JEE Main & Advanced Physics NLM, Friction, Circular Motion JEE PYQ - NLM Friction Circular Motion

  • question_answer
    A mass m = 1.0kg is put on a flat pan attached to vertical spring fixed on the ground. The mass of the spring and the pan is negligible. When pressed slightly and released, the mass executes simple harmonic motion. The spring constant is 500 N/m. What is the amplitude A of the motion, so that the mass m tends to get detached from the pan? [JEE ONLINE 22-04-2013]
                (Take g = 10 m/\[{{\operatorname{s}}^{2}}\]).
                The spring is stiff enough so that it does not get distorted during the motion.

    A)             \[\operatorname{A}>2.0\operatorname{cm}\]

    B) \[\operatorname{A}=2.0\operatorname{cm}\]

    C)             \[\operatorname{A}<2.0\operatorname{cm}\]

    D) \[\operatorname{A}<1.5\operatorname{cm}\]

    Correct Answer: C

    Solution :

    [c] As \[F=-kx\]

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