Guest

Why is the work fone by normal zero,while climbing up the stairs,what is the wd by normal in case of elevator and lift?

Why is the work fone by normal zero,while climbing up the stairs,what is the wd by normal in case of elevator and lift?

Grade:11

2 Answers

Eshan
askIITians Faculty 2095 Points
5 years ago
Dear student,

While climbing the stairs, the point of application of the normal force, that is, the foot does not move while the force is being applied onto it; but it moves only when it leaves contact with the stairs, when the normal force is itself withdrawn.

But while in an elevator, the whole lift as well as the body displaces and hence the normal reaction stays even when displacement of the point of application of foot is taking place, and so some finite work is done on it.
Arun
25750 Points
5 years ago
There is no work being done by the ladder/stairs. The man exerts a force on the stairs but as long as the stairs don`t move, there is no energy being transferred. Work equals force times distance and this case the distance is 0

Think You Can Provide A Better Answer ?

ASK QUESTION

Get your questions answered by the expert for free