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[[File:Blockonincline.png|thumb|500px|right|The brown triangle is the fixed inclined plane and the black block is placed on it with a dry surface of contact.]]
The scenario here is a dry block (with a stable surface of contact) on a dry ''fixed'' [[involves
simple machine::inclined plane]], with <math>\theta</math> being the angle of inclination with the horizontal axis.
The extremes are <math>\theta = 0</math> (whence, the plane is horizontal) and <math>\theta = \pi/2</math> (whence, the plane is vertical).