661while going upwards in an elevator positive work is done by normal force also while going downwards it does a negative work. so it is a good example where normal force does work.
Can the normal force on an object ever do work? Explain
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4 Answers
661
337I think yes.
An iron nail is placed on water. It sinks as the normal reaction is not enough to keep it floating. So work by normal force = fs cos theta. But here the nail sinks, so work by normal reaction is opposite to that of the direction of displacement. So theta =180. And cos 180=-1. So work done is negative, but some work is done.
Hope it helps....
- Debal Roy we can explain the example you given above with archimedes priciple...it would be better if you will explain my question with solid surface...think again...but your try is good....Upvote·0· Reply ·2013-03-13 21:34:16
226yes when u r pussing a roller the normal reaction is acting against the force which u r applying to push it..
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