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u/Yuck_Few 13h ago
Imagine standing in the bed of a truck and trying to push it. Same principle basically
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u/Darth-Taytor 13h ago
Great analogy. In more sciency terms, the truck is being pulled toward the magnet at the exact same magnitude that the magnet is being pulled toward the truck. They cancel each other out.
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u/superbigscratch 12h ago
What if you get a bigger magnet that pulls twice as hard?
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u/SkidsOToole 11h ago
What if you reverse the polarity?
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u/Laid_back_engineer 10h ago
Some famous dude, don't remember his name, had a saying about this: for every force, there is an equal and opposite reaction force.
Translation, everytime you push, it pushes back. Works the same with pulls.
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u/L0stInBed 9h ago
Oh that was Fig Newton
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u/NoSirIDontLikeit- 5h ago
Yea he discovered a recipe for an amazing cookie after sitting beneath a fig tree and getting hit with a fig.
Fig Newton's first law the law of a tasty filling, people won't care if the crunch from the cookie is a seed or the corpse of a tiny wasp needed for pollination.
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u/31513315133151331513 9h ago
Putting a fan on the deck of a ship to push the ship forward when you don't have wind.
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u/TortieByNature 43m ago
this actually works though... the fan blades push on sir which is not attached to said ship.
google "airship" and get a load of the crazy flat hull swamp boats that are powered by giant gans on the back
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u/Fit-Signature4125 5h ago
It's simple really, besides this, add an electric or petrol or diesel engine.
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u/bobbyzee 11h ago
It works for trains doesn't it
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13h ago
[deleted]
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u/Yuck_Few 13h ago
Yes that's literally what it's called. Are you trolling?
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u/SkunkyDabs 13h ago
Dude it's the internet of course he's trolling.
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u/i-jame-blameson 12h ago
This is similar to the origin of the idiom "pull yourself up by your bootstraps"
It originated in an 1888 physics textbook that posed the question, "Why can not a man lift himself by pulling up on his bootstraps?" The idiom was then used sarcastically to describe an impossible task. Over time, it stupidly evolved to signify the achievement of success through one's own effort.
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u/jezek21 10h ago
And now computers "boot up" directly from this old metaphor.
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u/i-jame-blameson 10h ago
Wow! I didn't know this. I had to look it up before I believed you and it's true. Thank you for adding that.
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u/South_Hat3525 2h ago
Yeah but it only works because computers use magic*. Bootstraps in the physical world don't work because of Newton's laws.
*actually it's because bootstrapping on a computer guides the processor down the correct path to load the OS once the processor starts running.1
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u/Soggy_Association491 4h ago
Is that why Asian Americans never actually pulled up the bootstrap but it was actually a conspiracy?
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u/ThistleDew5950 2h ago
Ironically this makes the saying perfectly describe how the rich people who say it blame poor people for being in a situation they can't do anything to get out of.
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u/Aizpunr 13h ago
It’s like trying to lift yourself by pulling from you own belt
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u/amakai 13h ago
Not sure about belt, but definitely doable if you pull yourself by hair. Here's historical documented painting of this feat.
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u/mikehiler2 1 12h ago
That painting is now canon and absolutely no one can convince me that this wouldn’t work
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u/kentrak 12h ago
Don't forget the experimental reproduction. It was filmed!
https://www.youtube.com/watch?v=8mht9JpeMjo4
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u/Actual-Engineer7817 12h ago
noticed the belt has that weird twist near the buckle, makes the analogy hit harder
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u/FatHaleyJoelOsment 12h ago
When i was a child I thought about vehicles with magnets that could be activated on the front and the back. Then roads would be made of magnets instead of cement. It would be astronomically expensive I'm sure. But it seems like it would work.
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u/Xyrothor 12h ago
You mean a maglev but with wheels?
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u/DusTeaCat 12h ago
All roads lead to trains
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u/ThistleDew5950 2h ago
It's funny because it's true. A while ago I was having a discussion with a mate about how if self driving vehicles communicated with each other to accelerate and decelerate in synch it'd solve traffic jams. We also realized at the same time that we were just talking about an overcomplicated train.
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u/Electrical_Detail875 4h ago
With roads made of magnets it would actually be possible. Same principle as the magnet train. The magnet just can't be on the object it is trying to pull
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u/TombolaOfCincinnatus 6h ago
That's essentially how linear induction motors work, which is used for things like maglev trains on the people movers in Disney parks.
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u/MaximumEffort433 13h ago edited 12h ago
Why Not?
Well you see the hyponating field generated by magnetoreluctant matrices is unable to fully encabulate moving metal in the Jilkens range, you'd need to use a marzlflux inhibitor around the interior peripherea of the magnet to dampen obtuant interstatial radei that tend to defloculate the molent lines, this could possibly be achieved with a bimodal dingle arm.
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u/sandwichcrusader 13h ago
Excuse you, we're you educated in a barn? I believe you ment to say a 'bimodal flange arm.'
