Skip to main content
Super TutorResources
Chapter 19 of 30
Revision Notes

Centre of Mass — Revision Notes

ICSE · Class 11 · Physics

Centre of Mass revision notes for ICSE Class 11 Physics: 4 topics in quick points. Part of the ICSE Class 11 Physics syllabus.

44 questions30 flashcards10 formulas & key relations5 concepts

Interactive on Super Tutor

Studying Centre of Mass? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.

Try Super Tutor — Free

Free trial, no card needed.

Key Topics to Revise

1

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.
2

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.
3

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.
4

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.

Get complete notes with diagrams and examples

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 Idea of Centre of Mass, Centre of Mass of Two Particles, Centre of Mass of n Particles and Continuous Bodies, Centre of Mass of a Uniform Rod. Study these first, then practise questions on each for Class 11 exams.
How should I revise Centre of Mass for Class 11 exams?
Learn the core ideas first, then work through the 44 practice questions on Centre of Mass. Revise 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.

More resources for Centre of Mass

All ICSE Class 11 Physics Revision Notes

For serious students

Get the full Centre of Mass chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 11 Physics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free