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Inner and outer radii of spool are r and r respectively. A thread is wound over its inner surface and placed over a rough horizontal surface. |
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Answer» e given,Inner and outer radii of spool are r and R respectively. A thread is wound over its inner SURFACE and placed over a rough horizontal surface.In the ROLLING action the VELOCITY will be, v=RωAt bottom-most point, velocity mostly EQUAL to zero.Hence, in clockwise direction, tread winds also friction acts left wards to increase.Therefore, friction acts left SIDE and thread unwinds, spool rotates anticlockwise direction. |
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