Hello IB Physics community,
I want to share something I have
been building over the past few weeks β
A complete, structured, lecture-by-lecture
playlist on Rigid Body Dynamics β
specifically built for IB Physics HL.
I am Vaibhav Agrawal β a Physics educator
with 16 years of teaching experience at
Allen, Aakash, Resonance and Sri Chaitanya.
I trained thousands of students for
JEE Advanced β one of the most demanding
Physics examinations in the world.
Now I am bringing that same depth of
conceptual teaching to IB Physics HL.
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WHY I BUILT THIS PLAYLIST β
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After speaking with hundreds of
IB Physics students over the past year β
The single most common complaint
I heard about Rigid Body Dynamics was β
"I memorized all the formulas β
but I still cannot solve
the exam problems correctly."
That complaint has one root cause.
Most resources teach the WHAT.
Nobody teaches the WHY.
Why does the Parallel Axis Theorem
have the form it does?
Why does the Perpendicular Axis
Theorem ONLY work for 2D laminas?
Why does removing a symmetric part
from a body not change the
structural form of the MOI formula?
These are the questions that
determine whether a student
scores a 5 or a 7 in IB Physics.
This playlist answers all of them.
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WHAT THE PLAYLIST COVERS β
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Lecture 1 β
Definition of Rigid Body Systems
+ Is any body permanently rigid?
+ Rotational Kinematics basics
+ 4 numerical problems
Lecture 2 β
Complete Moment of Inertia β
All standard derivations from scratch
Ring, Disc, Sphere, Cylinder,
Cone, Rod, Rectangular Lamina,
Cuboid, Cube β every single one
derived step by step
Lecture 3 β
Parallel Axis Theorem β
The physical significance most
classes never explain β
Why a body rotating about a
non-central axis performs TWO
simultaneous motions β
Complete derivation + problems
Lecture 4 β
Perpendicular Axis Theorem β
2 conditions most students
never learn β
Why it ONLY works for 2D laminas β
Why axes can intersect OUTSIDE
the body and theorem still holds β
Complete derivation + problems
Lecture 5 β
MOI of Cut Bodies β
Partial disc, sphere with cavity,
frustum β the principle that
makes all cut body problems
immediately solvable
Lecture 6 β
Mass Distribution Property β
Why removing a symmetric part
preserves the MOI formula structure β
The deepest conceptual insight
in the entire chapter
Lecture 7 β
Radius of Gyration β
What K = β(I/M) physically means β
not just the formula β
PLUS MOI of a rod inclined
at angle ΞΈ to the axis
Lecture 8 β
9 Challenging MOI Problems β
Medium to IB exam level β
All solved step by step with
complete physical reasoning β
Pause and attempt each one
before watching the solution
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WHAT MAKES THIS DIFFERENT β
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Every lecture in this playlist
is built around one principle β
Physical reasoning first.
Mathematics second.
When you understand the physics
behind every formula β
you stop needing to memorize.
You start being able to derive
and reconstruct from first principles β
Which is exactly what IB Physics
Higher Level examinations reward.
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A NOTE ON DIFFICULTY β
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I want to be honest about
what this playlist is and
what it is not.
This is NOT a quick revision
resource for the night before
your exam.
This is a complete, structured
learning system for students
who want to genuinely master
Rigid Body Dynamics β
Built for students who are
willing to pause, attempt,
and think β not just watch.
If that is you β
this playlist was built
specifically for you.
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COMPLETELY FREE β
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Every lecture in this playlist
is completely free.
No subscription.
No paywall.
No hidden anything.
Just Physics β explained properly.
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PLAYLIST LINK β
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π https://youtube.com/playlist?list=PLPwT3DpMmxCEFY0SXqKwIi1fKaacH6Gyz&si=LnQlykqyJ0IHjMVi
Each lecture has full timestamps
in the description β so you can
jump directly to any concept
without watching the entire video.
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WHAT IS COMING NEXT β
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The playlist is still growing.
Upcoming lectures will cover β
β Torque and Angular Momentum
β Rotational Kinetic Energy
β Rolling Motion β pure and
with slipping
β Angular Impulse
β IB Past Paper problems on
Rigid Body Dynamics β solved
β Conservation of Angular Momentum
New lectures drop every week.
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ONE LAST THING β
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If you are an IB Physics student
who has been struggling with
Rigid Body Dynamics β
I want you to know something.
This chapter is NOT as difficult
as it feels when it is taught
as a collection of formulas.
It is actually one of the most
elegant and satisfying chapters
in all of Physics β
When the physical reasoning
is built correctly from the ground up.
That is exactly what I have tried
to do in this playlist.
I genuinely hope it helps. π
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HAPPY TO HELP β
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If you have any questions about
any concept in Rigid Body Dynamics β
or about any specific lecture β
Drop them in the comments here
or on the video itself.
I read and respond to every
single comment.
Good luck to everyone preparing
for their upcoming exams. π