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Frictional Torque depending on arm

  1. Apr 1, 2013 #1
    In the image I've attached in the link below, applied torque is constant in both cases.
    The black rings represent the surface area, but also the location of (angular) frictional force.
    So the further away the frictional force is from the axis of rotation, the higher the frictional torque is.
    The frictional torque is equal to the applied torque minus the friction coefficient multiplied by the force multiplied by the arm length.

    For fig.1: τf = τ - μFR
    For fig.2: τf = τ - μFr

    However, it would be independent from speed and acceleration.

    Do you agree with me?

    http://cognitivenetwork.yolasite.com/resources/Area.png [Broken]
    Last edited by a moderator: May 6, 2017
  2. jcsd
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