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Revision as of 12:16, 17 January 2021
Welcome to the explain xkcd wiki!
We have an explanation for all 3184 xkcd comics, and only 52 (2%) are incomplete. Help us finish them!
Latest comic
| Inverted Catenaries |
 Title text: Some tires are marketed as 'all-shape tires,' but if driven in a climate with both inverted catenary falls and triangle falls, they wear out really fast. |
Explanation
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This is one of 52 incomplete explanations: This page was created BY A TRAPEZOIDAL WHEEL. Don't remove this notice too soon. If you can fix this issue, edit the page! |
During the winter, in snowy areas, people need to replace their typical, all-season tires with snow tires made specifically for the slick environment. In this comic, instead of snow, rounded shapes called inverted catenary curves fall from the skies. On a plane covered in inverted catenaries all the same size, square wheels whose side length matches the arc length of the catenary are capable of rolling smoothly, contrary to how they would act on a normal road. Regular wheels would cause a significantly bumpier ride on this terrain, so Cueball plans to swap them out with square wheels to better suit the season.
Mathematicians have found what types of roads would suit weird wheels the most, and inverted catenary curves are best suited for a square wheel. People have made real tracks demonstrating this.
Note however, this assumes the catenaries are arranged periodically with no spacing between them, fully cover the surface, and are consistent in shape and orientation. The orientation also would restrict the direction of travel, effectively meaning your vehicle would be travelling on rails.
The title text mentions all-shape tires (as a play on all-terrain tire), which is advertised to supposedly fit any shape road. However, different shapes would require very different wheels; for example, falling triangles would form a sawtooth road, for which one would optimally require wheels pasted together from pieces of an equiangular spiral. Any hypothetical all-shape wheel would wear out very quickly on most surfaces.
Transcript
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This is one of 27 incomplete transcripts: Don't remove this notice too soon. If you can fix this issue, edit the page! |
- [Megan and Cueball are walking together as inverted catenary curves fall from the sky. A few have landed in a regular formation, all flat-side down and evenly spaced, with some touching each other.]
- Cueball: Oh wow, the first inverted catenary fall of the year!
- Cueball: Time to swap out my all-season tires for square ones.
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