Friction alone holds pencils on the wall... or does it? (2 Truths & Trash)
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- čas přidán 29. 08. 2023
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2 Truths & Trash Playlist (All Episodes): • 2 Truths & Trash
Here's a list of questions that will be answered in this video:
1. Can you stick random objects to walls just by sliding them?
2. Does sunscreen block IR waves?
3. Does water with food dye propagate through paper towels and create new colors in empty bowls?
4. Can you extract iron from cereal?
5. Does magnifying the sun on the black part of a balloon make to easier to pop than on a lighter colored part of the balloon?
6. Does a toilet flush in different directions depending on which hemisphere you are in?
7. Does dropping a heavy object off of a boat cause the water level to rise?
8. Does adding water inside a balloon prevent it from getting popped by a candle flame?
9. Can you instantly freeze ice by chilling purified water in a salt water and ice mixture? - Věda a technologie
For those interested in the follow-up video about dropping Tungsten off a boat, here's the link: czcams.com/video/BXa0w6iiPpg/video.html
Thanks for watching!
@JaDroppingScience the last one about ice and salt is nothing new. It's how homemade ice cream is made. You put in and pour rock salt over it in the churn and with a crank turn the inner one with the cream mixture. Within 30 minutes to an hour you have ice cream. I grew up on that I was either the one stuck turning it an hour or the one sitting on it keeping the inner container from rising up ( needless to say your ass is frozen afterwards lol) .
It’s specifically in a boat you son of a mother T.T
Confused the hell out of me because I ignored the boat detail
Oh, it lowers? I thought it was a technicality of “if the cube is in the boat, and the boat is in the water, both the cube and the boat are in the water. Moving the cube wont displace it, because it was _already displacing it”_
You are right about the cube already displacing the water. The catch is that, when the cube is in the boat, it receives sufficient buoyancy (via the boat) to support all of its weight, and when it is not in the boat, the total buoyancy is lower, hence the cube sinks. Buoyancy is proportional to the amount of water displaced, as per Archimedes, so the amount of total displaced water decreases when the cube is thrown overboard, hence the lowering of water level.
Side conclusion is that if you throw a block of wax overboard instead, when the wax stabilized floating, the water level will be the same as when the wax was on board, as the total buoyancy stayed the same as the total weight of the boat and the wax.
@@lanceraltria OH that makes sense
The volume of the water remains but the surface level changes because of buoyancy
@@lanceraltria that is a brilliant explanation. Couldn't have said it better!
@@lanceraltria That's probably about as concisely as that could be explained without being confusing. Good job
You're not wrong, it's just a question of *how much* it was displacing. If the boat is the overall denser object, then the water level will indeed stay the exact same when you drop things off the boat. However, if you have something significantly denser than the boat in there, then it pushes the boat deeper into the water, due to its density. And the boat therefore displaces more water with the object in it, because the object technically increases the boat's density (or, more precisely: the density of the boat-system). When you drop the dense object over board, the boat normalises and stops displacing the additional water. So the water level lowers. Of course, the object *itself* now displaces some water, but since it is significantly smaller than the boat, it displaces *less* water than the boat-with-object-system did previously. So although the object itself of course also displaces water, the water level rises because its volume displaces less water than its density
as part of the 11% of the world's population who lives in the southern hemisphere, my toilet flush doesn't even spin it just goes from all directions
While this has been debunked for a long time, toilets are different from country to country so I'm wondering if that was taken account of.
We used this method of sticking stuff to the wall with plastic pens to troll our friends in school.
You take a few pens and hold them together so that one pen in the middle sticks out the bottom. Then you hold them tightly together and slam them onto the desk so the one sticking out gets pushed into the other group really fast. The resulting friction causes the plastic to get hot and sticky, so the pens fuse together.
In some cases you actually had to break them to separate them.
I thought the video was fake because pencils usually don't work with this, probably because their paint coat doesn't melt. Maybe yours are different though.
every pencil i tried worked
@@watarodperhaps the wall paint was the variable
Yeah I've ever seen this done with plain wood before so it definitely is either the wall paint or another variable entirely
The wall paint is plastic, which melts.
