A metal hook with a radius r is released from the rest on the incline. If the coefficient of static and kinetic friction are , determine the angular acceleration of the hook and time t for the hook to move a distance of S down the inclined. [ Figure A ]

Kinetics of body
A metal hook with a radius r is released from the rest on the incline. If the coefficient of static and kinetic friction are , determine the angular acceleration of the hook and time t for the hook to move a distance of S down the inclined. [ Figure A ]
Fig A		Fig B
The counterclockwise angular acceleration requires a counterclockwise moment about G, so F must be upword.