This college physics with calculus video tutorial explains how to derive the formula for the inertia of a solid sphere.

Intro to Rotational Motion: https://www.youtube.com/watch?v=WQ9AH2S8B6Y
Angular Velocity: https://www.youtube.com/watch?v=d5VXZGinKSk
Angular Acceleration: https://www.youtube.com/watch?v=a99sO7pogXA
Rotational Kinematics: https://www.youtube.com/watch?v=0El-DqrCTZM
Intro to Torque: https://www.youtube.com/watch?v=jg4e8W44_E4
Intro to Inertia: https://www.youtube.com/watch?v=Ic_wFYu8xVs
Parallel Axis Theorem: https://www.youtube.com/watch?v=JrkimXqnCLw
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Rotational Dynamics: https://www.youtube.com/watch?v=dbvr-L5rxdg
Rotational Kinetic Energy: https://www.youtube.com/watch?v=REIP2mf6sIQ
Rotational Power, Work, & Energy: https://www.youtube.com/watch?v=KbYejyiRsFw
Work Done By a Constant Torque: https://www.youtube.com/watch?v=-DPthKuQGyQ
Angular Momentum & Torque: https://www.youtube.com/watch?v=WzjIMuf-yuo
What Is Angular Momentum? https://www.youtube.com/watch?v=4GgJ6EgAmFg
Angular Momentum Problems: https://www.youtube.com/watch?v=QghXDDJtJeQ
Angular Impulse: https://www.youtube.com/watch?v=RQL_0MMbxkc
Rotational Motion - Review: https://www.youtube.com/watch?v=SPSvosj6Snc
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Introduction to Momentum: https://www.youtube.com/watch?v=NIVNfI0RN2k
Impulse and Momentum: https://www.youtube.com/watch?v=hODlmGK7pl8
Conservation of Momentum: https://www.youtube.com/watch?v=Fp7D5D8Bqjc
Rocket Propulsion: https://www.youtube.com/watch?v=kvAf-Xouj8s
What Really Is a Force? https://www.youtube.com/watch?v=mril0zFVJXQ
Inelastic Collisions: https://www.youtube.com/watch?v=C1XuwHLacao
Impulse Momentum Theorem: https://www.youtube.com/watch?v=1WIECGg71WY
Force-Time Graphs: https://www.youtube.com/watch?v=Bv9ry123zck
Ballistic Pendulum Problem: https://www.youtube.com/watch?v=PUNKqLkELbQ
Elastic Collisions: https://www.youtube.com/watch?v=CFbo_nBdBco
2D Collision Problems: https://www.youtube.com/watch?v=9YRgHikdcqs
Impulse & Momentum Test Review: https://www.youtube.com/watch?v=FfaEbqmvKQA
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Physics - Basic Introduction: https://www.youtube.com/watch?v=b1t41Q3xRM8
How To Convert Units: https://www.youtube.com/watch?v=eK8gXP3pImU
Kinematics In One Dimension: https://www.youtube.com/watch?v=dHjWVlfNraM
Vectors - Basic Introduction: https://www.youtube.com/watch?v=EwSHKuSxX_8
Projectile Motion Problems: https://www.youtube.com/watch?v=tfItlGfPHyo
Free Body Diagrams: https://www.youtube.com/watch?v=52R61aSWHg0
Pulley Physics Problems: https://www.youtube.com/watch?v=N6IhkTjWrd4
Work, Energy, and Power - Review: https://www.youtube.com/watch?v=_MR1Dp8-F8w
Hooke's Law & Elastic PE: https://www.youtube.com/watch?v=OmMIOZtM1ks
Conservation of Energy: https://www.youtube.com/watch?v=_DwG8fukuj4
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SAT Math Test Prep: https://www.youtube.com/watch?v=fTGuTEQCsZY
ACT Math Test Prep: https://www.youtube.com/watch?v=SsA7rZ8kczM
GRE Math Test Prep: https://www.youtube.com/watch?v=z6lbrzaCbdk
Physics Final Exam Review: https://www.youtube.com/watch?v=CwkhvFlNFp0
Physics PDF Worksheets: https://www.video-tutor.net/physics-basic-introduction.html