Inertial and Non-Inertial Frames – Rankers Physics

Pseudo Force: Practice Problem & Solution

Assertion (A): A particle on earth found to be at rest when seen from a frame \(U_1\) and moving with a constant velocity when seen from another frame \(U_2\). Then both frames may be non-inertial. Reason (R): A reference frame attached to the earth must be an inertial frame.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Pseudo Force. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true. Earth is a non-inertial frame, so frames observing a particle on Earth can also be non-inertial. Reason (R) is false because a frame attached to Earth is technically non-inertial due to Earth's rotation and orbital motion.

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