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

  • question_answer
    Force of friction between the floor and a wooden block of mass M and area of surface A is F. Force of friction between the floor and a block of mass 2 M and area of surface A will be

    A)  2 F                          

    B)         F

    C)  \[\frac{F}{2}\]                  

    D)         \[\sqrt{2}F\]

    Correct Answer: A

    Solution :

     Force of friction does not depend upon area but does depend on normal reaction\[i.e.,\,\,M\].             \[F=\mu R=\mu {{M}_{g}}\propto M\]


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