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JEE Physics System of Particles and Rotational Motion is one of the most important and conceptually advanced chapters in Class 11 Mechanics. This chapter extends the laws of motion from single particles to systems of particles and rigid bodies, introducing rotational dynamics and angular quantities.
In JEE Main and Advanced, this chapter carries high weightage and often includes multi-step numerical problems that test a student’s understanding of centre of mass, torque, angular momentum, and rotational equations of motion.
Studentbro.in’s System of Particles and Rotational Motion content is carefully structured to help students build strong fundamentals, mathematical clarity, and problem-solving confidence.
Direct Links to Download 2025-26 JEE Physics Notes (PDF)
► Click “Download Here” next to your access the free PDF.
♦ System of Particles And Rotational Motion ⇒ Download Here
♦ Maths in Physics ⇒ Download Here
♦ Units And Measurements ⇒ Download Here
♦ Motion In A Straight Line ⇒ Download Here
♦ Motion In A Plane ⇒ Download Here
♦ Laws Of Motion ⇒ Download Here
♦ Friction ⇒ Download Here
♦ Work, Energy And Power ⇒ Download Here
♦ Gravitation ⇒ Download Here
♦ Kinetic Theory ⇒ Download Here
♦ Thermal Properties Of Matter ⇒ Download Here
♦ Thermodynamics ⇒ Download Here
♦ Transmission of Heat ⇒ Download Here
♦ Oscillations ⇒ Download Here
♦ Waves ⇒ Download Here
♦ Current Electricity ⇒ Download Here
♦ Electrostatic Potential And Capacitance ⇒ Download Here
♦ EMI & AC ⇒ Download Here
♦ Mechanical Properties of Fluids ⇒ Download Here
♦ Moving Charges And Magnetism ⇒ Download Here
♦ Dual Nature of Radiation And Matter ⇒ Download Here
♦ Wave Optics ⇒ Download Here
♦ Physics Formula PDF for Entrance Exam ⇒ Download Here
This chapter focuses on:
Understanding motion of a system of particles
Learning the concept of centre of mass (COM)
Analyzing rotational motion of rigid bodies
Applying torque and angular momentum concepts
Solving JEE-level rotational mechanics numericals
It forms the bridge between linear mechanics and advanced rotational dynamics.
This chapter is important because:
It is one of the highest scoring mechanics chapters
Many JEE questions are numerically intensive and conceptual
It builds the foundation for gravitation and rigid body dynamics
It enhances logical reasoning and mathematical application
It improves confidence in advanced physics problem-solving
A system of particles consists of two or more particles interacting with each other. The motion of such systems is analyzed using:
Internal and external forces
Newton’s laws applied to the system
Concept of centre of mass
This simplifies the study of complex motion.
The centre of mass is the point at which the entire mass of a system can be assumed to be concentrated.
Determines translational motion of the system
Depends on mass distribution
Simplifies analysis of multi-particle systems
COM problems are frequently asked in JEE.
The motion of the centre of mass follows Newton’s laws, regardless of internal forces.
External forces affect COM motion
Internal forces cancel out
This principle helps solve complex JEE problems efficiently.
When a rigid body rotates about an axis:
Each particle moves in a circular path
Angular quantities like angular displacement, velocity, and acceleration are used
Linear and angular quantities are related
This is the core of rotational mechanics.
Torque is the rotational equivalent of force
Determines rotational effect of forces
Angular momentum is conserved in absence of external torque
These concepts are essential for solving rotational motion problems.
Moment of inertia measures a body’s resistance to rotational motion.
Depends on mass distribution and axis of rotation
Different bodies have different moments of inertia
Parallel and perpendicular axis theorems simplify calculations
Moment of inertia problems are common in JEE Advanced.
These equations are analogous to linear motion equations and help in solving:
Constant angular acceleration problems
Combined translational and rotational motion
Understanding these equations improves numerical efficiency.
Rolling motion is a combination of translation and rotation.
Rolling without slipping
Energy distribution in rolling motion
These problems test deep conceptual understanding.
Identify type of motion (translation, rotation, or rolling)
Locate centre of mass and axis of rotation
Apply Newton’s laws or rotational equations
Use energy conservation if applicable
Solve step by step and verify results
This approach ensures accuracy in exams.
Improves understanding of rotational concepts
Strengthens mathematical handling of equations
Enhances problem-solving speed
Reduces errors in multi-step problems
Builds confidence for JEE Advanced-level questions
JEE Main & Advanced aspirants
Class 11 students studying mechanics
Students aiming to master rotational dynamics
Anyone preparing for advanced physics exams
Master centre of mass concepts
Practice moment of inertia derivations
Solve rotational motion numericals daily
Focus on previous year JEE questions
Revise formulas and theorems regularly
Fully aligned with latest JEE syllabus
Designed by experienced Physics faculty
Exam-oriented numericals and illustrations
Clear explanations for conceptual clarity
Ideal for revision and practice
JEE Physics System of Particles and Rotational Motion is a high-weightage and conceptually challenging chapter. With a strong understanding of centre of mass, torque, angular momentum, and rotational dynamics, students can confidently solve even the toughest JEE problems.
Studentbro.in’s System of Particles and Rotational Motion resources provide clear theory, structured practice, and exam-focused explanations, helping students achieve excellence in JEE Main & Advanced.
Prepare effectively with Rotational Motion by studentbro.in and build a strong foundation in advanced mechanics.
