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physics notes system of particles and rotation
Study centre of mass, torque, angular momentum and rigid body rotation.
Introduction to System of Particles
This chapter connects particle mechanics with extended bodies. Instead of tracking every particle separately, we use centre of mass, momentum, torque and angular momentum to describe the whole system.
System Thinking
Many particles can be treated as one system when external forces and torques are identified carefully.
Rigid Body Idea
A rigid body keeps fixed separation between particles, so rotation has a clear angular description.
Exam Role
Rotation combines vectors, graphs, energy, momentum and calculus-style reasoning in one chapter.
Centre of Mass Overview
Centre of mass is the balancing point of a system. Its motion depends on external force, even if particles inside the system interact strongly with each other.
Linear Momentum Overview
Linear momentum helps solve recoil, explosions, collisions and rocket motion. If external impulse is zero, total momentum of the system remains conserved.
Angular Motion Overview
Angular displacement, angular velocity and angular acceleration describe rotation in the same way displacement, velocity and acceleration describe straight-line motion.
Torque Overview
Torque measures the turning effect of a force. It depends on force, lever arm and angle, and it is the rotational analogue of force in translational dynamics.
Rotational Dynamics Overview
Rotational dynamics uses torque, moment of inertia, angular acceleration, rotational kinetic energy and rolling constraints to solve rigid body problems.
Complete Chapter Roadmap
Open any roadmap card in a new tab and study the chapter in a clean order.
Centre of Mass
Study centre of mass of particles, rods, rings, discs and motion of COM.
Linear Momentum and Conservation Laws
Learn linear momentum, impulse, conservation laws, recoil and rocket motion.
Angular Displacement and Rotational Kinematics
Master angular displacement, angular velocity and rotational equations.
Torque and Angular Momentum
Understand torque, couple, angular momentum and conservation principles.
Moment of Inertia
Study moment of inertia, radius of gyration and axis theorems.
Rotational Dynamics and Rolling Motion
Learn rotational energy, rolling without slipping and rolling applications.
System of Particles and Rotation Formula Sheet and PYQs
Complete revision page with formulas, NCERT questions and PYQs.
Why Rotational Motion Is Important
System of Particles and Rotational Motion is one of the most important Class 11 mechanics chapters. Centre of mass, torque, angular momentum, moment of inertia and rolling motion are frequently used in NEET, JEE Main, JEE Advanced, CBSE and international Physics examinations.
Best Study Order
Start with centre of mass, then momentum, angular kinematics, torque, angular momentum, moment of inertia and finally rolling motion.
Still Confused in Rotation?
If centre of mass, torque, angular momentum, moment of inertia or rolling motion is not clear, contact Kumar Sir for one-to-one online Physics classes.
Phone: +91-9958461445 | Email: kumarsirphysics@gmail.com | Website: https://kumarphysicsclasses.com