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

  • question_answer
    An object of mass 2 kg is sliding with a constant velocity of \[4m{{s}^{-1}}\] on a frictionless horizontal table. The force required to keep the object moving with the same velocity is               (NCERT Exemplar)

    A) 32N                                         

    B) 0N

    C) 2N                                           

    D) 8N

    Correct Answer: B

    Solution :

    [b] Given, mass m = 2 kg, velocity v = 4 \[{{\operatorname{ms}}^{-1}}\] As the object is moving with a constant velocity i. e., a \[{{\operatorname{ms}}^{-1}}\] so the acceleration of the object is zero i.e., a = 0 and according to the property of inertia if there is no external force acting on the body, then body remains as it is i.e., if the body is at rest, remains at rest and if it is in motion, remains in motion.


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