How does a whip break the sound barrier? (Slow Motion Shockwave formation) - Smarter Every Day 207

  • Published: 28 December 2018
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    Check out Derek's video about Schlieren Photography on Veritasium!

    The awesome German Paper:

    University of Arizona paper:

    History of Shock waves:


    April Jennifer Choi is a Mechanical Engineer and Professional Whip Artist from Peoria, IL. She has a Master's Degree in Computational Fluid Dynamics as well as several Guinness World Records in Whip Cracking. April is also a well known Fire Performer and you can check out what she does on Social Media through these links.

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    “Information related to UAH contained in this video is subject to change by the appropriate officials of The University of Alabama in Huntsville without prior notice. Material and information in this video do not serve as a contract between The University of Alabama in Huntsville and any other party and do not serve as an endorsement of any paid sponsor of this video.”
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Comments • 7 484

  • Malik McPherson
    Malik McPherson  10 months back

    Bruh instant subscription

  • bot TINYBOI0_0
    bot TINYBOI0_0  24 hours back

    Just like my dad

    • Link Plays Okay
      Link Plays Okay  1 days back

      My dad's belt can beat 100x sound barrier

      • Flame
        Flame  2 days back

        Imagine getting 🙌 wool by that

        • Samuel Nolasco Nolasco

          1:19 That was sad

          • Master Hans
            Master Hans  3 days back

            Isn't because the top of the whip pass through the speed of sound ? So it creates a shockwave 🤷

            • G K
              G K  3 days back

              Whips are her kink

              • Nadia Broholm
                Nadia Broholm  3 days back

                If some of my classmates sere watching this they whould prob say: she must be really good at slavery

                Yep thats sometimes my class on a Daily basis....

                • Eric Carrington
                  Eric Carrington  3 days back


                  • Eric Carrington
                    Eric Carrington  3 days back

                    Ever snap a snake and its head perfectly dislocates from its body?

                    • Joshua Lance
                      Joshua Lance  3 days back

                      Wow!! Thanks for all this research! It's so interesting

                      • Nova
                        Nova  4 days back

                        But will it shut my kid up?

                        • Gabriel Haas
                          Gabriel Haas  4 days back

                          Look out kids of 2050 this will be on the test

                          • Inhales
                            Inhales  4 days back

                            Short answer: physics.

                            • Mohammad Rafid
                              Mohammad Rafid  4 days back

                              Im to dumb to understand this

                              • Chris Westley
                                Chris Westley  6 days back

                                9:21 to break the speed of spound

                                • StarCap
                                  StarCap  1 weeks back

                                  The arrow showing speed was pointed down for a bit, so maybe DOWN FORCE made the upper section being shown go down but also faster in that direction. That is just the wave before braking the sound barrier showing that it is gaining speed using the down force from the other parts of the whip other than the part being shown. This is probably how it is like that.

                                  • Ohr Shmuel
                                    Ohr Shmuel  1 weeks back

                                    *black people have left the chat*

                                    • Big J’s BBQ
                                      Big J’s BBQ  1 weeks back

                                      6:32 sonic boom visible.

                                      • 506 independent VIDEO
                                        506 independent VIDEO  1 weeks back

                                        cant you investigate paper bangers? I really want to know what makes the sound, or i will call you dustbin from now on

                                        • Sora & Shiro
                                          Sora & Shiro  2 weeks back

                                          *asian mom want to know your location

                                          • Aaerk Xaiedrschtaufenbach Aaerkhaezxahaenlock-e

                                            The best dom to ever exist 😂💀

                                            • Qian Pan
                                              Qian Pan  2 weeks back

                                              2:43 i guess you could say that you're getting "smarter evergy day" Buf dum pshh

                                              • Lynel Charfauros
                                                Lynel Charfauros  2 weeks back

                                                Just coming back to this to see if there was major progress on getting the new paper published?

                                                • Oliver 66
                                                  Oliver 66  2 weeks back

                                                  Sick whips

                                                  • Zalamedas
                                                    Zalamedas  2 weeks back

                                                    Where are the results of further research on this?

