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  4. A pencil is placed vertically on a table top with its point end up and its sticky eraser end down. As it falls over from this unstable position, its point of contact with the table remains stationary during its fall, the tangential acceleration of its tip.

Q. A pencil is placed vertically on a table top with its point end up and its sticky eraser end down. As it falls over from this unstable position, its point of contact with the table remains stationary during its fall, the tangential acceleration of its tip.

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Solution:

torque on pencil is


This we can see it exceeds when

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