Look at the activities listed below.
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’.
(i) Suma is swimming in a pond.
(ii) A donkey is carrying a load on its back.
(iii) A windmill is filling 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.
Ans. (i) Work is done because the displacement of swimmer takes place in the direction of applied force.
(ii) If the donkey is not moving, no work is done as the displacement of load does not take place in the direction of applied force.
(iii) Work is done, as the displacement takes place in the direction of force.
(iv) No work is done, because no displacement takes place.
(v) Work is done, because displacement takes place in the direction of applied force.
(vi) No work is done, because displacement does not take place.
(vii) Work is done, because displacement takes place in the direction of the force.
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