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How much work is done by a coolie walkin...

How much work is done by a coolie walking on a horizontal platform with a load on his head?

Text Solution

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W=0 as his displacement is along the horizontal direction and in order to balance the load on his head, he applies a force on it in the upward direction equal to its weight. Thus angle between force and displacement is zero.
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Knowledge Check

  • Assertion : A person working on a horizontal road with a load on his head does no work. Reason : No work is said to be done, if directions of force and displacement of load are perpendicular to each other.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If the assertion and reason both are false.

  • Consider the following statements. Work is not done, when: 1. a man is walking on a horizontal road. 2. a man is climbing up a hill. 3. a man with a load on his head is walking on a horizontal road. 4. moon is revolving round the earth. Which of the statements given above are correct?

    A
    1 and 3 only
    B
    1 and 4 only
    C
    2, 3 and 4
    D
    1, 3 and 4

  • Consider the following statements. Work is not done, when: 1. a man is walking on a horizontal road. 2. a man is climbing up a hill. 3. a man with a load on his head is walking on a horizontal road. 4. moon is revolving round the earth. Which of the statements given above are correct?

    A
    1 and 3 only
    B
    1 and 4 only
    C
    2, 3 and4
    D
    1, 3 and 4

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