You are working in an ice skating rink and have been asked to hang a new banner on the wall. Your friend is helping you so that the ladder does not collapse by exerting a force FAL at an angle o relative to the horizontal. See the diagram below. You Wall FAL Ice Floor The ladder has a length L and makes an angle of 0 with respect to the vertical wall. You have a mass, my, and are a horizontal distance a from the wall. The ladder has a mass of m. Because the wall is slick, and the ice on the floor is slick, the frictional forces acting on the ladder are negligible.

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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!