Question

Difference between polar moment of inertia and radius of gyration

Answer 1

Moment of inertia:- it is also called the second moment of area , it is the product of area and the squares of its moment abt its axis

Radius of gyration

K=root I/A

Answer 2

Inertia is a force. Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity

An object would not have any inertia in a gravity-free environment (if there is such a place). Inertia is the tendency of all objects to resist motion and ultimately stop.