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Work

In which case...

Question

In which case, work is not done?

A

a girl swimming in a pond

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B

a windmill lifting water from a well

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C

a standing man holding a suit case in his hand

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D

a sail boat moving in the direction of wind

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Solution

The correct option is C a standing man holding a suit case in his hand
According to definition: Work is done whenever the given condition is satisfied.
(i) a force should act on an object
(ii) there is a displacement of the body caused by the applied force along the direction of the applied force.
No displacement takes place in the given case:(a standing man holding a suit case in his hand)
so,the work is not done by a standing man holding a suit case in his hand.

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Similar questions

Q. Look at the activities listed below. Reason out whether work is done or not done in the light of your understanding of the term 'work'.
(a) Suma is swimming in a pond.
(b) A donkey is carrying a load on its back.
(c) A windmill is lifting water from a well.
(d) A green plant is carrying out photosynthesis.
(e) An engine is pulling a train.
(f) Food grains are getting dried in the sun.
(g) A sailboat is moving due to wind energy.

Q. In which of the following cases is the work done positive or zero or negative?
a) Work done by the porter on a suitcase in lifting it from the platform on to his head.
b) Work done by the force of gravity on suitcase as the suitcase falls from porter's head.
c) Work done by the porter standing on platform with suitcase on his head.
d) Work done by force of gravity on a ball thrown up vertically up into the sky.
e) Work done by force applied by hands of a man swimming in a pond.

Q. Question 1
Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term 'work'.
• Suma is swimming in a pond.
• A donkey is carrying a load on its back.
• A wind mill is lifting water from a well.
• A green plant is carrying out photosynthesis.
• An engine is pulling a train.
• Food grains are getting dried in the sun.
• A sailboat is moving due to wind energy.

Q. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term 'work'.
(A). Suma is swimming in a pond.
(B). A donkey is carrying a load on its back.
(C). A wind-mill is lifting water from a well.
(D). A green plant is carrying out photosynthesis.
(E). An engine is pulling a train.
(F). Food grains are getting dried in the sun.
(G). A sailboat is moving due to wind energy.

In which of the following cases is work being done :

(a) A boy pushing a heavy rock

(b) A boy climbing up the stairs

(c) A coolie standing with a box on his head

(d) A girl moving on the road.

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