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

  • question_answer
    Two mass A and B each of mass M are fixed together by a massless spring A force F acts on the mass B as shown in figure. At the instant shown, the mass A has acceleration a. What is the acceleration of mass B ?

    A)  \[\left( \frac{F}{M} \right)-a\]    

    B)         \[a\]

    C)  \[-a\]                   

    D)         \[\left( \frac{F}{M} \right)\]

    Correct Answer: A

    Solution :

     Here, the two masses are not tied by inextensible string. So, acceleration in different blocks will be different. Net force on block\[A=Ma\] Remaining force on \[B=F-Ma\] Acceleration of block\[B=\frac{F-Ma}{M}\]


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