A porter carrying a load on his head on a horizontal road does no work against _______.

friction

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gravity

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electromagnetic

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magnetic

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Solution

The correct option is B gravity
$W o r k = \to F . \to s$
In case of gravity, the angle between $\to F$ & $\to s$ is $90^{o}$ ,
Hence we have
$\to F . \to s = F S c o s 90^{o}$
$= F s \times 0$
$= 0$
Hence, porter carrying a load on his head on a horizontal road does no work against gravity.

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A porter carrying a load on his head on a horizontal road does no work against _______.

The correct option is B gravity Work=→F.→sIn case of gravity, the angle between →F & →s is 90o,Hence we have→F.→s=FScos90o=Fs×0=0Hence, porter carrying a load on his head on a horizontal road does no work against gravity.

The correct option is B gravity
$W o r k = \to F . \to s$
In case of gravity, the angle between $\to F$ & $\to s$ is $90^{o}$ ,
Hence we have
$\to F . \to s = F S c o s 90^{o}$
$= F s \times 0$
$= 0$
Hence, porter carrying a load on his head on a horizontal road does no work against gravity.