Real Physics, Zero Naps
Every swing runs on genuine equations of motion. No mystery formulas, no hand-waving — just honest, testable physics.
Lecture 3 — Interactive Physics
Physics class just got its swing back.
Push a real simulated pendulum, tweak every variable, and watch the equations happen live. No naps — just motion.
Tap the bob to push it — pushes: 0
Why you'll stay awake
Physics that pushes back
Everything in Lecture 3 is built around one idea: you learn motion by making it.
Tweak Every Variable
Change length, mass, gravity, and damping on the fly, then watch the period respond the instant you let go.
Level Up Your Lectures
Collect experiment badges, beat your own best timing, and turn each oscillation into a small, satisfying victory.
The lesson plan
Three steps to master the swing
play_circle
Pick your pendulum
Choose a bob, a string length, and even the planet whose gravity you want to play on.
tune
Run the experiments
Push, time, and record every swing while the live readout does the math for you in real time.
school
Ace the lecture
Export your data, nail the quiz, and walk out knowing T = 2π√(L/g) by heart.
Word from the classroom
Students are leaning in
"I pushed the bob once and stayed for forty minutes. My lab report basically wrote itself."
"The only lecture where students argue over who gets to push next. I call that a win."
"I finally understand why the small-angle approximation is a big deal. It clicked mid-swing."
Pick your seat
Pricing with no surprises
Start free forever. Upgrade only when you want every planet and preset.
Student
$0 /mo
- check3 pendulum rigs
- checkLive period readout
- checkCommunity chalk notes
Lab Pass
$4 /mo
- checkAll rigs & gravity presets
- checkBadge challenges
- checkLesson data exports
- checkPriority chalk support
Classroom
$12 /mo
- check30 student seats
- checkTeacher dashboard
- checkCurriculum lesson packs
Raise your hand
Frequently asked questions
What exactly is Lecture 3 — on Pendulums?expand_more
An interactive lesson where you learn pendulum motion by playing with a real simulated pendulum — pushing it, tweaking it, and measuring it yourself instead of just watching slides.
Who is it for?expand_more
Curious students from grade 9 through first-year university, plus teachers who want a class that leans in. The experiments map to standard units on SHM, period, frequency, and energy conservation.
Does it work on my device?expand_more
Any modern browser — laptop, tablet, or phone. The pendulum swings on all of them, and nothing needs installing.
Is the free tier really free?expand_more
Forever. The Student tier is our open classroom — upgrade only when you want every rig, planet, and preset.
Can I cancel anytime?expand_more
One click, no guilt trip. You keep full access until the end of the billing period you already paid for.
Homework: have fun
Ready to take physics for a swing?
Lecture 3 starts the moment you push the bob. Grab the syllabus and join the class.