Strength of Materials

A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will_____.

  • A. remain horizontal
  • B. slant up towards direction of pull
  • C. slant down towards direction of pull
  • D. unpredictable
Answer: Option C.

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