Roll and Roll
A small particle of mass m is attached at B to a hoop of mass m and radius r, whole system is placed on the rough horizontal ground. The system is released from rest when B is directly above A ( geometrical centre of the ring) and rolls without slipping. Find the angular acceleration (in ) of the system at the instant when AB becomes horizontal.
The answer is 10.
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1 solution
We can also use the concept of instantaneous center of rotation.
Edit: there's a writing mistake, please notice that in fbd of hoop normal rxn by the ground is not "N1" but is "N" thus in third equation below fbd of hoop, it should be "N" rather than "N1"