Timeline for The physics of ill-fitting glasses frames
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
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| Jul 14, 2023 at 8:19 | comment | added | John Rennie | @Econ23 we have to be careful to distinguish the force your body parts are exerting on the frame from the force the frame is exerting on your body parts. The two are equal and opposite (in accordance with Newton's 3rd law). The arrows I've drawn are the forces your body is exerting on the frame, so your right ear is pulling the frame clockwise and your nose is pulling it anticlockwise. That means your ear is being pulled anticlockwise (i.e. forwards) and your nose is being pulled clockwise i.e. the left side of the frame pushed to the right on your nose. | |
| Jul 14, 2023 at 8:08 | comment | added | Econ23 | Thanks for this. If F nose was going in that direction, wouldn't the pain be on the right nosepad as the frame is being 'dragged' anticlockwise? I may be misintepreting because I don't think of anatomy parts 'applying' forces, rather the other way round. | |
| Jul 14, 2023 at 6:14 | history | answered | John Rennie | CC BY-SA 4.0 |