CIE M1 Forces Question. Watch

Zishi
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My problem in this question is explained in the attached file.
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steve10
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For part (ii),

Draw a circle around the ring at B, mark all the forces entering or leaving that circle and treat it as a separate system.

You have a tension in the string, BM, acting out. This can be resolved into horizontal and vertical components.
You have the mass of the ring, acting vertically down.
The ring is on the point of moving upwards, so you must have a frictional force acting vertically down.
Now collect together all the forces acting vertically, the forces acting horizontally and apply the friction equation, F=\mu\cdot NR
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Zishi
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Wow, thanks a lot!! =)
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