SCIENCE CLASS #4- How to Waterproof Your Hand

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  • 게시일 2020. 03. 29.
  • Lots of juicy demos relating to surface tension! NO CLASS THIS WEDS!! I'm filming one of my normal monthly videos that day. Back on Friday though!!
    Go check out Dianna's awesome channel- • HOME CHALLENGE: 20 Eas...
    CHALLENGE- float as many paper clips as you can and then come up with a creative way to ruin the surface tension and have them all sink. Tag me on any social media with your responses.
    Question for next time- How do astronauts weigh themselves when they are floating and weightless.
  • 과학기술

댓글 • 2.1K

  • @MarkRober
    @MarkRober  4 년 전 +1431

    Thanks for attending! Remember, no class on Weds because I'm filming a normal vid but we'll be back on Friday with a super juicy one!

    • @shadowshox6899
      @shadowshox6899 4 년 전 +58

      You are the best science teacher I have seen

    • @Rom-mg5np
      @Rom-mg5np 4 년 전 +7

      Nice video

    • @tristancalderin9057
      @tristancalderin9057 4 년 전 +23

      Hi I have a question why is water clear

    • @NITME2
      @NITME2 4 년 전 +13

      You should be an actual teacher
      I even sent the link to your science lessons to my school teacher to show her I'm doing science
      Also I'm 2nd

    • @aldricbenalan4755
      @aldricbenalan4755 4 년 전 +4

      Nice Video!!

  • @chrisfix
    @chrisfix 4 년 전 +18

    Nice job Mark! This is the future! Having super qualified and amazing teachers teach more than just 20 students at a time! Keep it up!

  • @TheBuxomHobbit
    @TheBuxomHobbit 4 년 전 +183

    Love it! You'll make a great Physics teacher! But remember
    If its green its Biology
    If it smells its chemistry
    And If it dosent work it's a Physics experiment. ;-)

  • @RingOfShameful
    @RingOfShameful 3 년 전 +69

    If only he became a high school teacher before I would graduate XD

    • @jamesthedranged1241
      @jamesthedranged1241 3 년 전 +2

      Yes

    • @supermoonwalker8053
      @supermoonwalker8053 3 년 전 +2

      For me he has one year and a different state to travel to. Fingers crossed

    • @Behhhhhhhh
      @Behhhhhhhh 2 년 전 +1

      @@supermoonwalker8053 next thing you know your new/substitute teacher is mark rober

    • @Behhhhhhhh
      @Behhhhhhhh 2 년 전 +1

      I’m probably too late but hey… how did it go?

  • @JordanGrant98
    @JordanGrant98 4 년 전 +933

    Hey Mark, when I tell my kids that Science Class is on with Mark Rober, they RUN to the TV to turn on the show. They love what you're doing and they're learning a lot. I hope you're able to keep doing it for a while!

  • @palppalp4458
    @palppalp4458 4 년 전 +598

    Imagine the NASA scientist dreaming of one day being a school teacher.

    • @alomysf3211
      @alomysf3211 4 년 전 +17

      After all teachers teach scientist to make them who they are.

    • @DanNguyen-oc3xr
      @DanNguyen-oc3xr 4 년 전 +2

      What is this timeline?

    • @DucNguyen-rk8zu
      @DucNguyen-rk8zu 4 년 전 +1

      @@DanNguyen-oc3xr the mess up one

    • @abc-yg6tk
      @abc-yg6tk 4 년 전 +21

      You need more people like him as teachers in the USA, maybe then half of the USA population would not vote for Trump

    • @realkshitijraheja
      @realkshitijraheja 4 년 전 +2

      @@abc-yg6tk yes I love mark as my teacher and will be dream come true

  • @nostalgicaf4652
    @nostalgicaf4652 4 년 전 +403

    Mark: *demonstrates surface tension of water on a penny*
    Also Mark: “that makes CENTS”

  • @kevinmello8733
    @kevinmello8733 4 년 전 +17

    Can we all just take a moment to say thank you to mark for making us these awesome videos 😁

  • @kba
    @kba 4 년 전 +1689

    Everyone: WASH YOUR HANDS
    Mark: How to waterproof your hands

    • @wolley2087
      @wolley2087 4 년 전 +14

      @@newzanyt1627 no

    • @Willbravo886
      @Willbravo886 4 년 전 +13

      Yet he said to wash it at the end of the vid to defeat it

    • @mehdimalekmohammadi1498
      @mehdimalekmohammadi1498 4 년 전 +26

      Mark rober is a legend. He shall never be talked behind his back.