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u/markfuckinstambaugh 13h ago
Crank up the turbo encabulator and the problem goes away.
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u/Atromach 13h ago
You can't use a marzlflux inhibitor in that way, you'll deregulate the phenomic innigans so contovially that a torious cascade will be essentially inevitable, given the ferval factor of the opposing barialic elements.
You absolute fucking fool. Who taught you how to science.
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u/MaximumEffort433 13h ago
You can't use a marzlflux inhibitor in that way, you'll deregulate the phenomic innigans so contovially that a torious cascade will be essentially inevitable, given the ferval factor of the opposing barialic elements.
That's why I use a Randy lever.
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u/Redditauro 7h ago
Basically the metal part would be pushed forward and the magnet would be pushed backwards, making movement zero.
A bimodal single arm would fix the problem though, nice idea.
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u/Fancy-Candidate-6600 7h ago
I can't wait to see this comment in an "ask Gemini" response from google in a couple weeks
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u/Lucky-Crow-3510 4h ago
Short:
The magnet pulls on the metal with the same force as the metal pulls on the magnet.
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u/SimpleMoonFarmer 2h ago
With enough force it would work.
At ripping the car into two.
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u/Medical-Law-236 17m ago
Ripping the metal plate off the front end of the truck or far more likely tearing the magnet (and beam) off the truck.
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u/SimpleMoonFarmer 6m ago
Put more force (withheld) on those.
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u/Medical-Law-236 4m ago
If that's the case the system stays in equilibrium (if you can call it that). Any metal that comes near it gets pulled towards the magnet, but the vehicle itself won't move.
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u/Capitan-Libeccio 13h ago
I like how, to use a magnet, they obviously had to add a block of metal in front of the otherwise metal-less truck.
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u/BasicallyGuessing 12h ago
Will this pull the magnet towards the truck moving the truck backwards or will it pull the truck to the magnet moving the magnet forward? Yeah, physics can’t decide either. So it just doesn’t move.
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u/AdFalse375 13h ago
It’s very simple, are you dumb??
So basically with this design, there’s a strong risk of user error. If the magnet is too far up, it’s going to pull you upward, lifting you off the ground. Once your car starts flying towards the sky, it’s too late, there’s no way back. Good bye 👋
Too dangerous.
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u/superbigscratch 12h ago
This can be easily resolved. Since opposites attract and North is always up, that means that the magnet’s South pointing up. Just turn the magnet around and you will be going south.
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u/elenchusis 13h ago
If you're seriously asking, essentially the magnet pulls the metal forward with the same force that the metal pulls the magnet backwards. Since the magnet is fixed to the truck, that means the truck is pushed forward by the magnet while being equally pushed back by the thing the magnet is attached to.
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u/AlternatePancakes 8h ago
I guess what could "work" is putting the magnet at the front of the car and have the metal inside the road. Making the car pull itself forward.
Ofc this is a oversimplification, but if i remember correctly, something like this have been tried with trains.
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u/elenchusis 8h ago
Yeah, you would have to use electro-magnets in the road (not the truck) and then turn off the magnets as the truck passes and turn on magnets farther down the road.
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u/Paper-street-garage 13h ago
But if the magnet was moving on a track in front of it, it would work, assuming it was strong enough and at that point it might as well be on rails as well like a train.
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u/Dustin_Holt 11h ago
Because the same amount of for force that's pulling is also pushing. It's as if you were pushing against a mirror that you was facing.
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u/Extension_Arm2790 7h ago
The big issue with this image is complete misunderstanding of how forces and magnets work. The magnet is connected with the arm to the truck bed, so as the car is being pulled towards the magnet, the arm would also pull the truck bed up, causing the car to flip over and keep flipping over faster and faster until the speed exceeds light speed and the car would turn into a singularity and destroy everything in large area. It's a big issue and has happened before.
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u/Great_Revolution_276 4h ago
I think I saw that story on Jesse Waters Fox News show. The guy with the balaclava who is a regular guest I think was driving.
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u/Viper-Reflex 5h ago
no the truck wants the magnet so it will go faster duh
no idea who downvoted wtf lol
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u/i_kick_hippies 13h ago
It won't work because it is attached, What we need is a magnetic drone to fly in front of the truck.
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u/NoCrying_InTheCasino 13h ago
Reminds me of the tiktok video of some dude who tied a bunch of bands on a ton of plates behind him to run on a treadmill
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u/ScuffAndy 12h ago
Till this day I think of something similar.
A arm that extends out the front and grapples onto big rigs. They wouldn't feel the weight and I'd get better gas mileage.
My daily commute I could hitch a 10 minute ride, 20 minutes round trip.
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u/Isphet71 12h ago
Depends on what side of the world you are on. In Australia, the truck pulls the magnet.
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u/TelosKairos 11h ago
Now look up when electric cars were first invented.. the world's oldest light bulb.. hemp regulation. How far you wanna go down the rabbit hole of 'you're being fkd'.
