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Results tagged with physics
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user 33932
25
votes
Accepted
Infeasibility of a mechanical wind-up spring KERS (Kinetic Energy Recovery System) for bicycles
Ain't gonna happen.
If you want to store energy of a 100kg cyclist+bike going at 40 km/h (plausible if you want to brake at the end of a downhill), you want to store:
0.5 * 100 * (40/3.6)^2 = 6170 J
…
- 21.2k
3
votes
Why do front gears become harder when the cassette becomes larger but opposite for the rear ...
It's easiest to think about chain speed.
A big sprocket means slow rotation of its shaft corresponds to a given chain speed.
A small sprocket on the other hand means fast rotation of its shaft corresp …
- 21.2k
2
votes
Momentum and gyroscopic difference between wheel sizes
Or is my understanding of the physics incorrect, and there really is a "angular momentum" difference between wheel sizes?
There is difference in angular momentum. …
- 21.2k