When a marble rolls up a hill, the primary forces acting on it are gravity, normal force, and friction. Gravity pulls the marble downward, acting against its upward motion, while the normal force acts perpendicular to the surface of the hill, supporting the marble. Friction occurs between the marble and the hill's surface, opposing the marble's motion and helping to stabilize it. As the marble ascends, these forces determine its acceleration and eventual stopping point.
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