    • @kba
      @kba 4 년 전 +8

      @@Willbravo886 He also made a video showing how easily germs spread and why it's important to wash your hands.

    • @BoomsterX
      @BoomsterX 4 년 전 +5

      No No he's got a point

  • @sietse1994
    @sietse1994 4 년 전 +322

    That moment you are actually sad there is no class on wednesday

  • @deuscaritasest7518
    @deuscaritasest7518 3 년 전 +8

    going to the comment section is the equivalent of talking to your friends when the teacher is explaining something

  • @gostudypeople
    @gostudypeople 3 년 전 +4

    I literally have never seen such an interesting live stream .The live classes were really informative . Thank you so much Mark !🐶

  • @wolley2087
    @wolley2087 4 년 전 +197

    Mark Rober: makes a video about washing your hands
    Also Mark Rober: how to prevent washing your hands

    • @1.4142
      @1.4142 4 년 전 +3

      The soap will take off the hydrophobic coating though.

    • @wolley2087
      @wolley2087 4 년 전 +1

      @@1.4142 science...fun

    • @muncepii
      @muncepii 4 년 전 +2

      How to copy a comment after saying no to making it a meme

    • @wolley2087
      @wolley2087 4 년 전

      @@muncepii I didn't copy that comment, if you think about it we are both talking about different things
      And also when I said no I was joking, damn

    • @wolley2087
      @wolley2087 4 년 전

      @@muncepii i also said no after this comment so I don't understand your comment

  • @brandonchen7025
    @brandonchen7025 4 년 전 +179

    This dude who literally worked for NASA to help build the Rover is now teaching us high school physics.

  • @tokencat5069
    @tokencat5069 4 년 전 +65

    Mark: Stops working at NASA to be a KRplusr
    Mark today: I WANT TO BE A SIENCE TEACHER!!!

  • @kitchengun5773
    @kitchengun5773 4 년 전 +1

    Thank you for the message at the end Mark my father is an ER doc and he is at age 57 and has high risk he is still expected to work and can not Bring/wear his own gear and the hospital is not providing the proper equipment for the medical staff so things have been ruff but watching your videos cheers us up and we are very happy that others are being recognized for the risk they put themselves at for the well-being of others

  • @evol-yu4mu
    @evol-yu4mu 4 년 전 +33

    Mark, you are amazing. It's so much fun watching you have fun.
    I like how you make something positive out of this crisis.
    This is something we should all do, follow our dreams. And yours is simple; to teach.
    That example, that statement, is powerfull. I aplaud that.
    To everyone; do what you like (as long as it's safe).
    follow your dreams, and try to work around the crisis like mark is doing.
    Stay safe and healthy, keep it going, lots of love from the netherlands.

  • @feature3292
    @feature3292 4 년 전 +207

    No'one:
    Mark: *Spends times helping kids learn on his own time and being a very geunine nice guy*

    • @domirusz24
      @domirusz24 4 년 전

      *Noone*

    • @drew_peacuck5211
      @drew_peacuck5211 4 년 전 +2

      [everyone liked that]

    • @pswand1
      @pswand1 4 년 전 +2

      What about coyote Peterson

    • @TheMixxon2
      @TheMixxon2 4 년 전

      Umh, this isn't science, it's just a funny demo and he is 100% getting money from his videos so, what else better could he do ? That's a rhetorical question, no response needed. Just stating the facts.

    • @NN_02
      @NN_02 4 년 전

      Stonks 100 📈

  • @rachellugo1935
    @rachellugo1935 4 년 전

    You are amazing! I have added one of your lessons a week as an additional optional science lesson for my class and the majority of them are doing it and with such enthusiasum. You are going to be a Fantastic teacher! Keep it up :)

  • @HeyitsJay69
    @HeyitsJay69 4 년 전 +134

    Mark: I what to be a physics teacher 4 minutes later uses hot wheels track to point on the board

  • @Sohamsta
    @Sohamsta 4 년 전 +339

    Instructions unclear: now I'm unable to wash my hands
    *how will I defeat the coronavirus?*

  • @elizabethgiovanni8808
    @elizabethgiovanni8808 4 년 전 +309

    Mark: No, you guys can't hold hands.
    Me: are you saying that water molecules have to go on quarantine too?

