Hi! My name is Dr. John, and I have a Ph.D. in physics (so no medical advice on this channel!). The major take-a-way I'd like to share is that physics is literally all around us... and it's messy. My goal is to show why this is true, and demonstrate how physics can be used to understand the basic principles behind nearly everything. Whether it’s the physics behind atomic weapons or ancient Egyptian technologies, no topic is off limits. My target audience consists of students, teachers, life-learners, and those curious about the science governing the world around them.
If this sounds like your cup of tea, subscribe to my channel & share with your friends and family :)
Thank you for watching my videos, and I look forward to exploring these topics together!
For business or press inquiries, please contact me directly at:
john@drjohn.dev.
Dr John
There's more to this Black Hawk helicopter footage than meets the eye.
The helicopter’s rotor appears to slow down, freeze, and even rotate backward on camera.
Obviously, it isn’t, but most people stop here and move on.
But here’s the weird part: that camera illusion actually gives us enough information to figure out exactly how fast the Black Hawk's rotor IS spinning.
For the next Physics LIVE, I’m taking publicly released U.S. military footage, using a home-built computer-vision analysis tool that exploits the repeating rotor pattern, and uses that information to figure out the Black Hawk's rotor RPMs.
We’re doing it blind!
🚫 DON’T LOOK UP THE BLACK HAWK ROTOR SPEED!
Drop your prediction below:
How many RPM do you think those enormous blades are actually turning?
During the stream we’ll make our measurement first—and only then compare it against Sikorsky’s published specification.
And if the measurement works, we’ll use it to calculate something even crazier about the blade tips.
HIDDEN IN THE FRAMES.
See you LIVE. ⚛️
6 days ago | [YT] | 1
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Dr John
Can a fall lasting under a second and a half reveal the mass of the entire Moon?
Apollo 15’s hammer-and-feather drop is usually used to show that objects fall together when atmospheric drag is removed.
But we can turn this up a notch. For the realists, this is a pretty cool video trick for figuring out some lunar gravity. But for those that don't believe in gravity (let alone the moon landing), this might be a pretty loaded topic. Approach with caution.
Regardless, should be fun.
Tap Notify Me on the stream below.
Before we begin: how close do you think 1971 television footage can get to the accepted value—within 5%, 10%, 25%, or not even close?
2 weeks ago | [YT] | 3
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Dr John
Can an iPhone measure a volcano from thousands of feet away... and do it better than USGS?
In this live lesson, we’ll do the measurement together using real footage from the most recent Kīlauea eruption on July 28—and figure out why this simple way to measure distances from afar works.
Just need an active volcano, and you'll be all set ;p
Tap Notify Me below.
3 weeks ago | [YT] | 2
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Dr John
Today on Dr. John’s Intro Physics:
Vector Addition and Subtraction Explained with Airplanes
Monday, July 20, 2026
2:00 PM PDT / 5:00 PM EDT / 9:00 PM UTC
After last weekend’s Flat vs. Globe debate on @ModernDayDebate, I was inspired to dedicate a stream to figuring out vectors using airplanes. Pilots rely on vectors constantly. And based on Iron Horse’s rebuttals… seems like a few people could use a refresher.
So today, we’ll talk about vector addition, vector subtraction, components, resultants, and how physicists use vectors to describe motion in more than one direction.
Then we’ll apply the same ideas to airplanes: headwinds, tailwinds, crosswinds, air speed, ground speed, and why pilots sometimes have to point the plane in one direction while the plane actually moves in another.
Live Discord participation is open again. If you want to contribute during the show, join the Discord and hop into the “Public Forum” voice channel: discord.gg/Me5burD5G7
Bring questions, claims, and a big bag of arrows.
1 month ago | [YT] | 1
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Dr John
Tomorrow on Dr. John’s Intro Physics:
Speed vs Velocity vs Acceleration
Friday, July 17, 2026
2:00 PM PDT / 5:00 PM EDT / 9:00 PM UTC
On the previous stream, chat received several confident reports that gravity does not exist and rockets are fake.
Bold claims.
So this lecture, we’re doing 1D kinematics: position, displacement, speed, velocity, acceleration, falling objects, and rocket motion after launch.
We’ll look at how physicists quantify motion, why speed and velocity are not the same thing, what acceleration actually means, and how the basic kinematic equations let us predict where something will be and how fast it will be moving.
Live Discord participation is open again. If you want to contribute during the show, join the Discord and hop into the “Public Forum” voice channel:
discord.gg/Me5burD5G7
Bring questions. Bring claims. Bring receipts.
PPE optional. Evidence required.
1 month ago | [YT] | 1
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Dr John
I’m starting a new live lecture series: Dr. John’s Intro Physics.
Whether you're a resourceful college student or a confused flat earther, there should be something for everyone.
New channel feature: live Discord participation. If you’re watching live and want to contribute to the show, join the Discord and hop into the “Public Forum” voice channel during the stream:
discord.gg/Me5burD5G7
First stream: Tomorrow, July 15, 2026 at 2:00 PM PDT / 5:00 PM EDT / 9:00 PM UTC.
Topic:
What Is Physics Really? Units, Measurement & Models
We’ll start with the big picture questions: what physics is, what it’s used for, how we quantify the world, why units matter, and why models are central to understanding reality.
This is the beginning of an algebra-based intro physics sequence for students, independent learners, curious people, and yes, even the occasionally confused.
Bring questions. Join the discussion. PPE optional. Evidence required.
1 month ago | [YT] | 2
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Dr John
Live today on Modern-Day Debate (@ModernDayDebate):
Flat vs. Globe | me vs. Flat Earth Aussie (@IronHorse1722)
6:00 PM PDT / 9:00 PM EDT
Tune in. I’m aiming to send that beard into retirement.
4 months ago | [YT] | 2
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Dr John
Had some technical issues with the stream, but it's LIVE now. New location here:
youtube.com/live/k-QASrI-mLk?feature=share
1 year ago | [YT] | 2
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Dr John
The events here are rather odd. The US district court case against the EPA on water fluoridation took nearly 8 years to reach a final verdict. This wasn't an accident. While this case barely made a blip on the headline news, it kept public health agencies up at night. The details here, did the same for me.
Find out everything about the public health agency emails, court tapes, and documents surrounding this case during my new LIVE stream tomorrow!
youtube.com/live/mTfE4odCKek?feature=share
Friday 2/21
2PM PT (5PM ET)
1 year ago | [YT] | 2
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Dr John
New study on fluoride exposure and IQ may require current public health policies to re-evaluate the practice of adding fluoride to the water supply. Has water fluoridation finally met its match?
See what it all means during my new LIVE stream tomorrow!
youtube.com/live/2_Kt5Xmbduk?feature=share
Saturday 2/1
1PM PT (4PM ET)
1 year ago | [YT] | 2
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