4 ms·
> We want to find the force at each tire. So by rearranging, we get F = PA. The pressure is gotten by a tire pressure gauge. Can someone explain why the air pr
by rlpb 6y ago
> We want to find the force at each tire. So by rearranging, we get F = PA. The pressure is gotten by a tire pressure gauge.
Can someone explain why the air pressure inside the tire is the same as the pressure that the tire applies to the ground? Ignoring sidewall stiffness as pointed out to others, why must this be true?
- yk 6y agoBecause the tire would deform, if there is a net force on it. Therefore the force from the inside is the same as the one on the outside. (However, that argument has only any chance to hold at the contact point from the tire to the ground, since obviously everywhere else the tire does not perform because of stiffness of the tire material.)
- lmm 6y agoThe force must be the same (because the net force must be zero, otherwise the tire surface would move up or down), and the area is the same on both sides so the pressure must be the same.
- wko27 6y agoIt actually isn't true at all in practice. The inflation pressure and contact pressures vary dramatically even for a static tire due to curvature, tread depth, and many other factors. See e.g. https://www.sensorprod.com/news/white-papers/tcp/wp_tcp.pdf https://www.sensorprod.com/news/white-papers/tcp/wp_tcp.pdf