Class 9 Science - Chapter Work and Energy NCERT Solutions | A person holds a bundle of hay over his

Welcome to the NCERT Solutions for Class 9th Science - Chapter Work and Energy. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 13: a person holds a bundle of hay over his head for 3....
Question 13

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

Work is done whenever the given conditions are satisfied:

(i) Force is applied.

(ii) Displacement takes place.

(iii) The angle between the force and displacement is not 90 degrees.

When a person holds a bundle of hay over his head, then the bundle of hay remains stationary. Although, force of gravity is acting on the bundle, the person is not applying any force on it. Hence, in the absence of force, work done by the person on the bundle is zero.

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