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.
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Explanation:
Work is being done by Seema because she displaces the water by applying the force.
No work is being done by the donkey because the direction of force i.e the load is vertically downward and displacement is along the horizontal. If displacement and force are perpendiculars then no work is done.
Work is done because the windmill is lifting the water i.e., it is changing the position of water.
No work is done because there are no force and displacement.
Work is done because the engine is changing the position of the train.
No work’ is done because there is no force and no displacement.
Work is done because the force acting on the boat is moving it.
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