Minimum Speed for Water in a Bucket Revolving in a Vertical Circle (5:57)
What is the minimum angular speed necessary to keep water in a vertically revolving bucket? The rope radius is 0.77 m. This is an AP Physics 1 topic.

Content Times:
0:13 The demonstration
0:35 Understanding the problem
1:04 Where do we draw the Free Body Diagram
2:06 Summing the forces
3:04 What happens at the minimum angular speed
3:53 Why the force of tension is zero
4:41 Solving the problem