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Work and Energy | Work and Energy - Exercise 11.5

Question 10

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.

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  • Solution

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Work is completed whenever the given 2 conditions are satisfied.

(i) A force acts on the body.

(ii) There’s a displacement of the body by the applying of force in or opposite to the the direction of the force.

When an individual holds a bundle of fodder over his head, then there's no displacement within the bundle of fodder. Although the force of gravity is functioning on the bundle, the person isn't applying any force thereon. Hence, within the absence of force, work done by the person on the bundle is zero.

"hello students welcome to leader learning this is ashwini i teach science at leader so here we have a question that is a person holds a bundle of hay over his head as you see in the picture for 30 minutes and gets tired has he done some work or not justify your answer so the answer is no it does not done any work okay because there are two conditions for work has to be done first one is a force act on the body and second is there is a displacement of the body by applying force in or opposite to the direction of the force then we only can say that that the work has done so in this picture as the individual holds a bundle of folder okay over his hat then there is no displacement within the bundle of folder it is as it is like static at at its place so although force of gravity is functioning on the bundle force of gravity is acting on the bundle itself but the person isn't applying any extra force or any external force on it hence within the absence of force work done by the person is on the bundle is zero so we can say that he does not done any work so this is all about this question if you have any doubts then please put it down in the comment section for more such video solutions please subscribe leader learning thank you "

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Question 10

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.

  • Solution

  • Transcript

Work is completed whenever the given 2 conditions are satisfied.

(i) A force acts on the body.

(ii) There’s a displacement of the body by the applying of force in or opposite to the the direction of the force.

When an individual holds a bundle of fodder over his head, then there's no displacement within the bundle of fodder. Although the force of gravity is functioning on the bundle, the person isn't applying any force thereon. Hence, within the absence of force, work done by the person on the bundle is zero.

"hello students welcome to leader learning this is ashwini i teach science at leader so here we have a question that is a person holds a bundle of hay over his head as you see in the picture for 30 minutes and gets tired has he done some work or not justify your answer so the answer is no it does not done any work okay because there are two conditions for work has to be done first one is a force act on the body and second is there is a displacement of the body by applying force in or opposite to the direction of the force then we only can say that that the work has done so in this picture as the individual holds a bundle of folder okay over his hat then there is no displacement within the bundle of folder it is as it is like static at at its place so although force of gravity is functioning on the bundle force of gravity is acting on the bundle itself but the person isn't applying any extra force or any external force on it hence within the absence of force work done by the person is on the bundle is zero so we can say that he does not done any work so this is all about this question if you have any doubts then please put it down in the comment section for more such video solutions please subscribe leader learning thank you "

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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