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Q.

A spool is pulled by a force in vertical direction as shown in figure. What is the direction of friction in this case? The spool does not loose contact with the ground.

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a

         (1) Rightward

 

 

 

b

         (2) leftward

c

         (3) Upward

d

         (4) Downward

answer is B.

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Detailed Solution

Weight mg does not produce any moment about the centre of the cylinder. Applied force F produces anticlockwise moment about the centre of the cylinder So to prevent slipping ,the frictinonal force acting on the spool must point in the left .

 

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