Question

When a worker climbs a staircase with some load on his head, the work done on the load by the force applied by the worker is _________​

Answer 1

Answer:

Work done is 0.

Explanation:

When Porter stands on the platform with suitcase in his head,then there is no moment in suitcases. So, work done by Porter on suitcase is 0. ... When ball is thrown upward, it displaces in upward direction but Force of gravity acts in downward direction, so Work Done by Force of gravity is negative

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Answer 2

Answer:

Explanation:

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 [math]W=\vec{F}\cdot\vec{S}[/math],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.