  • @theinsaneone8975
    @theinsaneone8975 4 년 전 +40

    My friend: so what is your favorite song genre?
    Me: it’s complicated... 11:43

  • @codysharp
    @codysharp 4 년 전

    Mark, it's really awesome to see how much more comfortable you're becoming with doing live stuff. This will DEFINITELY help with your being a teacher, which, with all of the enthusiasm you have towards the content you want to teach, will be FANTASTIC! I told my 13 year old that I'd LOVE to sit in one of your classes after you become a teacher, I think you'd be an awesome addition to the teachers of this country!

  • @jimmythefish
    @jimmythefish 4 년 전 +3

    Mark you’re amazing. I’m working from home this week and your class will be part of my curriculum. Thank you so much. My kids absolutely love you.

  • @Mr-vk2zg
    @Mr-vk2zg 4 년 전 +69

    Simple math: Mark + Rober = BEST TEACHER EVER

  • @varsha8626
    @varsha8626 4 년 전 +1

    Mark, this video was just amazing!! I’m a literature student now but I used to be really into physics and chemistry two years ago. This really made me miss all the cool experiments I used to do and the “oooohhhh” moment when I learned the science behind it. Thank you so much 💫

  • @zaid2986
    @zaid2986 3 년 전

    I just want to thank you because you are such a good teacher and you make any concept super clear and I can’t say my teacher was bad but you are better and I feel I get smarter every video

  • @sealdog6360
    @sealdog6360 4 년 전 +35

    Are we going to ignore that he used a hotwheels track to point 😂 4:23

  • @Willbravo886
    @Willbravo886 4 년 전 +232

    School: closes
    Mark: *hold my beer*
    Also the soap is a dad to a daughter and a boy which are two molecules. Analogies :)

    • @videoket
      @videoket 4 년 전 +2

      I don't think Mark drinks. But I too dig the analogies. So good. :)

    • @Willbravo886
      @Willbravo886 4 년 전

      RoanStone lol "hold my beer" is a popular phrase to show someone going to accomplish something or do something

    • @randombomb5573
      @randombomb5573 4 년 전

      Hold my water

    • @shelletonianhuman
      @shelletonianhuman 4 년 전

      It's more like hold my orange juice

    • @Willbravo886
      @Willbravo886 4 년 전

      Samuel Hautamäki or hold my beaker or hold my watermelon juice lol

  • @ClaimingKarma
    @ClaimingKarma 4 년 전 +2

    I just want to say I envy the students that get the pleasure of being in your class when you get to being a teacher

  • @lj9174
    @lj9174 4 년 전 +1

    Mark Rober, if your reading this, I love your vids, and your probably helping all of us power through this whole corona virus thing with your science classes! You're so awesome, so keep doing what you do! (You're my favorite youtuber btw)

  • @Aepek
    @Aepek 4 년 전 +12

    5:19 Video Start
    Love these vids your doing, & we are able to include them into the “schools” lesson plans for actual credit👍🏻
    Know some schools may not allow this, but my nieces does, it’s so cool. She likes the fun crazy projects
    Be Well🤙🏼

  • @beefymcskillet5601
    @beefymcskillet5601 4 년 전 +16

    Last time I was this early Mark was still at NASA

  • @dmcy2k
    @dmcy2k 4 년 전 +68

    "How do astronauts weigh themselves when they are weightless and floating in space?"
    Easy, they use the "Watermeloninator" which launches a watermelon at their center of gravity (mid section) where an astronauts equal and opposite reaction can be measured (F=ma) to calculate their weight on earth.

    • @NN_02
      @NN_02 4 년 전 +5

      Mark Rober wants to know your location

    • @dmcy2k
      @dmcy2k 4 년 전 +1

      @@NN_02 Ohio

    • @gameplayer9960
      @gameplayer9960 4 년 전 +14

      Instructions unclear, I threw up when the watermelon hit me in the midsection.

