Timeline for What is the relationship between gravitation, centripetal and centrifugal force on the Earth?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 29 at 8:38 | comment | added | Paul_Pedant | @johnmorrison As the boat and the ocean are subjected to the same forces, the ocean (at least, the surface layer) will also be leaving. In fact the ocean would become oblate, and spin away in thin rings, leaving the boat stranded in the shallows (unless it was near the equator to begin with). | |
| Jun 28 at 18:00 | comment | added | john morrison | My question was more concerning the same human, in the same spot, being observed by 2 different observers: one in space (inertial reference frame) vs someone co-rotating with the human. In one case, the centrifugal force is present, and in the other, apparently, it is not. | |
| Jun 28 at 16:45 | comment | added | naturallyInconsistent | Note my first statement. As long as you are discussing centrifugal anything, I am not going to provide you with answers. You are confused with the basics. Centrifugal stuff require chopping up the "effects" part of N2L and treating some of then as if they are (fictitious) forces, which is confusing for students. Observers at different places on Earth will disagree on the apparent weight of a human because apparent gravity is different everywhere, but the mass will be in agreement. | |
| Jun 28 at 15:54 | comment | added | john morrison | A 3rd question, at the risk of asking too many: so the only forces to draw on a "free body diagram" of the system would be the gravitational force pulling in, the normal force of the ocean pushing away, and the centrifugal force? In other words, centripetal and gravitational are actually on in the same in this case? Would an external observer in space, who is not co-rotating with the planet, still say there is a centrifugal force acting on the boat? | |
| Jun 28 at 15:52 | comment | added | john morrison | Is a correct way of thinking about this that gravity provides the means for the circular motion to occur, until the point when the earth is spinning so fast that the centrifugal force overcomes gravitation and subsequently launches the boat away from the planet? | |
| Jun 28 at 15:49 | comment | added | john morrison | Part of the confusion is that the centrifugal force only exists in some reference frames and not others. So why do all observers agree on the weight of a human on the planet? Or do they not agree on that? | |
| Jun 28 at 15:37 | history | answered | naturallyInconsistent | CC BY-SA 4.0 |