Physics - Rotation Question with Solution | TestHub

A rolling ball slows down because the normal force does not pass exactly through the CM of the ball, but passes in front of the CM. This is rolling friction. v and $\omega$ both decrease such that $\mathrm{v}=\mathrm{r}\omega$ is maintained. Assume that deformation is small so that friction acts at ${\mathrm{r}}_0$ from centre. ( ${\mathrm{r}}_0$ is radius of ball).