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 When do we say that work is done?


Whenever a force acts on a body and the body is displaced in the direction of the force, work is said to be done.

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Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’:

(i) Suma is swimming in a pond.

(ii) A donkey is carrying a load on its back.

(iii) A wind mill is lifting water from a well.

(iv) A green plant is carrying out photosynthesis.

(v) An engine is pulling a train.

(vi) Food grains are getting dried in the sun.

(vii) A sailboat is moving due to wind energy.


Define 1 Joule (J) of work.


Write an expression for the work done when a force is acting on an object in the direction of its displacement.


A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?


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