Testing If You Can Blow Your Own Sail

Thanks to these folks for providing some of the music in the video:
Ponder - @Pondermusic
Laura Shigihara - @supershigi

[niicount]

As someone graduated in physics, I have never seen such a clear explanation of what the coriolis effect actually is. Amazing.

[jjthejetplane]

The leafblower bit actually could work with a specifically designed "sail". If the sail is efficient enough at redirecting the air from moving forwards to moving backwards, then it's essentially equivalent to the fan blowing into a U-shaped pipe, which would expel the air backwards, moving the vehicle forwards. Or, simplifying by removing the pipe altogether, just a fan blowing backwards.

[andrepereira]

Regarding the backpack: when you study vibrations in engineering, you learn that there's a specific frequency in which you can vibrate a spring-mass system where it will not transfer that movement to the mass. That's why there's a "sweet spot", and all the people in the commercials were running with that sweet spot frequency, where the backpack barely moved even while they were running (i.e. the movement of the person was barely transfered to the backpack). This depends on the spring constant of the springs used, and on the mass of the system (the backpack and whatever's inside it). So if Mark were to put more weight in the backpack, he'd have to find a different running frequency in order to get the same effect.

Thanks for sharing all these cool experiments and knowledge with us, Mark! You're awesome!

[DustyTurte]

I love it when you wirelessly transfer juicy knowledge to me through a screen that i'm watching. Also my niece and I love crunch labs boxes.

[Lukecarey-sdik]

I wish CrunchLabs were around when I was young! Massive respect for doing what your doing Mark!

[mikiqex]

That backpack reminded me, if you walk with your drink, the equal frequency of your steps is building up waves in the mug, so ultimately you spill it. I do my "silly walk" with unevenly distributed steps and it truly helps make my way without spillage. With that walk I basically create waves that go against the waves I already created in the mug, mimicking how active noise cancelling works in ANC headphones.

[乂]

If only school were as entertaining as Mark's videos...

[prof.arcaninesnape]

This has got to be my favourite Mark Rober video ever. such simple explanations on complex subjects.

[bernatzmark]

Thank you Mark! Teaching kids a love of discovery is the most amazing thing in the world!
-high school math teacher.

[KalijahAnderson]

"Does it work when I pour the water?"
LMAO. That guy's reaction was priceless and translated perfectly into 'Ah, crap, you noticed what I was doing.'

[OfentseMwaseFilms]

1st time learning the difference between a Cyclone and a Hurricane. I thought one is air, the other is water based.

[samuelolugbemi]

Love the way you make sure your contents are educative and fun.

Love you mark . Great work

[seiichiii]

Mr. Mark, you could definitely become a physics teacher.
You can explain everything a lot simpler than my current professor.

[tbluge]

Mark is such a treasure for humanity. Imagine how many kids are getting interested in science because of this gem of a human. What a role model!

[seanbrockest]

0:48 "Not just what, but why" is the mantra of every good educator! Thank You Mark!

[PatricHua]

17 minutes of my life well spent. This is content worthy to be on Youtube, not social media type BS that poisons our mind.

[TuanTaiPham-hjex]

When I watch Mark's video, I discover more about science.!!. Love your videos, Mark!!

[G_Blze]

Bro Mark Rober is the GOAT of science because of how simple he makes science so that everyone can understand.
Thank you Mark Rober!

[Mift_]

What's more exciting is when people explain science in a practical way without causing headaches, greetings from Indonesia ❤

[zacwarn]

I could never fully understand the balloon density illusion till now. The visual effects and explanations are wonderful