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Frictional Torque at the axle

  1. Aug 21, 2009 #1
    Let us consider a wheel which rotates about an axle thorugh its center with an angular velociy [tex]\omega[/tex]0. After sometime it comes to rest due to the frictional torque at its axle.
    Now, if we go by the defination of torque than it is defined as:
    [tex]\tau[/tex]= r x F. Since the frictional torque is exerted along the axle, we can take the value of r as 0. Then there will not be any frictional torque. Kindly explain me??
     
  2. jcsd
  3. Aug 21, 2009 #2

    Doc Al

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    Staff: Mentor

    No you can't. Real axles with friction have non-zero radii.
     
  4. Aug 21, 2009 #3
    ok so, Frictional Torque is equal to the cross product of radius of axle and frictional force... Thanks :-)
     
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