9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    Two blocks made of different metals identical in shape and size are acted upon by equal forces which cause them to slide on a horizontal surface. The acceleration of the second block is found to 10 times that of the first. What is the ratio of the mass of the second to the first?

    A) 1 : 10              

    B)        1 : 1    

    C)        10 : 1              

    D)        1 : 5

    Correct Answer: A

    Solution :

    \[\frac{\text{Acceleration of first block, }{{\text{a}}_{1}}}{\text{Acceleration of second block, }{{\text{a}}_{2}}}=\frac{1}{10}\] \[\because \]Force is same on both the blocks. \[\therefore \] \[F={{m}_{1}}{{a}_{1}}={{m}_{2}}{{a}_{2}}\] \[\frac{{{a}_{1}}}{{{a}_{2}}}=\frac{{{m}_{2}}}{{{m}_{1}}}\therefore \frac{{{m}_{2}}}{{{m}_{1}}}=\frac{1}{10}\]


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