Question is in the photo please help ??

There are three forces on the rod

• Normal force, N between rod and surface – vertically upwards
• Gravitational force, mg – vertically downwards
• frictional force, f – horizontally towards right

Also, it is important to note that since there is no slip at the point of contact of rod with the surface, the rod is doing pure rotation about A which act as a hinge point. So direction of acceleration (Let’s call it a) is perpendicular to rod downwards.

Now it is straightforward to calculate a and limiting value of friction. Let’s apply equation of motion for translation in horizontal and vertical directions:

Using, we get


Now, considering moment of mg about A, we get

Using two expressions for a, we get


Instantaneous acceleration of COM is a, while that of B is 2a using.