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Work and Energy — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceWork and Energy1 Mark
MCQ
Each of the following statement describes a force acting. Which force is causing work to be done?
  • A
    The weight of a book at rest on a table.
  • ✓
    The pull of a moving railway engine on its coaches.
  • C
    The tension in an elastic band wrapped around a parcel.
  • D
    The push of a person's feet when standing on the floor.
✓

Answer

Correct option: B.
The pull of a moving railway engine on its coaches.
$a.$ The weight of a book at rest on a table cannot do any work as the book is at rest. So, the work done by this force is zero.
$b.$ The pulling force applied by the railway engine on its coaches is doing work, as the force applied by the engine results in the motion of the coaches.
$c.$ The tension force in an elastic band wrapped around a parcel cannot do any work, as there is no motion of the parcel because of the tension force of the rubber band.
$d.$ The push of a person’s feet on a floor when he is standing cannot do any work because there is no motion involved due to the applied force.

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