Physics-
General
Easy

Question

Three spools A, B and C are placed on rough ground and acted by equal force F. Then which of the following statement is incorrect?

  1. Frictional force on spool A is in backward direction    
  2. Frictional force on spool B is in backward direction    
  3. Frictional force on spool C is in backward direction    
  4. Frictional force on spool C is in forward direction    

The correct answer is: Frictional force on spool C is in forward direction


    For spool A, sliding tendency of point of contact is forward Þ frictional force is in backward direction For spool B, sliding tendency of point of contact is forward Þ frictional force is in backward direction For spool C, slidin7g tendency of point of contact is forward as without friction
    a equals fraction numerator F over denominator m end fraction comma alpha equals fraction numerator tau over denominator I end fraction equals fraction numerator F r over denominator fraction numerator m over denominator 2 end fraction open parentheses R to the power of 2 end exponent plus r to the power of 2 end exponent close parentheses end fraction rightwards double arrow alpha R equals fraction numerator 2 F R r over denominator m open parentheses R to the power of 2 end exponent plus r to the power of 2 end exponent close parentheses end fraction
    Here a > aR so acceleration of point of contact will be in forward direction. Þ frictional force is in backward direction.

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