If a block had constant density and laid on a slope with angle $\theta$ then the angle of friction and the horizontal would be $\theta$. If there was a ball with constant density then the friction force would also pass through the contact point and have angle $\theta$ with the horizontal.
However, if there was a weighted part of the ball then I learned the friction force would still pass through the contact point, but it would not have an angle $\theta$ with the horizontal.
What causes this and what is the angle? I read it’s the angle of line from the weighted section to the center and the vertical line, why is this so?