Static friction is greater than kinetic friction on an inclined surface because static friction must overcome the initial resistance to motion. When a stationary object, like a heavy box, is pushed, it experiences higher static friction until enough force is applied to initiate movement. Once the object is in motion, kinetic friction takes over, which is typically lower and requires less force to maintain movement. This difference in friction types is due to the molecular interactions between surfaces, which are stronger when stationary. Understanding this concept is essential for grasping the mechanics of motion on inclines.