Question

what is pseudo force?explain when it is used.

Answer 1

This force is pseudo force . It acts on objects that are in motion relative to a rotating frame of reference . ... Pseudo-force is a term mostly used when defining the behavior of non-inertial frames of reference, where applying this concept may simplify the calculations by reducing them to Newtonian physics.

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Answer 2

newtons gives it's law of motion in inertial frame of reference.  but we are in non inertial frame of reference so pseudo force arises in non inertial frame of reference and it does not arise from any physical interaction.