In case of a flat collar bearing, the frictional force in case of uniform pressure may be assumed to be acting at -
1
\(\rm \left(\frac{r_1^3\,-\,r_2^3}{r_1^2\,-\,r_2^2}\right)\)
2
\(\rm \frac{1}{2}\left(\frac{r_1^3\,-\,r_2^3}{r_1^2\,-\,r_2^2}\right)\)
3
\(\rm \frac{2}{3}\left(\frac{r_1^3\,+\,r_2^3}{r_1^2\,-\,r_2^2}\right)\)
4
\(\rm \frac{2}{3}\left(\frac{r_1^3\,-\,r_2^3}{r_1^2\,-\,r_2^2}\right)\)