NCERT Question 13 - Chapter 11 Class 9 - Work and Energy

Last updated at August 14, 2026 by

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.

Remove Ads
Teachoo · Class 9 Explore Class 9
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. He teaches Science, Economics, Accounting and English at Teachoo using clear explanations and exam-focused methods students can trust.

For faster and distraction-free study, students can choose Teachoo Black.