SELECT * FROM question_mgmt as q WHERE id=4213 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=191 and ex_no='5' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Work and Energy a person holds a bundle of hay over his head for 3

Question:

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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