Is this true?

[VCEMan94]

"This is because, as also shown on the table, as the angle increases so too does the G.P.E increases which means that the friction force acting on the ball decreases since the gravity force strengthens."

Saw it in a chapter about incline motion in an old textbook and just wondering if thats actually true

[xZero]

the friction force depends on the co-efficient of friction and the normal force acting on the object. If the angle increases, the normal force on the object decreases, hence the friction force from the surface to the object decreases. (the co-efficient of friction is a constant for a particular object and surface or at least in VCE physics they are)