@@jessehunter362 Does latex vs oil make a difference? I've had latex peel off a few times when I've left things leaning against it but not oil (and not like the paint hadn't dried. It was 20+ years old)
I got the 3 right but i watched the boat video before so that might have helped
I didn't watch the video but the existence of the video inherently implies a weird interaction
I did the same earlier
For the dropping objects from a boat video, there is a simple way to understand this. Image you have an ultra-dense object, denser and smaller than anything you can possibly get on earth. If you took this onto a boat, it would make the boat sink very low into the water. Now, throw this ultra-dense object overboard. The boat rises up a bunch because of the loss of weight in the boat. But, the volume of that ultra-dense object isn’t the same as the boat. Thus, the amount of water displaced is LESS then when the object was on the boat, so the water level drops.
Now, another riddle that is somewhat related:
If instead of an ultra-dense object, you had a bowling ball, would throwing it overboard cause the water level to go up or down?
Answer to the riddle??
In reality water spin direction does depend on hemisphere but it has very little impact compred to other things influencing diflrection
every video you make, I always learn something new and am amazed. it really is jaw dropping science!
the coriolis effect can affect water if the bowl is big enough.
true
That's what I thought...
@@johnmclawson3982 Im mostly going off the "Does Water Swirl the Other Way in the Southern Hemisphere" vid form
Veritasium and Smarter every day. They use small symmetrical swimming/paddling pools.
Id love to see someone do it with progressively smaller pools to see when local forces overcome the earth's spin.
It does not require a significant amount of water volume. I think while 99% of these are spot on, that second one about toilet water is incorrect.
Yoo he dropped a new one, let’s go!
love your content, keep it up.
Round 3:
1: that's a tricky one, but no. in the boat, the water displaced weighs as much as the cube (+ the boat, but let's ignore that one for now).
Because the cube sinks to the bottom, the water displaced by the volume of the cube HAS to be lighter than the cube itself
This was the hardest of them all.
Not sure if you already did this but can u pls do one (truth) where peanut butter can fluoresce when it's hit with uv light
1st. One, sticking to wall doesn't look real, but it's better than. Two, sunscreen blocks ultraviolet light, not infrared. Three, capillary action at work.
2nd. I remember seeing a demonstration of the first one. Black absorbs heat better than yellow. Doesn't seem right.
3rd. Yes, objects that are more dense than water (and any object submerged in water) displace an amount of said water, causing it to rise. Water is an excellent heat sink (This can also be done with a thin water bottle in a bonfire. The fire will have to evaporate the water before it can melt the bottle.) That is a method of making super cooled water that freezes on contact. Is this the mythic all are right????? Ok, so the dense one is wrong, that's very unintuitive. Time to watch the video.
The key is that the object was in a boat before being dropped into the water.
Here's how you make the dense object off a boat make sense.
Let's say you're in a boat and you're going to take something from the water and place it into your boat.
One object is 1 cubic foot and weights 10 pounds (not so dense)
The other object is 1 cubic inch and weight 10 pounds (super dense)
Each object will weigh your boat down the same amount, displacing the same amount of water while inside your boat
However, clearly the less dense objects displaces much more water when it's outside the boat.
If your boat is like a weight pushing down on the water causing it to displace, adding anything with a density greater than water to your boat will cause a greater displacement than its own volume.
nobody but americans use "feet" "inches" and "pounds"
in 5 grade me and my friends would cover the walls in pencils on the last day of school. lol
The third round was such a freebie because you basically just showed us that they’re possible
Almost missed the last one, but switched my answer after noting something important.
I just thought back to school where they told us the mass of water displaced by a buoyant mass is equal to the mass of the object, whereas if that mass was removed from the boat it would displace less water than when it was on the boat, since it would displace it's volume instead, which is far lesser a volume of water being displaced.
that looks so good❤
Man I remember doing that cereal one in a chem class in middle school
i really went and chose D to all of these 😭
I have yet to find a paint around my parts that the pencils or anything can stick to like that. I'm wondering if you just got lucky with the right paint types or if you actually had two fake ones are seeing if any will call you out. Thing I find leans towards the second is the fact at no point did you ever show the orientation of the wall. It could have been a painted piece of drywall on the floor and would have looked the same.
Wait what?! I got all of them right! I’m no longer a disappointment! Anyways, jokes aside, this video is really amazing and gives small fun facts that are truly fun to learn and hear about!
