A box is at rest on an inclined surface. Which diagram correctly illustrates all forces, including any component forces? Assume the x-axis is parallel to the surface. A box on an incline is shown with vectors radiating from a point in the center of the box. The first force vector is straight up and labeled F Subscript N Baseline. The second is straight down and labeled F Subscript g Baseline. It is equal in length to the vector pointing upward. The third vector is pointing up the incline and parallel to it, labeled F Subscript f Baseline. The fourth force is broken up into two perpendicular vectors labeled F Subscript f y Baseline and F Subscript f x Baseline.

A box on an incline is shown with vectors radiating from a point in the center of the box. The first vector is parallel to the incline, labeled F Subscript f Baseline. The second vector is perpendicular to and away from the surface, labeled F Subscript N Baseline. The third vector is pointing perpendicular and into the plane, labeled F Subscript g Baseline.

A box on an incline is shown with vectors radiating from a point in the center of the box. The first vector points up from the point and parallel to the surface of the incline, labeled F Subscript f Baseline. A second vector points down the incline from the point parallel to the surface of the incline, labeled F Subscript g Baseline. A third vector is perpendicular to and away from the surface of the incline from the point, labeled F Subscript N Baseline.

A box on a 20 degree incline is shown with vectors radiating from a point in the center of the box. The first vector points up and parallel to the surface of the incline, labeled F Subscript f Baseline. A second vector points toward the center of the earth labeled F Subscript g Baseline. A third vector is perpendicular to and away from the surface of the incline, labeled F Subscript N Baseline. A fourth vector is broken into 2 components, one parallel to the surface and down the incline, labeled F Subscript g x Baseline, and one perpendicular to the surface and into the surface, labeled F Subscript g y Baseline.