Physics Rotational & Circular Motion DUHS 2022
PMDC Verified Question 63 of 95
Every particle of a rotating disc moves with:
A
Constant linear velocity
B
Constant angular velocity
C
Constant tangential velocity
D
Constant linear displacement
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Constant angular velocity
Concept:

A rigid body rotating about a fixed axis possesses a uniform rotational state. Every atom swings through the same angle in the same amount of time.

Solution:

  • Because it is a solid object, the disc does not shear or warp. Every single point on it completes a \( 360^\circ \) rotation in the exact same time frame.
  • Therefore, they all share identical constant angular velocity.


Why other options are incorrect:

  • Option A and Option C are incorrect because linear/tangential velocity (\( v = r\omega \)) depends heavily on the radius \( r \). Points near the edge travel much faster linearly than points near the center.
  • Option D is nonsensical for rotational continuous loops.

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