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Q: Which of the following is not an example of work done ?
  • A. A man pushing against the wall
  • B. Trolley moves when the boy pushes the trolley
  • C. Applied force on an object in that direction the object is moving
  • D. Raise the book to some height and walking
Correct Answer: Option A - Work is said to be done when the body displaces form its initial position when the force is applied because. Work done (W) = Force x Displacement Here, in this case the wall does not displace from its initial position even though the force is applied and since here displacement is zero, so the work done is said to be zero.
A. Work is said to be done when the body displaces form its initial position when the force is applied because. Work done (W) = Force x Displacement Here, in this case the wall does not displace from its initial position even though the force is applied and since here displacement is zero, so the work done is said to be zero.

Explanations:

Work is said to be done when the body displaces form its initial position when the force is applied because. Work done (W) = Force x Displacement Here, in this case the wall does not displace from its initial position even though the force is applied and since here displacement is zero, so the work done is said to be zero.