You should've stated in the seperate video "watch 2 truths & trash before watching this"
Hol up. First time I feel I gotta call out a video. Maybe because I got got on the first one but sunscreen actually does block IR like that. You can use ir cameras to see where you’ve missed sunscreen application. 1:25
Now imma go try to stick some objects to walls
It blocks uv not ir
@@alexnewell9631the camera only detects IR. Paulec is trying to claim sunscreen blocks IR
@@dickygushybut it was false
All I did was screw up the paint on my wall
Fr I’m gonna jump off a building
in high school, wed slid pencils and other things up the wall in hsitory because the teacher didnt care. one time someone did that with an entire desk, it stayed there for a few muinutes before crashing down and startling us
[: I didn’t even notice the iron fillings in the background 1:37 :]
Round 1: A feels a bit sus, but I think it's B. Thermal cameras detect infrared radiation, but sunlight is ultraviolet radiation. So my final answer is B. (Ha! Called it!)
Round 2: Okay, B sounds very real. Black objects absorb light, and thus heat, much better than yellow objects, so the black spots on the balloon are going to get a lot warmer a lot quicker. I know that C is fake. The Coriolis effect is very real, but its effect on that size of water is going to be miniscule compared to the effect of the nozzle position, the bowl shape, etc. Now I just need to determine whether A is fake, too. On the one hand, I know that metallic iron is used to fortify cereals. But on the other hand, I've seen Ann Reardon debunk a similar demonstration in the past. Then again, I think that Ann Reardon demonstration was about calcium, rather than iron, so it doesn't necessarily apply here. I'm gonna vote C. (Yahoo! Two for two baby!)
Round 3: This feels too easy. A is basic fluid mechanics, so I know that's true. B is a little less obvious, but I think it's true, since the water could be conducting the heat away from the latex. And C feels blatantly false, since the only thing I can see keeping the water from freezing is the internal pressure of the bottle, but that should've been released when the bottle was opened. So I'm gonna vote C again. (Yeah, I'm completely stumped. Both on the tungsten thing [definitely gonna be watching that follow-up video], and on the supercooling thing. Again, shouldn't releasing the pressure undo the supercooling?)
Releasing the pressure in the bottle doesn't trigger a phase change, because the amount of pressure inside the bottle is barely above atmospheric pressure if at all.
@@serraramayfield9230 Right. I got this mixed up with videos about supercooled soda or beer.
Supercooling does not rely on pressure. It relies on not giving the water any nucleation points so it can't freeze despite being below 0C. Only when you pour it onto solid ice then it immediately freezes.
the action lab did the same prank with cereal but he added iron filings, still can't believe we eat so big iron pieces
@@alexalekos It's really not a lot compared to the volume of cereal. Besides, iron is a necessary part of our diet (and yes, as far as I can tell, our bodies _can_ process metallic iron)
Im getting better at 2 Truths 1 trash
Not just hurricanes bro. Tornadoes spin the other way too. And whirlwind.
how does the first one work? 0:12 im so confused
Object heats paint. Paint melts. Melted paint is sticky.
3:44 "super cool" I see what you did there.
Bro just proved the sun is racist
I knew the paper towel one was true because I'd done that before.
2:44 That's what happens when you're told your whole life that it does when it doens't.
It's getting harder every time.
yes but in a sink the water changed direction when draining
It's definitely getting harder. The details to trick us are also getting more creative.
I knew the wall one was real bc one time when I was on vacation with my bsf she accidentally did that and we thought it was magic lol 💀
I thought the 2nd one was wrong but instead you just used a blue light and edited the colors
2:38 The Simpsons lied to me.
After rewatching it, the boat one can be explained by simple buoyancy.
But how would toilet bowl flush on a donut shaped earth
Thought for a moment I was genius for getting all of them right, but it seems everyone else got them right as well
I knew the second one because my hair is black and gets really hot in summer😆
4:32 That can't be true because surface area still gets displaced.
Well i got all three wrong..
dude i tried doing the first one and it didn't work 1 bit
most of these are like 4th grade science experiments
im a foruth grader and ive never done any of these
What we learnt: The sun is racist.
what if you drank the water would it freeze your mouth or just kill you bc you cant breathe
1:31 it's "high in iron", they simply add iron, like for real...
