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System of Particles and Rotational Motion

CBSE · Class 11 · Physics

Quick revision notes for System of Particles and Rotational Motion — CBSE Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Types of Motion for Rigid Bodies

  • Pure translational motion: All particles have same velocity at any instant (e.g., block sliding down incline)
  • Pure rotational motion: Body rotates about fixed axis, each particle moves in circular path (e.g., ceiling fan)
  • Combined motion: Translation + Rotation (e.g., rolling cylinder)
2

Center of Mass

  • Center of mass is the weighted average position of all particles
  • For two particles: X = (m₁x₁ + m₂x₂)/(m₁ + m₂)
  • For n particles: X = Σmᵢxᵢ/M, Y = Σmᵢyᵢ/M, Z = Σmᵢzᵢ/M
3

Motion of Center of Mass

  • CM moves as if all mass concentrated at CM and all external forces act there
  • Internal forces don't affect CM motion (Newton's 3rd law)
  • Velocity of CM: V = P/M where P is total momentum
4

Linear Momentum of System

  • Total momentum P = Σpᵢ = Σmᵢvᵢ
  • P = MV (momentum equals total mass times CM velocity)
  • Conservation of momentum: If F_ext = 0, then P = constant

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Full Notes

Key Concepts

A rigid body can undergo pureThe point where the total massAngular velocity ω = dθ/dt measuresFor vectors a and bThe rotational equivalent of force

Frequently Asked Questions

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System of Particles and Rotational Motion covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in System of Particles and Rotational Motion — CBSE Class 11 Physics?
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Sources & Official References

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

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