Motion of System of Particles and Rigid Bodies — Class 11 Physics (Samacheer Kalvi)
TN State Board (Samacheer Kalvi) Class 11 Physics, Chapter 5. Centre of mass, torque, angular momentum and rolling.
1. About this chapter
This chapter covers Motion of System of Particles and Rigid Bodies as part of the Class 11 Samacheer Kalvi Physics curriculum. It deals with centre of mass, torque, angular momentum and rolling and builds conceptual understanding essential for the TN HSC Public Exam.
By the end of this chapter, students will be able to:
- Find centre of mass of systems of particles
- Apply torque and angular momentum
- Describe rolling without slipping
2. Key concepts
- Concept 1: Find centre of mass of systems of particles.
- Concept 2: Apply torque and angular momentum.
- Concept 3: Describe rolling without slipping.
3. Important terms and formulas
| Term / Formula | Description |
|---|---|
| Find centre of mass… | Find centre of mass of systems of particles |
| Apply torque and angular… | Apply torque and angular momentum |
| Describe rolling without slipping… | Describe rolling without slipping |
4. Worked examples
Example 1. Applying a key concept from this chapter.
Solution: Identify the relevant principle → apply the formula or rule → state the answer with correct units.
Example 2. A typical exam-style question on motion of system of particles and rigid bodies.
Solution: Break the problem into steps, use the appropriate formula and verify the answer.
5. Common mistakes
- Mistake: Skipping units or forgetting to state them. Fix: Always write units alongside every quantity and answer.
- Mistake: Confusing similar terms or concepts in this chapter. Fix: Make a comparison table of the terms during revision.
6. Practice (exam-style)
- Define the main term or principle covered in Chapter 5.
- Give two real-life examples related to motion of system of particles and rigid bodies.
- Solve a short numerical or descriptive question from this chapter.
- State one important formula and explain each symbol.
7. Answer key (hints)
- Refer to section 2 (Key concepts) above for the definition.
- Examples should be drawn from daily experience and local context.
- Apply the formula from section 3, show all steps clearly.
- Formula with units — refer to the textbook glossary for symbol meanings.
8. Quick revision
- Class 11 Physics — Chapter 5: Motion of System of Particles and Rigid Bodies.
- Core idea: Centre of mass, torque, angular momentum and rolling.
- Key outcomes: Find centre of mass of systems of particles; Apply torque and angular momentum; Describe rolling without slipping.
- Always revise diagrams / tables from the Samacheer Kalvi textbook before the exam.
