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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Third Law of Motion

  • question_answer
    A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight of 25 N. The bird (mass m = 0.5 kg) flies upward in the cage with an acceleration of \[2\,m/{{s}^{2}}\]. The spring balance will now record a weight of [MP PMT 1999]            

    A)             24 N               

    B)             25 N             

    C)             26 N               

    D)             27 N

    Correct Answer: B

    Solution :

                    Since the cage is closed and we can treat bird, cage and the air as a closed (isolated) system. In this condition the force applied by the bird on cage is an internal force, due to this the reading of spring balance will not change.            


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