Chapter 8 of 32
Revision Notes
Rotational Motion — Revision Notes
NEET-UG · Physics
Free Rotational Motion revision notes for NEET-UG Physics 2026 — key concepts, formulas, and definitions for quick revision.
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Key concepts, formulas, and definitions from Rotational Motion for NEET-UG Physics preparation.
Key Topics to Revise
1
Centre of Mass and Basic Concepts
- Centre of mass is the point where all mass of the system appears to be concentrated
- For a system of n particles: r⃗cm = (Σmᵢrᵢ)/(Σmᵢ)
- For uniform symmetric bodies, centre of mass coincides with geometric centre
2
Angular Displacement, Velocity and Acceleration
- Angular displacement θ = s/r, measured in radians (dimensionless quantity)
- Angular velocity ω = dθ/dt, relates to linear velocity by v = rω
- Angular acceleration α = dω/dt = d²θ/dt²
3
Rotational Kinematics Equations
- Rotational motion equations are analogous to linear motion equations
- For constant angular acceleration: ω = ω₀ + αt, θ = ω₀t + ½αt², ω² = ω₀² + 2αθ
- These equations apply only when angular acceleration is constant
4
Moment of Inertia
- Moment of inertia I = Σmᵢrᵢ² for discrete masses, I = ∫r²dm for continuous distribution
- It is the rotational analogue of mass in linear motion
- Depends on mass distribution and axis of rotation
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Key Concepts
The centre of mass isAngular displacement (θ) = s/rMoment of inertia (I) isTorque (τ⃗) = r⃗ × F⃗Angular momentum (L⃗) = r⃗ ×
Frequently Asked Questions
What topics are covered in Rotational Motion for NEET-UG?
Rotational Motion is an important chapter in NEET-UG Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Centre of Mass and Basic Concepts, Angular Displacement, Velocity and Acceleration, Rotational Kinematics Equations, Moment of Inertia.
How important is Rotational Motion for NEET-UG?
Rotational Motion is a frequently tested chapter in NEET-UG Physics. Questions from this chapter appear regularly in previous year papers. There are 83 practice questions available for this chapter.
How to prepare Rotational Motion for NEET-UG?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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