  • @dogedog3143
    @dogedog3143 3 년 전 +57

    418 dislikes were the molecules who lost the tug-o-war...
    Jk

  • @HarryU99
    @HarryU99 4 년 전 +18

    "it's a beautiful Monday"
    *Impossible*

  • @owenthompson5511
    @owenthompson5511 4 년 전 +9

    The moment when you're sad cause you find out there's no class on Wednesday, then realize he's making a killer video instead!!

  • @strangerjust5491
    @strangerjust5491 3 년 전 +1

    He is really really good. I mean he is so smart and I love watching his videos.

  • @whackoma
    @whackoma 4 년 전 +2

    I remember in my physics class how there’s artificial gravity and quite simple formulas to calculate the required rotational velocity for the centripetal force to emulate the same force as gravity, but thinking about other methods is awesome as well, like wouldn’t you weigh less the further you are from the earth or a big ball of mass and how I don’t think your mass would change but depending on how far you are from celestial bodies greatly changes gravity’s effect on yourself.

  • @colyn4663
    @colyn4663 4 년 전 +11

    Sorry I was late for class Mr Rober, I had English class today at the same time

  • @hk-rz9uz
    @hk-rz9uz 4 년 전 +42

    No class on Wednesday 'I'm sorry'
    If it were any other class that would be unnecessary

  • @thettenbach
    @thettenbach 4 년 전

    Love the pepper demonstration! Did this WAY back in elementary school for show and tell. Learned it all from Mr Wizard - he had an episode of the same thing. Ahh, memories. Thanks Mark!

  • @sesameseeds777
    @sesameseeds777 3 년 전

    The only science class I will ever attend (hopefully). Mark is actually interesting, explains things in an easy to understand format, and his voice isn't boring or flat. Other science classes explain things it a format I will never understand, their voice is so boring and flat I want to fall asleep, and don't use examples and diagrams. My real-life science class does use models and an easy to understand format, but their voices make me wanna fall asleep and the concepts they want to teach me are impossible to get a grip on without being explained properly. This is one of two science/engineering channels I will willingly watch, keep making great vids and thanks for teaching me! :D

  • @osotanuki3359
    @osotanuki3359 4 년 전 +43

    My takeaway from this video
    Water molecule: *Hugs its friend*
    Soap molecule: "HEY, NO PDoA!!!"

  • @paulallen8329
    @paulallen8329 4 년 전 +4

    Mark i don't how to say it. YOU'RE THE BEST HUMAN BEING EVER EXISTED

  • @dianahampton8768
    @dianahampton8768 2 년 전

    Mark, your videos are fantastic thank you. You did leave out an important factor with water going up the trees: transpiration. The evaporation of the water out the pores of the leaves creates a pull like sucking on a straw and pulling the water out of the tree. Cohesion and adhesion assist in this, but will not alone cause the water to climb high enough, it’s the pull from the top, the tension at the top working with the two forces That causes the upward movement of water. You probably already know this but I thought it was important point to share. Thanks again for your inspiring work.

  • @isabellacarnes8982

    You make my day so better I wish you were my Science teacher! Keep making videos thank you

  • @dictolory
    @dictolory 4 년 전 +9

    Mark : Eli come help me
    Also mark : Get out of here

  • @benguo9452
    @benguo9452 4 년 전 +5

    You know class is gonna be interesting when he uses a hotwheels track for a pointer.

  • @Megamaniac15TF
    @Megamaniac15TF 4 년 전

    Y'know, I've only recently heard of Mark. Been watching some of his videos. I have to say, it's nice to listen to an honest, nice guy. This guy is a gift to this world and I hope more people listen to some of his videos. It could really make the world a better place.

  • @ivorybarca7943
    @ivorybarca7943 4 년 전

    Mark you really are the Bill Nye of a new generation, I really love your videos and you have had more impact in my future than many of my "actual" teachers, so, keep it up m8

  • @BenFenner
    @BenFenner 4 년 전 +5

    "Weighing" a person in space, I'm envisioning a slow-spinning cylinder a person can strap themselves inside of off to one side, and a force/strain gauge measures deflect, math happens, then you get a "weight" (probably actually a mass).

