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??