Place Your Bet: How far will a dumbbell squirt soap?

Рет қаралды 37,093

Күн бұрын

This is the first episode of a series I'm calling Engineered Bets, which tests theory vs. reality and it's your job to determine what will actually happen relative to the calculated line. I'm going to experiment with more and less complex topics to see what people enjoy the most, so I'd love your feedback about the topics, pacing or anything else. Thanks for watching!
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Пікірлер: 182

@JaDroppingScience 17 күн бұрын

New episode of 2 Truths & Trash should be out on the 1st! Any feedback about this new series would be greatly appreciated. Thanks for watching!

@Womcataclysm 17 күн бұрын

It was fun but most people won't want to see all the calculations, you should add chapters in the video so people can skip to different parts, and also, maybe add a quick recap/TL:DW of the math before you get to the reveal, maybe even just a "pause here" so people can read at their own pace, not sure. Still, felt a bit long for just one bet, but I did watch it and I liked it

@Tickingclock4 17 күн бұрын

I think this was better

@flilium2086 17 күн бұрын

This Engineered bets- series would be so awesome.

@transrightsbaybee 16 күн бұрын

this was so fun !! i loved how whimsical the scenario is [:

@megauberduber 14 күн бұрын

As a mechanical engineer this fucks, please make more

@ZevVeli 17 күн бұрын

I said under. I think that the reason it went over is that when the dumbbell hit the dispenser and broke it, it angled the trajectory upwards thereby increasing the amount of time the soap was in the air.

@AsmeowdeuZz 17 күн бұрын

I would say the soap droed nearly indicate they have less initial momentum energy, and some of these energy convert to the furthest part of the soap

@iarmycombo5659 16 күн бұрын

I said under because some would certainly hit below, but i said if only looking for furthest its for sure over. I assume now in hindsight that the over bit is because the soap doesnt act as 1 block of matter as the math assumes, it clings to the walls, thus creating turbulance, basically creating a smaller divider for the tube and launching a small amount of soap that travels in the smaller "tube" further because of it technically having more pressure because same force less volume as the volume is eaten up by the soap that is stuck to the walls by the friction. Also it could be affected by the fact that its probably a designed 90 degree angle in the piping but the soap stuck to the walls of the pipe smooth out the corners and create a f(x)=ln(x) shape for the unstuck moving soap in the tube/pipe, that could allow the soap to still have a small but existing vertical component that allows for more airtime.

@1islam1 16 күн бұрын

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@beetcat6137 16 күн бұрын

@@1islam1 yes im sure that contributed to the soap going further

@nope.0. 16 күн бұрын

I guessed under, with the dispenser being knocked over forwards, decreasing air time.

@tulaibhussain5013 17 күн бұрын

From the beginning I was convinced the dumbbell would shatter the jar and no soap would exit at all. I thought this whole video was a build up to point out no matter how theoretical you think, reality will always differ from calculations. When you said "Think how reality vary will this simple model. Now lets see what actually happened" I was so convinced I didn't even guess.

@JaDroppingScience 17 күн бұрын

Haha yeah I thought about how that could happen. If it did (or does for future episodes), 0 feet would still be considered under.

@anj000 17 күн бұрын

@@JaDroppingScience you need to make a short out of it, but stage it so that the soap dispenser shatters. It will be hilarious!

@calabrais 15 күн бұрын

Reminds me of a software engineering joke. A quality tester enters a bar and orders a beer, 100 beers, 0 beers, -1 beers and everything is fine. A customer enters the bar and asks to use the bathroom and the bar explodes.

@TYsdrawkcaB 15 күн бұрын

@@calabrais IT TOOK A SECOND BUT THAT’S SO FUCKING GOOD HOLY SHIT

@Cp12321 15 күн бұрын

@TYsdrawkcaB can you please explain it

@wareqo9768 17 күн бұрын

man where was this kind of video when i was taking physics, it makes it so much easier to understand than form a book

@blairhoughton7918 16 күн бұрын

I remember the chain reaction demo film where they threw a ping pong ball into a room full of ping pong balls on mousetraps. And that was old when we got it. So this kind of science education has always been around.

@wareqo9768 16 күн бұрын

@@blairhoughton7918 well it's more about how engaging the content is than the content not being around. It's not like I was taking physics ages ago, it was more about not finding engaging explanations.