  • @dpmichaels4931
    @dpmichaels4931 4 년 전 +4

    There is usually some amount of gravity. Anything with mass has gravity. To see how much you weighed you would need a control, such as weights. You could then use a digital scale. If you put (what was on Earth) one-hundred pounds on the scale and it read as 1.5 (just an example) pounds. You would then get a unit rate of 66 and 2/3 pounds for every one pound wherever you are in space. If you then wieghed yourself you would take whatever weight the scale measured and multiply by 66 and 2/3,

  • @PeanutBrittle04
    @PeanutBrittle04 3 년 전

    BRO UR THE BEST GUY TO TEACH... U MAKE SURE THAT EVERYONE UNDERSTANDS THE TOPIC USING CREATIVE WAYS. THANK YOU!!!!!!!!!!
    I AM FROM INDIA

  • @jacobrosario8625
    @jacobrosario8625 4 년 전

    i really love how a lot of the science community on youtube are mostly friends. it makes for some really great crossovers when they interact. my favorite had to be when you were on smarter every day and captain disillusion.

  • @keeganlewick1030
    @keeganlewick1030 4 년 전 +6

    "How can astronauts weigh themselves when they are weightless in space?"
    First of all, Mr. Rober, I am a huge fan (as many are) of your work. My dad and I eagerly await your every post. I believe that the creativity levels you bring to your videos are unmatched by any other KRplusr. Physics is by far my favorite subject because your videos show me how far it can take you.
    My solution to this physics challenge uses centripetal force. Any net force, according to Newton’s second law, is equal to mass multiplied by acceleration. Centripetal force is a net force and very fittingly you use centripetal acceleration with it. Centripet acceleration equals velocity squared divided by the radius of the circular motion path. This means the centripetal force equals mass multiplied by velocity squared divided by the radius (F=m×v²/r). This can then be rearranged for mass to get the equation m=F×r/v². Therefore, to calculate the mass, we must measure the centripetal force, radius of the circular path of motion, and the velocity of the astronaut. This can be accomplished with the following procedure:
    1) Secure a very lightweight bike wheel to the floor of the spacecraft and attach a heavy duty force sensor to a part on the edge of the wheel.
    2) Before anything, measure the distance from the axle of the bike wheel to the edge of the force sensor (where you will be hanging on to).
    3) Give the bike wheel some initial angular velocity and then grab onto the end of the force sensor attached to the wheel so that you are spun around in a circular path.
    4) Wait until the force sensor reading levels out and record that value as the centripetal force in Newtons.
    5) While the force sensor reading remains at this constant value, measure the time it takes you to complete one full revolution.
    6) After measuring all those values, safely stop by grabbing the axle of the bike tire that is not spinning.
    The velocity (v) in the equation for mass using centripetal force can be found by dividing the circumference of the astronaut's circular path of motion (2πr) by the time it took to travel one complete revolution because velocity is distance over time. Then, you plug this and the other values back into the equation m=F×r/v² to get the mass.
    This method measures the astronaut’s inertial mass or their resistance to changes in motion, rather than the gravitational mass because inertia is all we have to work with in space. In this case, the astronaut’s mass wants to leave the circular path of motion it is caught in, but the centripetal force is keeping the astronaut in orbit about the bike axle. How much the astronaut resists this change in motion is what we are calculating here and it gives us the mass.
    I apologize for how long this answer is. I just wanted to be as specific as possible. I had this other idea about using the equivalence of impulse and momentum, but I figured that this was much more interesting, creative, “over-engineered” as you would say.

    • @kidglockboi3555
      @kidglockboi3555 4 년 전 +2

      Dam kid

    • @altalbum
      @altalbum 4 년 전 +2

      Am I one of the only people that read this all but didn't understand a lick of what he just said.
      I wish I was in a Physics class right now...

    • @____-pb1lg
      @____-pb1lg 4 년 전 +3

      Bravo 👏

  • @anuvaishnav9460
    @anuvaishnav9460 4 년 전 +34

    High budget sound effects 14:36

  • @tevitamanning1357
    @tevitamanning1357 3 년 전 +2

    i learn more from marks youtube channel than actual school. and i wish i had mark as a teacher it would be so awesome

  • @typicaltrends5422
    @typicaltrends5422 4 년 전

    First teacher I know to teach a whole lesson on 2hr schedule timing👏👍🏼

  • @felixk.4135
    @felixk.4135 4 년 전 +5

    When mark becomes a physics teacher, he should make sure that his board pointer is a hot wheels track.

