Calculating Force and Angular Momentum in Rolling Mechanics Experiment

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The experiment involves a magnetic stirrer creating a vortex in water, causing a marble to roll along the beaker's edge. The initial question focuses on calculating the force required for the marble's motion at a known speed and whether this can be used to determine the angular momentum of the water. While the force calculation is acknowledged as manageable, the challenge lies in relating the marble's energy to the water's angular momentum. The discussion suggests considering the relationship between rotational energy and kinetic energy to find a solution. Ultimately, understanding these dynamics is crucial for accurately linking the marble's motion to the water's behavior.
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The experiment consists of a magnetic stirrer and a marble in a beaker of water. When the magnetic stirrer is turned on a vortex is formed and the marble rolls along the edge of the beaker. If the speed of the marble is known, is it possible to work out the force required to roll the marble at a certain speed. If the force is worked out is it possible to work out the angular momentum of the water. Equations are much appreciated.
 
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Actually that was dumb i can work out the force needed to roll the ball. The problem is just how to translate that into the angular momentum of the water
 
hmm can i assume that the rotation energy + kinetic energy of the ball is equal to the kinetic energy of the water?
 

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