1. The problem statement, all variables and given/known data "A brick is in a bucket. The professor twirlings the bucket around his head in a circular motion. The moment that bucket is directly over his head. The tension is zero. What is the acceleration of the brick at this given moment? I narrowed it down to two answers. a) The tension cannot be zero b) the acceleration is 9.8 m/s^2 DOWN 3. The attempt at a solution I believe the tension cannot be zero because if there was no tension in the string, it would no longer continue on its circular motion. The only thing that bothers me is the acceleration. I understand that the acceleration is proportional to the force, which would be the centrifugal force (centre seeking), so it would of course be down. I asked the professor during the exam, "Don't both answers go hand in hand? are there not two answers for this question?". He said the question still stands. SO URRRRRRRRRRRG Any help would be appreciated!