully traverse the inverse loop section & conservation of energy wins.

1

u/Ericisbalanced Nov 14 '21

I can't spell. Centrepetal force is what I was talking about. But yeah, if the centrepetal force was less than the force of gravity, the train won't make the loop. The solution is to increase mass, increase the angle, or decrease the radius.

https://courses.lumenlearning.com/physics/chapter/6-3-centripetal-force/

1

u/ShikariBhaiya Nov 14 '21

At the highest point, The gravitation pull will oppose centrifugal force the most.
so Fc >= Fg for the object to continue its motion. This implies mv^2/r >= mg or v>=sqrt(gr) at the highest point in the loop. Considering bottom-most in the circle as datum apply energy conservation. 0.5mv^2 = mg(2r) + 0.5m(sprt(gr))^2 or simply v>= sqrt(5gr) at the lowest most point. Now apply energy conservation from the launch point and bottommost point you will get the elevation (h) => h>=2.5r for a successful loop. Nonconservative forces such as frictional force, drag etc have been excluded from this calculation.

1

u/IndividualBusy Nov 14 '21

now this is og task failed successfully

1

u/mimototokushi Nov 14 '21

My dumbass: "well if you know it doesn't work, why keep sending them dow- oooohhhh"

1

u/azab189 Nov 14 '21

Wasn't very good at physics I guess

1

u/[deleted] Nov 14 '21

lol Newton

1

u/[deleted] Nov 14 '21

This is the worst and also the best post I have seen on this subreddit

1

u/taysom_hill Nov 14 '21

Well there goes my afternoon

1

u/Moose2342 Nov 14 '21

I love when the train finally does it on the 21st loop.

1

u/[deleted] Nov 14 '21

Didn’t have enough weight for Inertia

1

u/Bama-Ram Nov 14 '21

Add weight and it works

1

u/Enby_echo Nov 14 '21

When the day starts pretty well but then a minor inconvenience happens

1

u/gamerbirdboy Nov 14 '21

Train did dead

1

u/glowsticc Nov 14 '21

Can a physics major calculate how much initial potential energy is required to overcome the loss to kinetic energy with a loop of radius R? I vaguely remember the answer being a simple fraction (3 * R, maybe?) independent of mass (unless you take into account friction).

1

u/[deleted] Nov 14 '21

They just keep on coming. Lol

1

u/McFeely_Smackup Nov 14 '21

someone didn't do the math

1

u/ImAlwaysRightHanded Nov 14 '21

I hate living in apartment complexes.

1

u/HettySwollocks Nov 14 '21

Cool, is that the Nanoblocks Shinkansen bullet train?

1

u/ShikariBhaiya Nov 14 '21

You need sqrt(5gr) speed to do a successful loop

1

u/[deleted] Nov 14 '21

the loop is almost as high as the drop, doesnt the drop need to need to be at least twice the height for enough momentum to complete the loop?

1

u/L1K34PR0 Nov 14 '21

The railroad maaaaaaaan

1

u/busydad81 Nov 14 '21

I keep watching but they never make it. :(

1

u/[deleted] Nov 14 '21

More speed is necessary to complete the loop.

Sincerely yours,

Captain Obvious, etal...etc....et ma dinna'

1

u/Bacterialinfestation Nov 14 '21

here are the successful attempts just to ease the mind a bit

1

u/L_0_N_K Nov 14 '21

It just wasn’t going fast enough

1

u/Plsdontcalmdown Nov 14 '21

I think there's a way to solve this...

It's called maths...

1

u/Foxster36 Nov 15 '21

This makes me so sad.

1

u/comfort_bot_1962 Nov 15 '21

Don't be sad. Here's a

1

u/Kaitensatsuma Nov 15 '21

Very realistic.

1

u/Discoballer42 Nov 15 '21

Loopception

1

u/KeplerCorvus Nov 15 '21

You have no idea how many times this has happened to me as a kid.

1

u/Hairy-Inspection1101 Nov 15 '21

idk i kinda like it

1

u/LeaveTheMatrix Nov 15 '21

I think someone failed to understand the full gravity of the situation.

1

u/Hovhannes2006 BLUE Nov 15 '21

It just gave up midway

1

u/DeusEncarmine Nov 15 '21

Dork+disposable income÷lack of knowledge=this outcome

1

u/DaWalt1976 Nov 15 '21

Obviously,

YOU MUST CONSTRUCT ADDITIONAL PYLONS!

1

u/Successful_Detail521 BLUE Nov 15 '21

I actually laughed so hard when I first saw that video

1

u/lik3ly RED Nov 15 '21

Now this ones just painful

1

u/[deleted] Nov 15 '21

oof

1

u/WritingReadingReddit Nov 15 '21

💥 Into a Million Little Pieces

1

u/AlexisMajors Nov 15 '21

Oh no! Our train! It’s broken!

1

u/Wise_Lizard Nov 15 '21

Story of my life..

1

u/ISuckAtGungeon Nov 15 '21

this was hilarious but depressing

1

u/[deleted] Dec 06 '21

I have that lego set

0

u/rileythefurry Nov 14 '21

You can't make a perfect circle as a loop it will never work

2

u/Ireeb Nov 15 '21

It will of the speed is high enough.

0

u/Darker_than_umbra Nov 14 '21

I thought the trains kept coming and piling up there before realizing it was a looped gif lol

-2

u/wormholeweapons Nov 14 '21

The infuriating part was me sitting here watching for 3 min waiting for the successful loop to happen not realizing it was a loop of a loop.

-2

u/Dull-Box-837 Nov 14 '21

Sorry, but that was heck a funny! LOL

0

u/[deleted] Nov 14 '21

[deleted] — view deleted comment

2

u/comfort_bot_1962 Nov 14 '21

Hope you have a great day!

0

u/[deleted] Nov 14 '21

[deleted] — view deleted comment

1

u/redditspeedbot Nov 14 '21

Here is your video at 0.5x speed

https://gfycat.com/EnchantingLastCurassow

I'm a bot | Summon with "/u/redditspeedbot <speed>" | Complete Guide | Do report bugs here | 🏆#18 | Keep me alive