In which case- work is not done- a girl swimming in a ponda windmill lifting water from a wella standing holding a suit in his handa sail boat moving in the direction of wind

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Standard IX

Physics

Question

In which case, work is not done?
a girl swimming in a pond
a windmill lifting water from a well
a standing man holding a suit case in his hand
a sail boat moving in the direction of wind

a girl swimming in a pond

a standing man holding a suit case in his hand

a windmill lifting water from a well

a sail boat moving in the direction of wind

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Solution

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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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In which case, work is not done? a girl swimming in a ponda windmill lifting water from a wella standing man holding a suit case in his handa sail boat moving in the direction of wind

In which case, work is not done?
a girl swimming in a pond
a windmill lifting water from a well
a standing man holding a suit case in his hand
a sail boat moving in the direction of wind