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8th Class Science Force and Pressure Question Bank Force and Pressure

  • question_answer
    Stones A, B, C and D of same masses are thrown on a wall. Acceleration produced in them are \[2m/se{{c}^{2}},\text{ }3\text{ }m/se{{c}^{2}},\text{ }5\text{ }m/se{{c}^{2}},\text{ }4\text{ }m/se{{c}^{2}}\] respectively. Arrange the force exerted by the stones in descending order.

    A) \[{{f}_{A}}>{{f}_{B}}>{{f}_{C}}>{{f}_{D}}\]

    B)          \[{{f}_{D}}>{{f}_{C}}>{{f}_{B}}>{{f}_{A}}\]

    C) \[{{f}_{A}}>{{f}_{B}}>{{f}_{D}}>{{f}_{C}}\]          

    D) \[{{f}_{C}}>{{f}_{D}}>{{f}_{B}}>{{f}_{A}}\]

    Correct Answer: D

    Solution :

        Since, F=ma for stone \[A,{{F}_{A}}=2m\] for stone \[B,{{F}_{B}}=3m\] for stone \[C,{{F}_{C}}=5m\] for stone \[D,{{F}_{D}}=4m\] Then descending order of force exerted on the ground \[{{f}_{C}}>{{f}_{D}}>{{f}_{B}}>{{f}_{A}}\]


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