Posted by Elizabeth on Sunday, November 15, 2009 at 4:39pm.
There are two forces action on the marble: centripetal and weight. Centripetal moves the marble toward the center, and gravity moves it downward. How much downward really depends on friction. Friction has two components, rolling, and sliding. For the marble to move downward, it has to start sliding downward first. Sliding fricion is usually much more than rolling friction. So, the marble will stay almost horizontal, but in fact it is moving downward. As the marble slows, the angle of velocity downward increases, (velocity tangent slows, falling velocity increases).
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