Timeline for How is energy conserved when a man climbs a stair?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 3, 2018 at 14:03 | comment | added | knzhou | This is incorrect. You're confusing the notion of work with that of center of mass work, e.g. see here. | |
| Dec 3, 2018 at 10:17 | comment | added | Prakhar Bhalla | @Emilio Pisanty when you place an object on the elevator and lift it through the height then it is the normal force only on the object that perform work of normal force * height raised. so work done by normal is not always zero it depends on the direction of displacement. if displacement is at right angle to the normal force then only work done by normal is zero since work is a dot or scalar product of force and displacement. | |
| Dec 3, 2018 at 10:00 | review | Late answers | |||
| Dec 3, 2018 at 10:59 | |||||
| Dec 3, 2018 at 9:54 | comment | added | Emilio Pisanty | The normal force acts through a zero displacement. It therefore performs zero work. | |
| Dec 3, 2018 at 9:45 | review | First posts | |||
| Dec 3, 2018 at 17:10 | |||||
| Dec 3, 2018 at 9:42 | history | answered | Prakhar Bhalla | CC BY-SA 4.0 |