  • @paullux0722
    @paullux0722 4 년 전 +32

    Did anyone notice he is using a hot wheels track part as a stick ?!!!! 😂😂

  • @YannickChasles
    @YannickChasles 3 년 전

    For Diana question you can push with a fix force and look at the acceleration or with a fix acceleration and look for the force needed.

  • @louisjameslago2692

    I always learn something new in every video you post. Sad to say, I'm not able watch it live because of the different time zone. But I always watch it after I get out of bed😂
    I really love science and I'm really thankful to you @Mark Rober

  • @KingSquriell
    @KingSquriell 4 년 전 +6

    The soap is like a high school principal

  • @EpicGamers-oy8il
    @EpicGamers-oy8il 4 년 전 +10

    How other people waterproof :
    How I waterproof stuff : ULTRA EVER DRY

  • @jufmi9
    @jufmi9 3 년 전

    I just want to say that the way you teach is in my opinion the best way to go about it. For me at least, I learn and memories subjects the best when I get a mental model, only then do I feel like I fully understand it, which is exactly what you do. So if this is how you want to teach at schools, your students are going to love you. You'll be THE mister Rober from school, not just that famous guy from the internet (at least, that's how it worked at my school, the best teachers get school-wide recognition). Good luck!

  • @inosukehashibira8713
    @inosukehashibira8713 4 년 전 +1

    The only class I enjoy

  • @mahmouddahroug435
    @mahmouddahroug435 4 년 전 +13

    Answer to question:
    Answer 1: Maybe astronauts go into a spinning room like a ring. This creates artificial gravity and they can use the weigth equation F = mg to determine their mass but with the centrifugal force.
    Answer 2: they count the number of protons and neutrons in their body(joke).
    Answer 3: they put a scale on the wall and jump off it. The scale tells their weight (this might not be accurate though)
    Answer 4: they push themselves against the wall? Or use big rubber bands that are stuck to the floor and pull them while they are on the scale.

    • @justaregulartoaster
      @justaregulartoaster 4 년 전

      1: that's artificial gravity, but not present on every space station.
      2:
      3: depends on how strong they jump too, which is anything but accurate
      4: again, depends on how much power they use, which can't be fixed
      My guess is they move the scale upward at a GIVEN speed and force for like a second. The result can be calculated.

    • @renchen282
      @renchen282 4 년 전

      I've come up with a very inefficient method that's also kinda funny:
      1. have an astronaut jump off a wall at the end of a corridor and stay still
      2. have 3 measuring gates/detectors that measure the time it takes for an object to travel, 1 at the wall, 1 at 5m away, and 1 at 10m away
      have an object that has a known mass(say a soccer ball that has a mass of 450g) at the 2nd gate
      3. when the astronaut bumps into the soccer ball, measure the time it takes for the soccer ball to reach the third gate
      4. do some quick maths: By conservation of momentum, you can set up an equation for calculating the astronaut's mass
      (soccer ball's mass)(velocity of said soccer ball)=(Astronaut's mass)(velocity of astronaut)
      450 g 5 m/time between 2nd & ? 5 m/time between 1st &
      3rd gate 2nd gate
      5. PROFIT

  • @1.4142
    @1.4142 4 년 전 +5

    Astronauts could use elastic bands to pull on them as acceleration equivalent to gravity, and measure weight using a scale

  • @kylecarr7332
    @kylecarr7332 4 년 전 +1

    I have to say if mark becomes a high school teacher I’m going to be very upset I finished highschool😂 I feel you would make the absolute best high school physics teacher in the world! My physics teacher was absolutely amazing and I still feel I understand more just from one video than I did a semester with him.. it’s incredible that you alone have positively influenced more people than most on the earth.. the words you speak now will undoubtedly influence our future forever and it’s amazing!

  • @SuperCamilo2
    @SuperCamilo2 4 년 전

    thanks for teaching us man... genuine dude

  • @AD-mo8tu
    @AD-mo8tu 4 년 전 +7

    Imagine water molecules holding hands during cohesion and they say red rover red rover send soap over

  • @Kayak7seas
    @Kayak7seas 4 년 전 +21

    How do astronauts weigh themselves in space? A space-ial scale :D

  • @quikwidit6967
    @quikwidit6967 4 년 전

    Thank you for the video Mark. Much appreciated as always

  • @H-Caraccio
    @H-Caraccio 4 년 전

    You make learning so much fun. Keep it up Mark.

