Timeline for Newton's Third Law and Work Done on a Body
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 12, 2022 at 12:31 | comment | added | John Darby | Remember change in KE is from all forces. When you push a body the reaction force on you does - work but the force of ground on you does + work and unless you gain KE net work done on you is zero. | |
| Apr 12, 2022 at 12:11 | comment | added | John Darby | Here we deal with point body or rigid body for which internal energy of the body cannot change, work from a force acting through a distance can only change the kinetic energy (KE). Negative work is decrease in KE. (Potential energy just a convenient way to evaluate work from conservative force. In general, bodies have internal energy and work can change internal energy; e.g., gas expanding against a piston. This is subject of thermodynamics which broadens simple mechanics definition of work. See my answer physics.stackexchange.com/questions/703246/… | |
| Apr 12, 2022 at 8:13 | vote | accept | AltercatingCurrent | ||
| Apr 12, 2022 at 3:32 | comment | added | AltercatingCurrent | My confusion is arising believing that work done by a body = energy lost by the body and treating action and reaction as two different forces, both of which I assume are true? | |
| Apr 12, 2022 at 3:26 | comment | added | AltercatingCurrent | "Only forces on a body determine the work done on the body." I understand that, but my confusion lies in the fact that does it mean that work done on a different body doesn't mean energy loss? Like if the box applies negative work on me, it means that I'm losing energy, but does it also not mean that I'm losing energy when I'm doing positive work on the box? | |
| Apr 11, 2022 at 19:18 | vote | accept | AltercatingCurrent | ||
| Apr 11, 2022 at 19:18 | |||||
| Apr 11, 2022 at 19:06 | history | answered | John Darby | CC BY-SA 4.0 |