Timeline for How does the center of mass move forward on a rocking chair?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Dec 18, 2020 at 15:31 | comment | added | Peter - Reinstate Monica | @Dale Well yeah, that's not the kind of rocking commonly meant with the word, where your center of mass goes back and forth (and you can continue for a while with minimal movement relative to the chair). | |
| Dec 18, 2020 at 12:44 | comment | added | Dale | @Peter-ReinstateMonica said “So are you saying one could not start rocking if the chair were on a perfectly frictionless surface”. No. I am not saying that. I am saying that on a perfectly frictionless surface your center of gravity would not move horizontally. Instead the point of contact would slip back and forth as you rocked. Bergi and bdsl have the right idea | |
| Dec 18, 2020 at 9:39 | comment | added | Bergi | Try a rocking chair on a carpet on a smooth floor… the center of mass won't move, the carpet will. | |
| Dec 18, 2020 at 9:34 | comment | added | bdsl | It's true. The overall center of mass of the chair and sitter combinded cannot start to move horizontally unless there's some horizontal (i.e. not purely vertical) interaction with the surface or some other external object. Maybe it could start rocking but as the top of the chair moved foward the base would have to slide back to keep the COM in one spot. | |
| Dec 18, 2020 at 8:54 | comment | added | Peter - Reinstate Monica | So are you saying one could not start rocking if the chair were on a perfectly frictionless surface (as an approximation, imagine wet ice)? Interesting, but I'm not sure it's true. | |
| Dec 17, 2020 at 18:30 | vote | accept | Linkin | ||
| Dec 17, 2020 at 12:33 | history | edited | Dale | CC BY-SA 4.0 |
added 86 characters in body
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| Dec 17, 2020 at 12:27 | review | Low quality answers | |||
| Dec 17, 2020 at 12:35 | |||||
| Dec 17, 2020 at 12:08 | history | answered | Dale | CC BY-SA 4.0 |