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Centre of Mass

ICSE · Class 11 · Physics

Quick revision notes for Centre of Mass — ICSE Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.

44 questions30 flashcards5 concepts

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Key Topics to Revise

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1. Idea of Centre of Mass

  • The centre of mass is the point whose motion characterises the motion of the whole system.
  • A system under external force moves as if its entire mass were concentrated at the centre of mass.
  • The same external force can be imagined to act at the centre of mass.
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2. Centre of Mass of Two Particles

  • For two particles, the centre of mass lies on the line joining them.
  • It lies between the two particles.
  • If the masses are equal, the centre of mass is the average of their position vectors.
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3. Centre of Mass of n Particles and Continuous Bodies

  • For n particles, the centre of mass is the mass-weighted average of all position vectors.
  • The component form can be used in x, y, and z directions separately.
  • For a continuous body, sums are replaced by integrals over mass elements.
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4. Centre of Mass of a Uniform Rod

  • For a uniform rod, mass per unit length is constant.
  • The centre of mass of a uniform rod lies at its midpoint.
  • If one end of the rod is at the origin and the rod lies along the x-axis, the centre of mass is at x = l / 2.

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Full Notes

Key Concepts

The centre of mass isFor two particles of masses m1For n particlesFor a continuous bodyA uniform rod has mass evenly

Frequently Asked Questions

What are the important topics in Centre of Mass for ICSE Class 11 Physics?
Key topics in Centre of Mass include Centre of Mass — Complete Chapter Overview, Centre of Mass - Complete Concept Hierarchy, Centre of Mass – Complete Chapter Mind Map. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Centre of Mass — ICSE Class 11 Physics?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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