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Question
Site an example in day to day life where work done is zero.
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** A person holding a heavy mass on his shoulders doesn't do any work(work is zero) even if he stands for a long time. (But if he's moving with it for sometime means he has done work which would be total mass times total vertical displacement.Horizontal displacement is not taken into consideration.) **when a man pushes a wall. There is no displacement of the wall. Thus, there is no work done. ** An example would be lifting a box up from the floor and then putting it down. As you lift it, you do positive work on the box (your force is in the same direction as the box's motion), but as you set it back down you do negative work (your force is up, keeping the box from accelerating to the floor, and the motion is down, as the box moves steadily). Here you have to remember that when force is opposite displacement the work is negative (if you know about vectors, work = force "dot" displacement).
(But if he's moving with it for sometime means he has done work which would be total mass times total vertical displacement.Horizontal displacement is not taken into consideration.)
**when a man pushes a wall. There is no displacement of the wall. Thus, there is no work done.
** An example would be lifting a box up from the floor and then putting it down. As you lift it, you do positive work on the box (your force is in the same direction as the box's motion), but as you set it back down you do negative work (your force is up, keeping the box from accelerating to the floor, and the motion is down, as the box moves steadily). Here you have to remember that when force is opposite displacement the work is negative (if you know about vectors, work = force "dot" displacement).
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