@FatBoiFishy10 17 күн бұрын

very important information

@user-gq7gi5hv4u 17 күн бұрын

@visillac 17 күн бұрын

Pretty wild how it landed right on the 7.9 mark. My guess is it went a bit forward after splattering then coming to a full stop

@enderyu 17 күн бұрын

My guess for the reason it could have overshot: The calculation (1:50) of the velocity on the nozzle is the minimum velocity necessary so the fluid does not get compressed. However, since the fluid was in rest and suddenly forced to move it creates a slight over-pressure that makes the initial burst of soap have a slightly higher velocity than expected

@lukedieleman6676 17 күн бұрын

My initial 1 second reaction was over, but after watching the calculations I changed my mind to under. My guess as to why the soap went a bit further than the line is likely due to the assumption that the flow of soap will fill the entire area of the nozzle. I would be willing to bet that some portion of the nozzle choked a small portion of the flow more than the exit itself did, which would accelerate it more, also the nozzle was slightly angled upwards, which could have allowed some part of the flow to exit at a slightly higher angle. I'm also fairly sure these calculations are ignoring the effects of viscosity as well as boundary friction, which would help to explain why the bulk of the soap only went 3 or 4 feet.

@sams.8188 17 күн бұрын

this went way over my head but was still fun. good series

@nikhiljayansingla5323 17 күн бұрын

This is literally Ja "Dropping" Science.... 😂😂

@sammiecakie8973 14 күн бұрын

Ok but why on earth are we using feet??? Like that must be a crime against science to not use SI units

@Jack22024 5 күн бұрын

Feet are freedom units

@jwalster9412 3 күн бұрын

American Freedom is a sham. @@Jack22024

@ezriha 2 күн бұрын

Size of 1.5 washing machines.

@IOSARBX 17 күн бұрын

JaDropping Science, This is amazing! I subscribed right away!

@OfficalMcM 16 күн бұрын

Please make a series out of this, this is very fun to watch

@Snowflame47 10 күн бұрын

this video is actually super sick. I just finished my junior year as mechanical engineering student and this video reminded me how much I’ve actually learned and how I can apply that knowledge. good stuff, dude.

@mxm650 16 күн бұрын

My initial thought when I saw the setup was, "It might be a good idea to prop up the soap dispenser so it doesn't get knocked over." I loved this! It brought back fond memories of engineering school. Do more, please!

@matt22953 17 күн бұрын

Thank you for this. Hope are making videos like this.

@jamesmarker3956 16 күн бұрын

If you look at the end of the trail of the soap, it’s behind the 7.9ft estimate. My guess for why it went over is that when it hit the ground, because our x component of velocity was so large, the inertia of the soap allowed a gloop of it to keep moving a couple of inches.

@TheBluePhoenix008 11 күн бұрын

This is amazing!

@rqlk 15 күн бұрын

Now you just need a perfect vacuum and a perfectly efficient and indestructible soap dispenser.

@2thecartoonsimp1 12 күн бұрын

"I mean, what is air resistence anyways?" -Hamiltonian mechanics

@mythicul 17 күн бұрын

I love gambling

@LocalPlagueDoc 16 күн бұрын

Congratulations! You made physics fun and engaging! PLEASE continue making videos like these, you struck a goldmine with this!

@JaDroppingScience 16 күн бұрын

Thanks so much!

@toron4 17 күн бұрын

I loved the little nod to 3Blue1Brown, very fun.

@MJBsor 15 күн бұрын

My guess for why it went further, is due to the fact that the nozzle is moving down, that the soap slows down the moment it leaves the nozzle and the soap exiting behind it is at a constant velocity, so the soap exiting pushed the soap that exited upwards at a slightly higher angle.

@endunry2 16 күн бұрын

Saw your ig reel, hadnt known you before but starting binge watching your yt content now

@divy1211 16 күн бұрын

I guessed under: as a kid, I've tried to hit the soap dispenser just to see how far it could go and I generally found that when you do that, you get yelled at by your mom. the yelling aside, I always found it hard to make it go far with an impulse, and I actually managed to get it to go further if I just pressed the thing really hard instead of hitting it. So I figured the majority of the soap wouldn't even go half way which was about right. I forgot to account for the little splats though, which made the result over XD I believe the reason the majority of it doesn't go as far is because of viscosity and friction with the walls, and the fact that soap dispensers are generally not water tight, so there'd be energy lost to compression and air

@2thecartoonsimp1 12 күн бұрын

Nostalgia>Physics

@edelledezma9872 16 күн бұрын

excellent phisics demostration, loved the video

@peterking6334 17 күн бұрын

Love your videos

@borntoclimb7116 15 күн бұрын

This is the most interesting soap and drop Video.

