7th Class Science Related to Competitive Exam Question Bank Work and energy

  • question_answer
    No work is done when

    A) a nail is plugged into a wooden board

    B) a box is pushed along a horizontal floor

    C) there is no component of force parallel to the direction of motion

    D) there is no component of force normal to the direction of force

    Correct Answer: D

    Solution :

        there is no component of force normal to the direction of force


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