An object of mass m is at rest on an inclined surface. The only forces acting on it are its own weight, friction, F with the surface and a normal force, N with the surface. Which of these statements must be true? A) N=mg and Fmg C) N

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!