                                                    • Aaron Benjamin
                                                      Aaron Benjamin  2 weeks back

                                                      no wonder this tore ppl skin open god dam. i always wondered why it split skin

                                                      • Victor Engel
                                                        Victor Engel  2 weeks back

                                                        I posted this video to my Facebook page, and the first reaction I got was about the earmuffs. Do you have any data on how loud those pops are? How much energy gets transferred to your eardrums?

                                                        • Kotmos
                                                          Kotmos  2 weeks back

                                                          Что это за транс?

                                                          • katkom
                                                            katkom  2 weeks back

                                                            Is that a Caitlyn Jenner?

                                                            • kuntul burung
                                                              kuntul burung  2 weeks back


                                                              You missed the "sound" on the sound barrier....

                                                              I want to know HOW the wip was able to generate that "whiped" sound
                                                              (Answering "coz the wip was moving faster then sound is not an answer at all")

                                                              So what is sound...?

                                                              And ofcourse the question of WHY......

                                                              • Johnny_Applejuice
                                                                Johnny_Applejuice  3 weeks back

                                                                Man, they use to beat people wit those 😱

                                                                • Ruth Less389
                                                                  Ruth Less389  3 weeks back

                                                                  9:15 this the face of when someone got rejected from the job

                                                                  • Rahul Hossain
                                                                    Rahul Hossain  3 weeks back

                                                                    a woman who's good with whips ( ͡° ͜ʖ ͡°)

                                                                    • Thulium
                                                                      Thulium  3 weeks back

                                                                      Watch me whip

                                                                      Watch me *Break The Sound Barrier*

                                                                      • Auron Chung
                                                                        Auron Chung  3 weeks back

                                                                        Dr. Hazeli: Mechanics
                                                                        Dr. Kanistras: Aerodynamics
                                                                        Dr. Kang: Aerodynamics/ATOM Lab
                                                                        Parents: Belt Master

                                                                        • ELIZABETH Santiago
                                                                          ELIZABETH Santiago  3 weeks back

                                                                          I think that the tip of the whip is moving quickly
                                                                          And clearing out a space of air and air fills up that area therefore pushing the tip
                                                                          (I already watched 1/4 of the video)

                                                                          • doc crowley
                                                                            doc crowley  3 weeks back

                                                                            the shockwave isnt being pulled its being pushed ahead like ripples in water

                                                                            • Tom Holland
                                                                              Tom Holland  3 weeks back

                                                                              Could you do an infrared schlieren to track the tip?

                                                                              • rishab basera
                                                                                rishab basera  3 weeks back

                                                                                time travel !

                                                                                • Lol Player
                                                                                  Lol Player  3 weeks back

                                                                                  Smartereveryday: 3:55

                                                                                  • MindAiming
                                                                                    MindAiming  3 weeks back

                                                                                    This thing is a trap

                                                                                    • •Akuma•
                                                                                      •Akuma•  4 weeks back

                                                                                      When my Asian mom punishes me with her belt

                                                                                      • Flo Chiaruzzi
                                                                                        Flo Chiaruzzi  4 weeks back

                                                                                        Am i the only one who saw right in the first seconds that this Girl... isnt... you.. know... what i want to say if you get it

                                                                                        • Herr_Johan
                                                                                          Herr_Johan  4 weeks back

                                                                                          anyone else who found it hella unsatifying when the crack was of camera?

                                                                                          • retry
                                                                                            retry  4 weeks back

                                                                                            I've seen April on russian TV. She's everywhere

                                                                                            • retry
                                                                                              retry  4 weeks back

                                                                                              @Warm Water even sicker when Soviet russia could influence US elections and In soviet russia peoples can't influence russian's elections.

                                                                                            • Warm Water
                                                                                              Warm Water  4 weeks back

                                                                                              In Soviet Russia you don’t watch tv tv watch you

                                                                                          • Cherub's Gaming
                                                                                            Cherub's Gaming  4 weeks back

                                                                                            So I am not an engineer in anyway whatsoever, however there is a part where you said it looks like it is being pulled by the shockwave. Is it a possibility that it could be just like the subsonic bullet where the tip is technically subsonic, whereas the air near it has to move at a supersonic speed to get out of the way of the whip?

                                                                                            • Richard Dean
                                                                                              Richard Dean  4 weeks back

                                                                                              Top job 😀😀👍👍