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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    Work is said to be NOT done when an object moves

    A)  at an angle of \[{{90}^{o}}\] to the direction of the force.  

    B)  at an angle opposite to the direction of the force.

    C)  at any angle to the direction of the force.

    D)  along the direction of the force.

    Correct Answer: A

    Solution :

    \[W=F\,\,S=F\cos \theta \,\,S=F\cos 90\,\,S=0\]


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