Mass Sliding Down a Rotating Inclined Tube with Friction

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A particle of mass slides from the center of a rotating tube at an angle with a vertical bar. The angular velocity and the friction coefficient determine the direction in which the particle slides.

Contributed by: Enrique Zeleny (September 2012)
Open content licensed under CC BY-NC-SA



The equation for is


with the normal force


The conditions for incipient outward and inward motion are, respectively,




for .


[1] D. T. Greenwood, Advanced Dynamics, Cambridge, UK: Cambridge University Press, 2003.

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