A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer

Answer

Person holds a bundle of hay over his head.jpg

 

Work is done when

  1. Force is applied
  2. Displacement takes place
  3. The angle between the force and displacement is not 90 ° .

 

When a person holds a bundle of hay over his head,

he applies force to hold it

but there is no displacement.

 

Since the displacement is zero, no work is done.

  1. Class 9
  2. Chapter 11 Class 9 - Work and Energy

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 9 years and a teacher from the past 16 years. He teaches Spoken English, Written English, Grammar and Vocabulary at Englishtan.