  • @jackmelton4139
    @jackmelton4139 4 년 전 +6

    Fridays lesson: Ok kids lets talk about how to soap proof your hands.

  • @Courier1733
    @Courier1733 4 년 전 +7

    Cave Johnson here, On the contrary to what i usually say, you're hired

  • @carmineivanmango1733

    I have watched every single videos you have posted and every time I watch you I get more knowledge, more inspired and more convinced. Convinced on the fact that if I had a teacher like you in high school I would have taken much more seriously my studies, convinced that without passion you cannot teach anything, because if you want to learn anything you must feel passionate about it. I really hope that you can fulfill your dream because the world needs passionate teachers.
    Also what would you say about a good collaboration video with Because Science after all this covid havoc is over I would really love to see that

  • @jeremiahslone9762

    Best class ever love watching these videos

  • @johiahdoesstuff1614
    @johiahdoesstuff1614 4 년 전 +23

    Me, an 18 year old, tuning into middle school science class.

    • @calleighmonton8464
      @calleighmonton8464 4 년 전 +2

      Johiah plays games Welcome back to 7th grade mate. 👌👌

    • @mmmk1616
      @mmmk1616 4 년 전 +2

      Me, a 60 year old, tuning into school science class :) Still learning at 60!

    • @gameplayer9960
      @gameplayer9960 4 년 전 +1

      I'm 21. :O

  • @BlankRequest
    @BlankRequest 4 년 전 +22

    Honestly this one was the easiest yet, just use ULTRA- EVER DRY.

    • @Sohamsta
      @Sohamsta 4 년 전 +3

      Big brain

    • @spicetothemax7589
      @spicetothemax7589 4 년 전

      I was thinking you could just use the spray-on shoes from Cloudy with a Chance of Meatballs

  • @randomtrouble21
    @randomtrouble21 4 년 전

    Hey Mark, just wanted to say: 1) Thank you for making these videos, and 2) Since your first live video, I can really see an improvement in your lessons! The first few are always tough, but all teachers start somewhere (just not typically on such a large scale 😅). Just know that you are definitely on the right track, even when it feels like you're floundering. Good luck with everything!

  • @RekiemStyle
    @RekiemStyle 4 년 전

    Thanks a lot, I love these series!

  • @ManuelM107
    @ManuelM107 4 년 전 +5

    They wheigh themselfs with mass? Like a current or something that measures their mass. Cause wheight is dependant on gravity, but mass is constant.

    • @Binghi_
      @Binghi_ 4 년 전 +1

      Actually when you go to the doctor and you’re on the scale with the balance on top is actually measuring your mass and the doctor just says it’s your weight. So the real dilemma is to figure out your mass.

  • @baljazz
    @baljazz 4 년 전

    Awesome seeing how all these youtubers are going back to there roots. No fancy cameras or lighting or anything.

  • @aleksandargapkovski8055

    Definitely my favourite class

  • @ThatGuyMagnum
    @ThatGuyMagnum 4 년 전 +4

    I love how much more confident he's become in just a couple of lessons. He's really popping on live now!

  • @JackHandelman
    @JackHandelman 4 년 전 +16

    Day 5 of asking IF THE UNIVERSE IS EXPANDING WHATS IT EXPANDING INTO

    • @zachmalta9158
      @zachmalta9158 4 년 전

      Christopher Wallace only god knows

    • @pjt1090
      @pjt1090 4 년 전 +1

      it expands into the accurate science term. 'nothing'

    • @danielrdrigues
      @danielrdrigues 4 년 전 +1

      The dome

    • @johngerken4263
      @johngerken4263 4 년 전

      He has probably seen this but wont do it for 2 reasons.
      1. It is above a high school science class level.
      2. I could potentially spark a Big Bang vs. Creation argument.

    • @danielrdrigues
      @danielrdrigues 4 년 전

      As a science KRplus, I don't think he should discuss creationism.

  • @urhiredhr421
    @urhiredhr421 4 년 전

    Amazing, simple demonstration about soap and the virus!!!!! Great job.

  • @kota8.19
    @kota8.19 3 년 전 +2

    This is the science class I'd attend

  • @christopherbudden1652
    @christopherbudden1652 4 년 전 +22

    The irony is that my uncle worked for nasa and said he had a ‘magic touch’ that could push away the pepper on the water being four at the time I believed it was magic

  • @AshleyLynn918
    @AshleyLynn918 4 년 전 +24

    Anyone else’s OCD going wild when he kept putting the bowl on top of the penny?

