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I was just wondering regarding this.

When we swing a bob tied to a thread, completely perpendicular to the vertical wall (that is, parallel to the floor), what force balances the weight of the bob?

I don't think it can be mv^2/r because that centripetal force is perpendicular to the weight of the bob (thus mv^2 cos90 = 0N).

What force balances the weight of the bob?

Thanks!