Timeline for Why does the bending of light not depend on the wavelenght or energy of the photon?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 27, 2022 at 16:21 | comment | added | Peter Bernhard | Hi HF ("four"), please give notice to be removed to chat. I'm still working on your answer. Basically, I have a hard time accepting that all planets fall onto the sun in "one speed" as I have F=ma heavy on my mind. Conversely, Blue shift shouldn't be easy to accept as a fact as it seems to discriminate according to wavelenght. Same velocity of all objets and stars, that recalls speed of light not discriminating wavelength. I must think it all over. Thank you "!" - Perpendicularity seems the only curve that does not change the force by moving. | |
| Nov 27, 2022 at 13:43 | comment | added | Peter Bernhard | Ref. to "The component of motion perpendicular to the center of force remains constant (in airless space)" in my understanding refers to "radial acceleration" (carroussel). Again, inertial (3 basic Newton laws) mass different from gravitational (Newton's law on gravitation)? To me it comes to a a surprise to find that you are correct: different from attraction in a straight line which makes the gravitational force constantly change, with change of distance, this seems not to be true with circular motion (the attracting force (radial force) is gravitation) as distance is not changed, is it? | |
| Nov 27, 2022 at 13:32 | comment | added | Peter Bernhard | I didn't say so, why? To the contrary, your daringly saying gravitation is "no force" cannot be over-estimated. Gravity and gravitational mass are different from inertial mass; that's why they had to be "found" equivalent. If a "real" force" that obeys F=1/2ma exerts force on a specific mass/object that object just does not determine, by its mass, how much force is exerted. Different! 1/2ma can not easily be used to "cancel" out m in Gm1m2/r2. - A couple of wavelenghts are a couple of different things, like small and big planets. Feather and hammer, what about Mercury and Mars flying. | |
| Nov 26, 2022 at 10:46 | comment | added | Peter Bernhard | Ref. to "Gravity exerts an attraction ..., but is not a force. On the falling body no acceleration acts (we are always weightless at the free fall ...," I guess this describes the problem I have and had with accepting the equivalence of inertial and gravitational mass. "One mass" exerting impulse to some other mass does so NOT according to the mass it pushes. Feather and lead are not equal. Only the earth does not discriminate. That's how I explain that you say gravitation is not a force. Textbooks that say there is no acceleration in falling (or the opposite) should elaborete even more. | |
| Nov 26, 2022 at 5:56 | history | answered | HolgerFiedler | CC BY-SA 4.0 |