Physics & How Things Work
25 interactive videos. Watch each one, then try the idea live. Free, no account.
How a Toilet Flushes
It's not a drain. It's a hidden siphon that you trigger on purpose, every time.
Why Things Fall
A bowling ball and a feather fall at the same speed — in a vacuum. Yes, really.
How a Microwave Cooks
It doesn't heat the plate. It makes the WATER inside food dance — 2.4 billion times a second.
How a Zipper Zips
A tiny brass Y inside the slider forces teeth into each other at exactly the right angle. Geometry, not magic.
How a Fridge Stays Cold
A fridge can't MAKE cold. It pumps heat OUT — and the back is warm because of it.
How an Elevator Goes Up
It's a balanced scale. The counterweight does the heavy lifting — the motor just tips it.
Why Ice Is Slippery
Every surface is bumpy under a microscope. Bumps catching bumps = friction.
Why the Sky Is Blue
Sunlight is every color. Air bounces BLUE more than the rest. That's the trick.
How Your Eyes See
Your eye is a biological camera. Lens, sensor, processor — and the image arrives upside down.
What Is Sound?
Sound is just air, getting pushed around. No air, no sound. Higher push-rate = higher note.
How a Car Stops
Brakes don't slow you down — they bleed your motion off as HEAT.
How an Airplane Flies
Wings cheat gravity by stealing the air pressure above them.
How a Camera Captures Light
A lens + a grid of tiny light meters + a million numbers = a photo.
How a Lock Opens
A pin tumbler lock isn't magic — it's a height puzzle with five springs.
Why Mirrors Flip You
Light bounces with angle-in = angle-out. The flip is depth, not direction.
Echo & Bounce
An echo is just sound that bounced off a wall and came back late.
Electricity Flows Like Water
Voltage pushes. Current flows. Resistance squeezes. Same math as a water pipe.
Why Magnets Pull
Inside iron, atoms can line up. Aligned atoms = a magnet you can feel.
Every Push Pushes Back
Newton's 3rd law. The wall pushes you exactly as hard as you push it.
Why Trucks Are Scary
Mass × velocity = momentum. The big rule that decides every collision.
How Springs Bounce
Squeeze stores energy. Release lets it out. That's a trampoline.
How Lenses Magnify
Curved glass bends light to a point. Look through it and small things get big.
Why Notes Sound Different
Thin, short, tight = fast vibration = high note. Same rule. Everywhere.
How Circuits Light Up
Electricity is shy — it only flows in a complete loop. Break the loop, nothing works.
Why You Get Zapped
Walking on carpet collects electrons on you. Touching metal lets them leap.