@Yezpahr 16 күн бұрын

I thought over, but for the wrong reasons. When you said "and that's how the 7.9 feet mark was set" my mind started racing and the tinier hole after the plug may impede it more than I anticipated. I presumed all those holes in the dispenser were the same size but you showed they weren't. I did expect the dispenser to just break outright and a good result would require it to be primed properly and have no dried up clog of soap in the last hole. (sometimes a small layer can gel up or crystallize even)

@Practicing_HVACR 15 күн бұрын

Great video! Loved the thorough explanation. I’m most suspicious of the angle. 4 degrees seems like it was rounded and I would imagine a small difference can easily change the distance slightly.

@Vaaaaadim 14 күн бұрын

I guessed under, just because friction wasn't accounted for. A qualm I have with this is that the experiment was only conducted once. One of the comments noted the possibility that as the dumbbell hit the dispenser it may have angled the trajectory upwards. If the experiment was repeated it might have played out differently where the trajectory was angled further up or down.

@edwardsmoliak109 15 күн бұрын

This was a good concept.

@MoonGlow22 17 күн бұрын

But we calculated thinking the soap wont spread and cummulate at one place And if we take average distance of the shooten soap, its deffinetly under

@suishregmi9911 14 күн бұрын

I thought it would go over and I think my reasoning is correct, please correct me if I am wrong. The 7.9 value we calculated was the point where the soap hits the ground initially, as we see accounting for air resistance it is appropriately 7.8 or somewhere around that. But the horizontal velocity doesn't suddenly goes to zero it encounters certain friction and travels certain more distance before stopping.

@MarkCupLee 17 күн бұрын

Due to the transient nature of this interaction, it's better to tackle this problem in terms of energy. Since only small amount of the soap will be launched. If all of the energy from the bell is transfered into the soap, it will be launched with a ridiculously high speed. Even taking into account the heavy loss of energy, the unknown amount of soap should be launched quite far still. That's my chain of thought into this problem as a mechanical engineer.

@XanquaTheWatcher 17 күн бұрын

I said under! My guess was that because of how heavy the dumbell was, it would push it down really fast, goving it more distance than expected. Since "expected" was the line, past it made the most amount of sense to me.

@rorydakin8048 17 күн бұрын

I chose over 7.9 feet because thick fluids like soap have a "sheer force" which would essentially reduce the exit diameter much more than just the physical restraints of the nozzle, basically the thick fluid sticks to the wall and moves slower, but the fluid itself does not stick to itself the same way. This causes an overall reduction in exit diameter, and thus an overall higher exit velocity. Note that this will only occur if the sheer force is lower than the input force, pressing the nozzle with 50lbs of sharp and fast force (0.1 seconds) vs the same overall force slowly over 10 seconds will yield completely different results

@blairhoughton7918 16 күн бұрын

I said under, thinking the nozzle would slightly depress before any soap came out, lowering y0 thus shortening xf. The over result is interesting. My best guesses are that the dumbell tilted the nozzle back and up a bit, giving a higher launch angle; or, liquid soap is non-Newtonian and that contributed to a more energetic, springier ejection from the nozzle, and also to the less springy compression inside that broke the device.

@anthonyzeedyk406 11 күн бұрын

It probably has something to do with the change in the cross-sectional area of the pump apertures. Those are difficult to measure and have a large impact on the final velocity of the soap.

@2thecartoonsimp1 12 күн бұрын

I think the video is amazing, but if you will make another video of this style, I recommend to put more accruate date as I've tried to do the trajectory before watching the results and I got 8.7ft rather than 7.9ft due to the data being to approximated. Would appreciate if you did that, and great video.

@jeffguo7371 4 күн бұрын

The center of mass of the dumbbell is higher, so you might have underestimated potential energy if you just take the distance between the bottom of the dumbbell and the top of the dispenser as the height. Also, this is a transient flow question, the continuity equation assumes the soap has constant velocity, which is not the case here.

@gullybonesart4670 3 күн бұрын

I guessed over because I’ve launched soap like that before. I think the speed at which the piston compresses contributes the most, from personal experience.

@user-uo1yn4se8r 17 күн бұрын

I guessed down because the spring decelerates the dispenser when the dumbell hits it I think the main factor that caused the result to be higher than estimated is that the soap continues to move forward and smear on the floor after it hits the floor

@EDoyl 17 күн бұрын

Soap behind pushed on soap ahead, a bit like that demonstration where you stack bouncy balls on top of each other and drop them all. If you recorded in super slow motion you might even see smaller droplets spraying out that went further still.

