JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Sample Paper Topic Test - Work Energy Power

  • question_answer
    If only conservative forces are working in the system and we apply some external force

    A) \[{{W}_{ext}}=\Delta U\](always)     

    B) \[{{W}_{\text{conservative}}}=-\Delta U\](always)

    C) \[{{W}_{ext}}=\Delta U+\Delta KE\] (always)   

    D) \[{{W}_{\operatorname{co}nservative}}=-\Delta KE\]

    Correct Answer: B

    Solution :

    [b] If only conservative forces are acting in the system.
    \[\Rightarrow \] \[{{W}_{ext}}=\Delta U\] (If body moves without acceleration)
    \[{{W}_{ext}}=\Delta U+\Delta KE\]
    (if body moves with acceleration)
    \[\Rightarrow \] \[{{W}_{\text{conservative}}}=-\Delta U\] (always)

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