For a rigid body, the angular velocity of any particle about a given axis of rotation is:
General Awareness ·Previously asked in SSC CGL 2025
View the full solved paper: SSC CGL 2025 Tier I — 12 Sep 2025 (Shift 1, 9:00 AM)
Question
For a rigid body, the angular velocity of any particle about a given axis of rotation is:
- A. Proportional to its distance from the axis
- B. The same for all particles (Correct answer)
- C. Inversely proportional to its distance from the axis
- D. Always zero
Correct Answer
Option B — The same for all particles
Detailed Solution & Explanation
The correct answer is The same for all particles.
Key Points
- In a rigid body every particle turns through the same angle in the same time, so the angular velocity ω is identical for all particles, whatever their distance from the axis.
- What *does* vary with distance is the linear velocity, v = ωr — a common trap.
- Keep the distinction clear: angular velocity is a property of the whole rotating body; linear velocity scales with radius.
Topics covered: Physics Rotational Motion