4 ms·
> The coefficient of friction is a constant which depends on the materials. This is an approximation. It holds here, but it doesn't hold for (say) figure skate
by wizzwizz4 5y ago
> The coefficient of friction is a constant which depends on the materials.
This is an approximation. It holds here, but it doesn't hold for (say) figure skates on road.
- deleted 5y ago[deleted]
- kazinator 5y agoThat is false; you might be thinking of figure skates on ice. Steel on road obeys coefficient of friction. (I promise I will keep that in mind the next time I attach skates to a bicycle frame.)
- wizzwizz4 5y agoSteel on road obeys the coefficient of friction… until it starts cutting into the road. Unless you're very light, that's going to happen if you're going an appreciable speed wearing figure skates and then try to stop.
- kazinator 5y agoYes; anything cuts into anything else if you concentrate enough weight into enough of a small area, or there are other extreme factors involved like things melting. E.g. A carbide bit milling a stainless steel object is clearly not following carbide-on-stainless coefficient of friction.