Rotational Mechanics Problem Solving - Part - 4| Class 11, NEET, IIT JEE | Rohit Ranjan (IIT KGP)

Описание: In this video, Rohit Ranjan (B.Tech IIT Kharagpur) explains a beautiful IIT JEE 1998 Rotational Mechanics problem using the Principle of Conservation of Mechanical Energy.
We analyse a uniform disc of radius R with an attached particle of mass m fixed at its edge. The disc rotates freely about a horizontal chord PQ located at a distance R/4 from the centre. Initially, the disc is vertical with the particle at the topmost point.

⭐ Concepts Covered in This Video (Rigid Body Rotation and Principle of conservation of mechanical energy)

✔ Moment of Inertia of a disc about a chord (Parallel Axis Theorem)
✔ Moment of Inertia of the system (disc + particle)
✔ How gravitational potential energy converts into rotational kinetic energy
✔ Identifying lowest and highest positions
✔ Computing angular speed using energy conservation
✔ Finding linear speed of the particle at the lowest point
✔ JEE problem-solving technique for rotating bodies with fixed axes

This is one of the best problems to strengthen your understanding of energy conservation in rotation, parallel axis theorem, and rigid body dynamics—perfect for JEE Main/Advanced, NEET, Class 11–12 Physics.

⭐ Why Watch This Video?

Builds intuition for mixed rotational systems

Shows step-by-step energy analysis

Improves exam problem solving speed

Covers an important IIT PYQ in depth

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