Timeline for Why is work done defined the way it is? What's the intuition here?
Current License: CC BY-SA 3.0
13 events
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| Jun 26, 2017 at 20:57 | comment | added | Dronz | Yeah "work" has to be one of the most misunderstandable terms in physics, because it really is not used the way it is used in English. "Change in potential energy", how about? I will never forget a grade school class we had to take called "Physical Education Lab" trying to teach us about the science of bodily exercise - the teachers and textbook tried to use physics' definition of work, and persisted that descending a flight of stairs took the same work as climbing - I almost convinced him to give us a ride to the top of a hill for us to walk down for a workout. | |
| Jun 26, 2017 at 15:29 | comment | added | Hritik Narayan | Glad to help! Hope to see you here with better and better questions. | |
| Jun 26, 2017 at 15:28 | comment | added | Sushant Gupta | Makes sense. I can't be more thankful to you for clarifying my understanding on this concept. Can't tell how excited I am to learn more Physics. | |
| Jun 26, 2017 at 15:26 | comment | added | Hritik Narayan | Yeah but also, the total energy you expend equals the energy you've lost plus the energy gained by the body you did work on. (but the $F.dl$ part is just the K.E. gained by the body.) | |
| Jun 26, 2017 at 15:26 | vote | accept | Sushant Gupta | ||
| Jun 26, 2017 at 15:25 | history | edited | Hritik Narayan | CC BY-SA 3.0 |
added 123 characters in body
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| Jun 26, 2017 at 15:23 | comment | added | Sushant Gupta | So Work energy theorem is for Energy gained by the object on which work is done! Ah makes sense. Thank you SO much man. You might want to update you answer with this information. You literally clarified my misconception. Though you might want update answer so others can find it helpful, in case they too had the same doubt I had. | |
| Jun 26, 2017 at 15:21 | comment | added | Hritik Narayan | Oh! You're talking about the Energy you expend, and not the energy gained by the elephant? Then yes. You'll definitely lose more biochemical energy pushing for a longer time. | |
| Jun 26, 2017 at 15:19 | comment | added | Sushant Gupta | I did. Frictionless surface only. Still I am not finding it intuitive. With that acceleration it can take elephant to cross 100m like 10 hours, but for the pen it might be done in few minutes. Same force for either objects. But in elephants scenario, I am imparting that SAME amount force for 10 hours. So more energy is expended. right? | |
| Jun 26, 2017 at 15:17 | comment | added | Hritik Narayan | Are you imagining the Elephant to be present on Earth? With friction and all? (Think about them in vacuum where nothing really obstructs you from pushing on them) | |
| Jun 26, 2017 at 15:16 | comment | added | Sushant Gupta | Are you trying to say, I am confusing Momenta with Energy. So what is energy exactly? | |
| Jun 26, 2017 at 15:14 | comment | added | Sushant Gupta | Sorry, but I am new to Physics. Can you explain in simple words, or give some intuition. I desperately want to get this thing through my head. | |
| Jun 26, 2017 at 15:11 | history | answered | Hritik Narayan | CC BY-SA 3.0 |