Comment on the statement," A labor carrying bricks on his head on a level road from one place to another is doing no work."
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Explanation:
When a worker is carrying a load on his head, what is the work done by him? If he carries the load on his hands above his head, then what is the work done?
Work done in physics is not as of daily life.
Until displacement by a force applied,there is no work.
So when the worker carrying a luggage on his head or on his hand then no work is done.
It has two causes,
As you know W=F⃗ ⋅S⃗ ,so here there is no displacement,hence no work done.
According to work energy theorem work done is equal to change in kinetic energy.But here no change in kinetic energy. So work done is zero.
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