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

  • question_answer
    A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the lock. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is

    A)  2.5 N                

    B)         0.98 N

    C)  4.9 N              

    D)         0.49 N

    Correct Answer: A

    Solution :

     Here, the force responsible for pressing the interlocking?s is the force of action\[,\]\[5N\]. So, the force of reaction is also equal to\[5N\]. Now,     \[f=\mu R=0.5\times 5=2.5\]


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