ashna

How much work is done by a coolie walking on a horizontal platform with a load on his head ? justify .

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akash123

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zero

ashna

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can yu explain ?

akash123

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akash123

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N is the force applied by coolie on the load...right?

ashna

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yes

akash123

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|dw:1348894348026:dw|

akash123

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now...definition of work= F . (Displacement) it's a dot product....right?

ashna

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right

akash123

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|dw:1348894463777:dw|

akash123

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work done by coolie = N *( displacement) * cos 90'

ashna

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yes 0 , okay ty :)

akash123

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:)

sam291

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But if he wasn't exerting a force with the help of friction, on the platform, in the opposite direction from where he's going, then he wouldn't move forward. And the force in the opposite direction caused by friction will be greater because of the load on his head.
Am I wrong?