0:08 tried and it just scratched up my charger. E. Multiple were trash
The wall one didn’t work
Damn.. I watched em all to quickly..
round 1 guess: E (thought they were all fake)
round 2 guess: E (thought A and C were fake)
round 3 guess: D
Round 3 A
I watched the boat video before this
Round 2 A
😇Hi, thank you for sharing your video. I'm glad to be here. Hoping to watch more videos from you, keep on sharing and always have a great day ! - greetings from our family Kapiso mo Vlog 4:47
wait so what does sunscreen do
Great way to scratch your wall
3rd ones true i did this in science class
2:42 but- wha- BUT THATS REAL -
nuhuh
#underrated
3:39 c
Round 1: I thought none were fake, since I knew C made logical sense and same for B, but apparently I forgot the device measures heat and not radiation
Round 2: Easy dub. Third one seemed too good to be true. Obviously water isn’t affected by the opposite magnetic poles and the two hemispheres don’t rotate differently.
Round 3: I thought the third and second were fake. The second because even though water is able to counter fire, I thought the balloon would regardless still be fragile enough to pop. The third one I have seen before, but the videos I watched about that never used salt, and I thought that since salt can help with melting ice, I concluded that the method in this video was ineffective.
Round 2 actually had more legs than you might think. Look up the Coriolis effect, it's really interesting.
I actually thought the second one in the first round was fake because you should use a UV camera and not IR and that's the point. But I thought all of them were fake due to the difference in the amount of water in the bowls, and the sticking one is just a shocker for me since I've never heard it - but, in my defense, most walls in my country aren't painted, unless it's like hospital walls, they have wallpaper or tiles on them
And the third round is the only one where I instantly found the true ones since I've heard of both of them before
I’ve always hated that the one that requires the most explanation gets the LEAST explanation. PLEASE explain how water moving from one bowl to another through paper towel makes logical sense!
@@Carl_with_a_k_ Capillary action. The tiny spaces in the paper towel pull the water in like the pores of a sponge.
@@Carl_with_a_k_It sort of _sticks_ to the fibers in the paper towel, then surface tension tries to pull it back. The sticking force is too strong though, so it basically hoists itself along.
0:51 c
dayum, this is the first time i totally failed. gg
I got all three wrong. I hope i get some "special" reward now. :S
I think A and C are fake for round 2
2:12 b
[: i only because I knew that the other two were real 2:13 :]
1:59 the sun is racist
For round 3 A is fake. The water level should even go down
No?
@@therealestspadeS Yes, because when the object is in the boat, it's held up by buoyancy, which is equal to the weight of the displaced liquid. But when you throw it in the water, it sinks to the bottom, which means the buoyancy force is less than when it was in the boat. In other words, it displaces less water. So the water level drops.
@@lucasbrelivet5238 that’s… not how that works, that’s like saying if you add a one inch thick sheet of metal or something to a bathtub, the water level will go down
@@therealestspadeS It will if that sheet of metal was originally in a boat floating on the water in the tub.
@18million231 You can watch his follow-up video, it explains it well and demonstrates it experimentally.
Round One: A
Round Two: C
Round Three: B
I only got round Two right
The Simpsons lied to me
R1 A or C
round 1 i think B is fake
round 2 i think A is fake
round 3 i think A is fake
C or B R3
3 for 3
it didnt work bruh
A is fake for round 1
aca (got the first wrong)
I think B
BRUH THE ONE THAT NEEDS THE MOST EXPLANATION IS ALWAYS THE ONE THAT DONT GET EXPLAINED!!!!! How the FUCK is Paper towels transporting fucking water??????!!!!!!!!
If you came here for you daily does of science
👇
You can also just put the water in the freezer it just doesn’t work perfectly every time
I believe the experiment requires purified water which is why simply tossing a bottle in the fridge doesn't work. Not pure enough.
@@fulomtheavali it works if you use baby water, distilled water, artesian water or any sort of purified water, it just can’t be tap water or mineral water
R2 A
B1
C2
B3
2/3 the first don't make sense bot aight
YOO
A
E, both a and c were fake
the first one is fake
1st comment???
b
The video says on view but has 4 like s ???