Rotational MotionMedium
Question
A uniform rod AB of length is free to rotate about a horizontal axis passing through A. The rod is released from rest from horizontal position. If the rod gets broken at midpoint C when it becomes vertical, then just after breaking of the rod :
Options
A.Angular velocity of upper part starts to decrease while that of lower part remains constant.
B.Angular velocity of upper part starts to decrease while that of lower part starts to increase
C.Angular velocity of both the parts is identical
D.Angular velocity of lower part becomes equal to zero
Solution
On upper part torque of mg about A will decrease the angular velocity. 
Lower part of rod will not experience any couple hence its angular velocity can′t change. Initially both parts are having same angular velocities.Create a free account to view solution
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