Problem 1 The mass of the crane is 15,800 kg. The crane's cable is attached to a caisson whose mass is 360 kg. The tension in the cable is 950 N. (a) Draw the free-body diagram and determine the magnitudes of the normal and friction forces exerted on the crane by the level ground. (b) Draw the free-body diagram and determine the magnitudes of the normal and friction forces exerted on the caisson by the level ground. 45°

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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!