@Meowy-go8pd 17 күн бұрын

Got it right 😊

@EDoyl 17 күн бұрын

This is really great 👍

@Jack22024 5 күн бұрын

I said over because the initial force of the dumbbell compressed the spring with enough force to make the soap shoot out like a rocket

@devl8565 15 күн бұрын

This is the type of question that helped me get extra credit for my physics classes 😂

@Temporary_yesyes 13 күн бұрын

guessing under as the dumbell moves down the end of the dispenser so if the flow rate is the same as the speed going down it'll only go forwards a maximum of 45º

@octocatpug2327 15 күн бұрын

I thought the viscosity would have had more of a effect, though it seems with that pressure it doesn't quite matter

@Tletna 14 күн бұрын

I said under because I believed the mass and spring force of the soap dispenser would resist the impact of the weight (also no fluid is 100% non-compressible, eg water is said to not compress but it still does some with enough pressure). I did not realize that the container would break and that the fluid would then shoot out harder than expected and I also believe when some of the fluid started to separate from the rest that might explain why most of it was below the 7.9 feet but a little bit broke off to go beyond the 7.9 feet. It would make sense that the part that broke off had less mass and would increase in velocity after breaking away. However, this is just a theory on why it happened. I still did not expect this result and cannot fully explain it.

@atesemireltutar6661 14 күн бұрын

We were assuming that the soap would stay intact when we were calculated the 7.9 feet distance. But as we can see soap broke apart in the air and therefore momentum calculations do not work anymore. The soap could have broken up in such a way where no soap particle gained momentum in the right way and it could have undershoot. I don't believe it is DETERMINED that it would overshoot.

@autodidact7127 16 күн бұрын

This was a lot of fun

@lautaromorales2903 14 күн бұрын

could this be calculed with the kinetic energy of the lanched soap being the same as the potential energy of the dumbell? you only need the mass of soap, the mass of the dumbell and the height

@tf9956 17 күн бұрын

I said over. My guess is that it was angled slightly higher from horizontal at impact. My other guess was maybe a calculation mistake? I graphed equation using the same numbers, and I have time equal to 0.057 seconds, which would lead to ~8.3 feet. It was calculated using my ti-83 calculator.

@moonystar6291 14 күн бұрын

I thought under, on the assumption that the dumbbell probably wouldn't fall perfectly and so therefore wouldn't depress the plunger properly, adding in too much instability for it to reach it's potential.

@Azur638 15 күн бұрын

I was thinking that sice things like friction, momentum, and liquid compression exist, there would be more pressure in the soup directly before launce, resulting in slightly longer shot.

@helper_bot 16 күн бұрын

i just guessed it was under because i didnt really think the momentum would transfer over if the suction transfer function is just as bad as the dispenser in my house

@Draconic404 17 күн бұрын

having hit a soap dispenser really hard before made the choice easy, thgose things are powerful!

@Alex_49_YT 17 күн бұрын

I thought due to energy loss through the spring and some kinetic energy loss off the soap through the valve it would go under, but I think the dispenser was hit so it pointed up when launching the soap. Edit: Watching it back, the dispenser wasn’t pointing up I think, but maybe because it broke something about the pressure in the valve changed?

@Asteroid_Jam 13 күн бұрын

I think it went over as you found the potential energy from the edge of the bottom of the dumbbell not at the center of mass of the dumbbell.

@Stooge2 17 күн бұрын

7.4 feet Dang

@Itsmmkk 16 күн бұрын

But the average drop what behind the initial line, so technically behind is the right answer right?

@devavratkhandekar4020 16 күн бұрын

I think the few drops which landed before the 7.9(theoretical mark) lost kinetic energy and the dropes that when to 8.1 ft gained proportional ke lost by prev drops. The ratio of drops which landed after 7.9 ft to before 7.9 ft should support this theory. Due to conventional energy losses, the drops should actually land before the theoretical maximum of 7.9 ft.

@oh_tassos 17 күн бұрын

Additionally to what others have said, could it be that as the soap bottle broke potential energy from the spring was released and somehow turned into kinetic energy on the soap?

@domi-no1826 12 күн бұрын

I watched the short first and picked over, if i saw this i would’ve gotten it wrong!

@kaphity8506 16 күн бұрын

I predicted under. and if the soap didnt seperate it would be under. The „average“ distance the mass traveled is under. But not everybody in a society of soap is the same, and thats fine with me, it’s called variety (or on this case varience)

@bachira0__ 17 күн бұрын

That was all science i knew

@merukit 15 күн бұрын

I think the assumption at 1:55 is inaccurate, in such a collision it might be that the head of the soap dispenser is accelerated to move downwards faster than the speed of the dumbell, which might contribute to it shooting over the line

@TheTrueSuper 17 күн бұрын

But what if you held a hair dryer upside down pointing at an amgle upwards behind it to give it a speed boost as it leaves the pump?

