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What is the work done by a coolie walking on a horizontal platform with a load on his head?
When a coolie is walking on a horizontal platform with a load on his head, the work done will be zero.
As known work $W=Fd\cos\theta$
When $F\rightarrow$ applied force
$d\rightarrow$ displacement
$\theta\rightarrow$ angle between the applied force and the displacement direction$
Here $\theta=90^{\circ}$, therefore, $\cos90^{\circ}=0$
Therefore, work done $W=Fd\times0=0$
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