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NCERT Class 11 Physics Chapter 6: System of Particles and Rotational Motion PDF Download

System of Particles and Rotational Motion is Chapter 6 of the Class 11 Physics NCERT textbook. This chapter takes things a step forward by introducing motion not just in a straight line, but around an axis. It explains how systems of multiple particles move together, how to calculate centre of mass, and what happens when

NCERT Class 11 Physics Chapter 6: System of Particles and Rotational Motion

System of Particles and Rotational Motion is Chapter 6 of the Class 11 Physics NCERT textbook. This chapter takes things a step forward by introducing motion not just in a straight line, but around an axis. It explains how systems of multiple particles move together, how to calculate centre of mass, and what happens when rigid bodies rotate. Concepts like torque, angular momentum, and the famous Newton’s laws in rotational form are introduced in this chapter.

I decided to write about this chapter because many students find it difficult at first, but once understood, it becomes one of the most scoring topics in Physics. This chapter has strong connections to real life — from wheels rotating to athletes spinning in sports. Also, questions from this topic are regularly asked in JEE, NEET and board exams. Understanding this chapter properly helps in tackling chapters like Gravitation and Oscillations later. Since the NCERT book is the best place to start, having access to the full PDF along with a clear explanation of the content makes it easier to revise and practice.

NCERT Class 11 Physics Chapter 6: System of Particles and Rotational Motion – Overview

This chapter begins by dealing with systems of particles and then moves into the concepts of rotational motion in rigid bodies. It combines the ideas of mass, motion, forces and rotation, giving a solid base for further Physics study.

Key Topics Covered

1. Centre of Mass

  • What is centre of mass
  • Motion of centre of mass
  • Centre of mass of two/more particles
  • Centre of mass of rigid bodies

2. Linear Momentum and Angular Momentum

  • Conservation of linear momentum
  • Torque and angular momentum
  • Angular momentum in vector form
  • Conservation laws

3. Moment of Inertia

  • Definition and significance
  • Radius of gyration
  • Theorems of perpendicular and parallel axes
  • Calculation of moment of inertia for simple objects (rod, disc, ring, sphere)

4. Rotational Dynamics

  • Torque as the rotational equivalent of force
  • Newton’s second law for rotation
  • Rolling motion
  • Relationship between angular and linear quantities

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Click here to download NCERT Class 11 Physics Chapter 6: System of Particles and Rotational Motion PDF

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NCERT Class 12 Geography (Fundamental of Human Geography) Chapter 8: International Trade – Free PDF Download and Full Chapter Summary

Chapter 8 of the NCERT Class 12 Geography (Fundamentals of Human Geography) book focuses on International Trade, which is one of the most crucial aspects of a country’s economic and political relations. This chapter explains how countries exchange goods and services across borders, the patterns of trade, the role of organisations like WTO, and India’s

NCERT Class 12 Geography (Fundamental of Human Geography) Chapter 8: International Trade

Chapter 8 of the NCERT Class 12 Geography (Fundamentals of Human Geography) book focuses on International Trade, which is one of the most crucial aspects of a country’s economic and political relations. This chapter explains how countries exchange goods and services across borders, the patterns of trade, the role of organisations like WTO, and India’s position in the global trade network. It also talks about different trade routes, major exports and imports, and recent changes in global trade systems.

I chose to write about this chapter because it helps students understand not just bookish definitions but also how the world’s economies are connected. In today’s time, when prices of onions in India are affected by export bans or crude oil rates are driven by international conflicts, this chapter becomes very relatable. I strongly believe students should learn how international decisions impact their own country’s economy. Whether someone is preparing for board exams or competitive ones like UPSC, understanding the basics of trade is a must. That’s why I’ve included a PDF download link also, so students can directly study from the source material.

What is International Trade?

International trade refers to the exchange of goods and services between countries. It helps nations earn foreign exchange, create jobs, and promote economic growth.

There are two main types:

  • Bilateral Trade: Between two countries (e.g., India and Bangladesh)
  • Multilateral Trade: Involves many countries (e.g., through WTO)

This chapter also discusses the difference between free trade and protectionism. While free trade supports open markets, protectionism involves tariffs and restrictions to protect domestic industries.

Importance of International Trade

  • Helps countries get access to goods they cannot produce locally
  • Promotes cooperation among nations
  • Brings in foreign exchange
  • Boosts industrial and agricultural sectors

Major Trade Routes and Patterns

Trade routes are the paths through which goods travel across the globe. These can be land, sea or air routes.

Major Sea Routes

  • North Atlantic Route (between North America and Europe)
  • Suez Canal Route (connecting Europe to Asia)
  • Cape of Good Hope Route (used when Suez Canal is blocked)

Factors Affecting Trade Routes

  • Physical barriers like mountains and deserts
  • Political relations between countries
  • Development of transport and communication

India’s Role in Global Trade

India plays a growing role in world trade, especially in services and IT. The chapter highlights:

  • India exports textiles, gems and jewellery, software, petroleum products
  • Imports include crude oil, gold, machinery, electronics
  • India’s trade partners: USA, China, UAE, Saudi Arabia, and European countries

The chapter also explains government initiatives like:

  • Make in India
  • Foreign Trade Policy
  • Special Economic Zones (SEZs)

These are designed to increase India’s share in international trade.

Role of International Organisations

The World Trade Organization (WTO) is an important part of the chapter. It regulates international trade laws and resolves trade disputes. The chapter explains the pros and cons of WTO’s role in developing nations like India.

Download PDF: NCERT Class 12 Geography Chapter 8 – International Trade

If you are looking for the official NCERT PDF of this chapter, you can download it from the link below:

NCERT Class 12 Geography (Fundamental of Human Geography) Chapter 8: International Trade

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