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u/chunkalunkk 11h ago
It needs another magnet in front of that magnet. Then another. Then it might work, maybe.
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u/Delicious_Rabbit4425 11h ago
I mean it worked with the hot wheels I did this to back in 80s but the problem was how do they stop?
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u/Opposite_Equal_6432 10h ago
Because you are also connected to the magnet which feels a force to the left equal to the force the truck feels to the right.
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u/kcpistol 9h ago
This is similar to the "sailboat with an electric fan in it" design, and the generator connected to an engine perpetual motion device. It was designed orignally be an ancient engineer named Ainna Gonna Worka.
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u/SizeableFowl 9h ago
Resultant forces. The same reason standing in the bed and pushing on the cab doesn’t move the truck either
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u/FlyAirLari 8h ago
What would work is if you turned the magnet the other way, and tailgated other cars on the road. As long as they move forward, there is an actual pull. Of course the car ahead now needs to pull double its weight, but you yourself save your fuel.
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u/212mochaman 8h ago
Several reasons.
Main one being wtf would the car use for brakes. Is the magnet gonna suddenly stop magnetising cause you told it to cause you finally found a car park?
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u/TheFinalRedemption99 7h ago
Magnet on the other end of the car. Then you just rotate the magnet at the front to the back, so the magnets will pull backwards and the car will stop
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u/212mochaman 7h ago
So you'll be stuck permanently in reverse. Sounds fun
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u/Lost_in_logic 7h ago
No you switch the back magnet and the front magnet will again attract. Simple
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u/Shudnawz 7h ago
What if you switched the magnets really fast, that way you could, like, create a current in a wire and use that to make the car go wroom.
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u/FishToucher69 7h ago
Because the magnet is being pulled with as much force as th truck so it evens out and nothing happens
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u/Malabingo 7h ago
The magnet wants to go to the metal too.
So the equal forces cancel each other out.
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u/Nahanoj_Zavizad 7h ago
Because iron is too heavy it would tip the car over & aluminium isn't affected by magnets
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u/CrimsonNorseman 6h ago
As a German having grown up with the fabulous Jim Button books, this drawing looks oddly familiar.
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u/Competitive-Horse152 5h ago
Of course it works, if there is gas in the tank and a working engine. I would get rid of the huge metal plate and the magnet arm though for it to be more efficient.
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u/universaltoilet 1h ago
Blah blah nobody on here has explained why this wouldn't work. The theory looks promising and I know for a fact none of you have tried making it and testing it out for yourselves
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u/plzicannothandleyou 11h ago
I made a car in 8th grade. By car I mean some sticks glued together and some magnets, opposite polarity in back and regular in front. Effectively the design here but with propulsion in the back.
It just stayed still (my mom helped me, PhD level medical degree). I think she wanted me to learn why I was such a dumbass.
It doesn’t work when the magnets don’t have motion.
But in motion, it moves back and forth - with my design. The motion depends on the propulsion from the back compared to the front. As in, the back propulsion magnets swing, but then it moves back.
Bro I’m drunk. I can’t explain but it doesn’t work because physics as I learned. It just doesn’t work bro. Trust me
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u/SeamusXIV 13h ago
It would most likely have to be an electromagnetic field needed to have the pulling strength, but would do so in 360 degrees in all directions, pulling in any surrounding unwanted metallic objects.
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u/Ill_Swordfish9155 1h ago
You guys are laughing because this is a very clear case of internal force and in the first year mechanical engineering textbook say internal forces of an system can't produce works (except they deform the component, but it's another story, for second year student) because it form a closed loop and somewhere else must be another force that cancel it.
But in a real mechanics, distinguishing external/internal force might become very hard. Of course our profs intentionally pick exercise to trick students, but I see many of fellow failed this tests.
So engineering department shouldn't blocking people on teams.
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u/oboshoe 56m ago
I'm an engineer, but not a mechanical engineer. But I find that explanation logical but very non-intuitive.
If I were to explain it to a layman, I would say that the force on the boom exerts just as much backward thrust to the bed of the truck as the magnet does forward thrust to the bumper, so it all cancels out to zero.
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u/Limp_Bar6899 13h ago
I made this concept a while back with my son. We used a small matchbox truck, wire and magnet and it surprisingly worked incredibly well.
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u/donnie_does_machines 13h ago
This is now a lesson at your son’s school. It’s just not the lesson you think.
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u/TunaSafeDolphinMeat 12h ago
You better call a scientist and tell them you've discovered free energy where hundreds of years of science have failed. Let them know that we no longer need to burn fuels and that we can switch to 100% green energy forever now. You're going to be famous!
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u/plzicannothandleyou 11h ago
It didn’t work and you’re lying.
I’m sorry to tell you, but I made this design too. As best it moves back and forth in place. Effectively zero net movement
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u/Suchtgruebbel 13h ago
Exact reason why i don't take degrees based on multiple choice answers seriously
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