  • @abhaychandra2624
    @abhaychandra2624 4 년 전 +1

    YOU ARE DOING VERRY GREAT!!!!
    PLEASE DONT STOP UPLOADING
    LOVE FROM INDIA!!!

  • @user-sc5dy6ur2h
    @user-sc5dy6ur2h 4 년 전 +1

    We can tie a spring (non deformable spring) on the wall of the space shuttle and tie the other end of the spring to ourselves and throw something away from us to get a force ,and then calculate the time period of oscillation(but do watches work in space?) and we can use T= 2pi (m/k)^1/2 (we can find k by F/x)......and then multiply m by 9.8 to get our weight☺

  • @Pyromatic6
    @Pyromatic6 4 년 전 +52

    "How do astronauts weigh themselves when they are weightless in space?"
    There's a difference between mass and weight. Mass is always there, it comes from all the atoms that make you up. Weight, however, is simply mass with a reference point for acceleration. on Earth, we feel an acceleration force of 9.81 meters per second squared due to gravity. All the astronauts have to do is create an acceleration force using various methods.
    1: Centripetal force. This is the most common method shown used in sci-fi. Essentially a large ring that is spinning, people can stand on the inside of it and they feel a force pushing away from the center. (Technically it's the outer walls of the ship pushing in towards the center. The outward pushing force we feel is just our perception.)
    2: Elastic or tension bands.Basically a large rubber band, and the exact amount of force to stretch it to a given length is known. Astronauts can kick off of a wall for example while attached to that and by the time the elastic is able to bring them to a stop, it will have stretched to a particular length They can deduce thier mass from the exact length.
    3: Spring or elevator. Basically the same as the last one, except instead of using tension force, this uses compressive force on something like a spring.
    4: Spinning with a heavy object. Similar to the first idea, except in this case you are holding an object of known mass while spinning. Hold it at extended arms reach, note the center point of rotation. Then hold it close to you, and note the center point of rotation. By finding the difference of these two points, along with knowing the exact mass of the object that you are holding, you can calculate your own mass.
    5: Throw objects of known mass. If you know the exact mass of an object you are throwing, you can calculate your difference in velocity before and after throwing it. Using conservation of momentum, you can use that ratio to deduce your own mass.
    6: Time dilation. Everything with mass has gravity, and gravity dilates time. The exact formulas for time-dilation are well-known, so you can reverse-engineer your mass using these formulas. Take two atomic clocks, hold one of them X distance away from you, the other one Y distance away from you for a specific amount of time. Calculate the exact difference in their times, and using the equation for time dilation you can reverse-engineer your own mass.

    • @giorgitsiklauri1283
      @giorgitsiklauri1283 4 년 전

      @@varun4586 You are moving while holding an object of known mass and measure your speed, then you throw an object measuring the speed of the thrown object and your speed then you can use conservation of momentum.

    • @shadymahmoud1524
      @shadymahmoud1524 4 년 전 +4

      My guy, you could've just said weight and mass is different 😂 thanks for the essay will use it for my actual science class

    • @1.4142
      @1.4142 4 년 전 +1

      for #5 you measure both velocities and object mass and use newton's 3rd law to find your mass.

    • @cormacwhite3463
      @cormacwhite3463 4 년 전

      Science simp

    • @mina86
      @mina86 4 년 전 +3

      2. They cannot push themself away from the wall though. It has to be a controlled force or else they length of the band will depend on their strength in addition to their mass.
      6. Sadly that’s impractical for masses, distances and environments astronauts are in.

  • @tokenchan8497
    @tokenchan8497 4 년 전 +11

    Next episode: Man turn himself into pickle

  • @rileyalfonso9731
    @rileyalfonso9731 4 년 전

    Thank you so much with no class this is amazing

  • @maryn1385
    @maryn1385 4 년 전

    I totally agree with your explanation of surface tension. A net getting spliced is pretty close to what really happens, with the tales of the soap braking the h-bonds.

  • @c-wade1961
    @c-wade1961 4 년 전 +12

    Breaking News: Wilson Basketball is the Corona Virus