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A rock tied to a post moves in a circle at constant speed on a frictionless horizontal surface. All the forces acting on the rock are shown: Tension T, support force n by the table, and the force due to gravity W.
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In this case the rock is tied to a string and swings in a circular path as shown. It is not resting on a surface. No friction. Use the parallelogram rule and find the resultant of vectors T and W.
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In the case shown below, the rock rides on a horizontal disk that rotates at constant speed about its vertical axis (dotted line). Friction prevents the rock from sliding.
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Now the rock is held in place by friction against the inside wall of the rotating drum.
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More challenging! This time the rock rests against the frictionless inside wall of a cone. It moves with the cone, which rotates about its vertical axis (dotted line). The rock does not slide up or down in the cone as it rotates.