ashna
A potter moving vertically up the stairs with a suitcase on his head does work . why ?



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akash123
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try it by ur own...I'll help u

ashna
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but i dont know and that is why i asked this question , give me the hints :)

ashna
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and if you dunt mind can you teach me all types of questions like dis ?

akash123
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1st make a block of mass m as I did in last question...

akash123
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dw:1348895105918:dw

akash123
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and coolie is holding it on his head...right?

ashna
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yes right !

akash123
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now u have to tell...who or what is exerting force on this load?

akash123
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1st earth is pulling towards its center by force mg..right?

ashna
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N

ashna
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YES

akash123
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dw:1348895307961:dw

akash123
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and u have to find out..work done by the potter?

akash123
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and the potter is exerting a force N on the load and the direction of force is vertically upward.

akash123
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again work done by potter= Force. displacement
= N *( displacement) * cos(theta)

ashna
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vertical so cos 0 = 1

akash123
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now this time u have to tell the value of theta if potter is moving vertically up

akash123
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yes...perfectly right...:)

akash123
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so potter has done some work...because work done is not equal to zero

ashna
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yeah , okay ty :D

akash123
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:)