A yo-yo-shaped devicemounted on a horizontal frictionlessaxis is used to lift a 30 kgbox . Theouter radius R of the device is0.50 m, and the radius r of thehub is 0.20 m. When a constanthorizontal force of magnitude140 N is applied to a ropewrapped around the outside ofthe device, the box, which is suspendedfrom a rope wrappedaround the hub, has an upwardacceleration of magnitude 0.80m/s2.What is the rotational inertiaof the device about its axis of rotation?

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.