@BJ-GAMING.NR.1 16 күн бұрын

The calculation you have made is very theoretical, you also have to take into account the air resistance and the viscosity of the soap and then it must be the largest amount you have to count on and not whether there are small drops here and there that get further than the total largest amount. It's just like when a person throws a discus, that's also where the first impact is, it also counts even if it slides further.

@gEtar87 16 күн бұрын

New drinking game- playlist this channel and every time someone gets it wrong, they drink.

@rafa_br34 16 күн бұрын

I also thought it would be under, primarily because the model you used doesn't apply the losses such as friction, no idea why it went over 7.9 tho.

@inplfw 15 күн бұрын

I expected under. I wonder how the properties of the fluid affects this. I have to imagine that on a spectrum from water to honey you'd end up with different distances shot.

@anidynium1106 17 күн бұрын

ill use this in my day to day life like my math teacher told me

@ShawnF6FHellcat 17 күн бұрын

I graduated high school as the top of my class for math and science, and this made me feel invalidated... It's like if you play an instrument, then you see someone quite a bit younger than you play the same instrument far better than you could ever dream to... Why is it that I feel this way???

@afox5050 15 күн бұрын

Would this be trigonometry or physics?

@SupernovaSpence 13 күн бұрын

We also forgot about skips… I’d like to see the video over the whole distance :)

@lucasbrelivet5238 15 күн бұрын

I chose under. I think it actually landed under, but didn't stop immediately after hitting the ground.

@theopoldthegamer4284 16 күн бұрын

I'm expecting the soap dispenser to be destroyed, causing the soap to launch WAY under the expected distance

@josephbevan1036 17 күн бұрын

Over, the dumbbell is gonna angle the nozzle up slightly which is gonna increase the distance.

@TheBeeMaster9721 17 күн бұрын

This much work just to calculate how far soap will go… Very detailed though!

@blaster2586 16 күн бұрын

I was thinking that the reason some soap went further is conservation of momentum. Since it’s not a line, it’s a big projectile breaking into others. Original momentum=final momentum. So if some didn’t go as far, the rest would have to travel further to compensate (this is from a basic understanding I’m no physicist). I said under though so consider my Jaw dropped!

@MooImABunny 14 күн бұрын

It's nice how you went over all the details of the model. absolutely disgusting seeing empirical in mechanics calculations, but nice video

@jacobtaylor8206 16 күн бұрын

i think the change in angel is the biggest contributor

@parthhooda3713 17 күн бұрын

The point when he said: let's assume that dumbbell transfers all momentum I thought in reality it won't so it should be under but for some reason I was wrong.

@HaHAjax 17 күн бұрын

at first i thought we were predicting how far the bottle itself was going to launch, not the soap inside

@ElNerdoLoco 17 күн бұрын

initial guess: 4.5 feet. Edit: well, went further than I thought. I was just thinking about how much resistance that kind of pump feels like it has to sudden impacts and kind of wondered if soap becomes more viscous under pressure.

@AS26005 17 күн бұрын

why didn't you use the metric system?

@JaDroppingScience 17 күн бұрын

I'll do both throughout the series. Metric is always nicer but the tape measure I had was in inches so I just kept it lol

@2OXX 17 күн бұрын

BECAUSE THIS IS FREEDOM LAND YOU COMMIE

@stevelewnau193 16 күн бұрын

I said under. Thought maybe the soap would act as a non-Newtonian fluid at very high force and basically resist the dumbbell. 🤷‍♂️

@aayank7722 12 күн бұрын

What level of Complexity is the physics involved here? It seems to be around high school level, perhaps first year college?

@KingJellyfishII 15 күн бұрын

Doing all these calculations in imperial physically hurt me

@E-dart 16 күн бұрын

i think that it was over because the dumbbell still couldave accelerated after making contact with the pump thing

@jan_Masilijun 6 күн бұрын

please use si units

@conboi124 17 күн бұрын

under it will plug the hole for the soap

@kiahplaysroblox4159 17 күн бұрын

Simply the soap dispenser will just break

@xd-qi6ry 13 күн бұрын

Definitely the height of the pump itself

@mushroomcraft 17 күн бұрын

My only problem is how you use imperial units, and mix metric with imperial (seconds are metric) 😩

@parthhooda3713 17 күн бұрын

2:15 bro really included even that 4° or 0.06981317 radians of angle 💀

@bubbasplants189 14 күн бұрын

conservation of momentum be like