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
Did Building 7 Really Fall at Free Fall? I Measured the Footage
Saturday, September 26
2:00 PM PDT / 5:00 PM EDT / 9:00 PM UTC
Building 7 is one of the most repeated physics claims surrounding 9/11:
“It fell at free fall.”
Okay.
Let's measure it.
I’ve been upgrading my Video Physics Analyzer specifically for this experiment. We’ll calibrate the footage, track the roofline frame by frame, fit its position vs. time, calculate the acceleration, and compare it with g.
This turned out to be a much more interesting measurement than I expected...
6 days ago | [YT] | 1
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Dr John
Tonight, I’ll be appearing live on @ModernDayDebate to face off against @IronHorse1722 over the big question: Was the Moon landing a hoax?
I’ll be defending the evidence that the Apollo Moon landings were real. The debate begins at 9:00 p.m. ET / 6:00 p.m. PT.
Watch live here:
youtube.com/live/oUEekGiI07o
Come join us in the chat. It should be a fun one. Hope to see you there!
3 weeks ago | [YT] | 1
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Dr John
The Moon exposed something during Thursday night's eclipse. 🌘
I recorded about 20 minutes of the partial lunar eclipse. It was cloudy, a little rainy, and not the best lens. But despite this, the footage is packed with hidden information.
We’re going to reverse-engineer the eclipse footage to figure out how big the Earth is, and how far away it is from the moon.
All from one short video.
We're doing the measurements FIRST and checking the accepted values afterward.
🚫 Don't look them up.
Tomorrow: I Used a Lunar Eclipse to Measure the Earth | Physics LIVE ⚛️
1 month ago | [YT] | 1
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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. ⚛️
1 month 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?
1 month 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.
1 month 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.
2 months 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.
2 months 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.
2 months 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.
5 months ago | [YT] | 2
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