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EAMCET Medical EAMCET Medical Solved Paper-2003

  • question_answer
    A horizontal force, just sufficient to move a body of mass 4 kg lying on a rough horizontal surface, is applied on it. The coefficients of static and kinetic friction between the body and the surface are 0.8 and 0.6 respectively. If the force continues to act even after the block has started moving, the acceleration of the block in \[\text{(}g=10\text{ }m/{{s}^{2}}\text{) }m/{{s}^{2}}:\]

    A)  \[\frac{1}{4}\]                                  

    B)  \[\frac{1}{2}\]

    C)  2                                            

    D)  4

    Correct Answer: C

    Solution :

                     Given: Mass of body \[m=4\,kg\] Static friction between body and surface \[{{\mu }_{s}}=0.8\] Kinetic friction between body and surface \[{{\mu }_{k}}=0.6\] Resultant force is given by \[={{f}_{s}}-{{f}_{k}}\] \[ma={{\mu }_{s}}mg-{{\mu }_{k}}\,mg\] \[a=({{\mu }_{s}}-{{\mu }_{k}})g=(0.8-0.6)10\] \[=0.2\times 10=2\,m/{{s}^{2}}\]


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