1. The problem statement, all variables and given/known data Hi, I have a question about a bucket filled with water being swung in a vertical circular path. I'm wondering why at the top of this swing, the reaction force of the bucket on the water can be 0? (ie. why is the minimum centripetal force required only the weight of the water?) Then, why can the reaction force only be 0 when the bucket is at the top of its swing? Further, how else does the reaction force fluctuate throughout a full 360 swing? 2. Relevant equations F=mv^2/r mv^2/r = mg + R Minimum v^2 = rg 3. The attempt at a solution R= 0 mv^2/r = mg .... but I have no clue why Thanks.