Question

Почему коньки легко скользят по льду , а по стелку , поверхность которого более гладкая , на них кататься невозможно? Как изменится скорость скольжения , если внезапно похолодает​

Answer 1

Полозья коньков скользят потому что они давят на лёд и тот начинает плавиться- превращается в воду. В итоге образуется толкая водяная пленка между льдом и коньком. Ну а расплавить таким. Образом стекло не получится по двум причинам: температура плавления стёкла намного выше, чем те при которых катаются на коньках, и структура стёкла не такая же как у кристаллов льда, при нагревании оно становится мягче и мягче, как пластилин и него нет четкой температуры когда оно вдруг жидкое.

Ну и есть там свои хитрости, точно сказать почему лёд тает именно так, что скользко сложно.

Если похолодает, то на скольжение это особо не влияет вроде как, но если очень сильно похолодает ниже минус -60, то скольжение станет хуже.

Answer 2

Why do skates glide easily on ice but not on a smooth floor, which has a smoother surface? How will the sliding speed change if it suddenly gets colder?

When it comes to the difference in gliding ability between ice and a smooth floor, it all comes down to the properties of the surfaces and the interaction between the skate blades and the surface.

Ice: Ice has a unique property that allows skates to glide smoothly over its surface. When pressure is applied to the ice by the weight of the skater, the ice molecules beneath the skate blades melt and form a thin layer of water. This layer of water acts as a lubricant, reducing friction between the skate blades and the ice surface. The reduced friction allows the skater to glide easily on the ice [[1]].

Smooth Floor: On the other hand, a smooth floor, such as a polished wood or tile surface, does not have the same ability to form a lubricating layer of water. The surface of a smooth floor is typically dry and lacks the necessary properties to create a lubricating layer. As a result, the friction between the skate blades and the smooth floor is much higher, making it difficult to glide or skate on the surface [[2]].

Effect of Temperature Change: If the temperature suddenly drops, the effect on the sliding speed will depend on the surface being considered.

- Ice: When the temperature drops, the ice becomes colder and harder. This can increase the friction between the skate blades and the ice surface, making it slightly more difficult to glide. However, the overall effect on the sliding speed may not be significant, as the thin layer of water created by the pressure of the skater's weight can still provide some lubrication. Additionally, colder temperatures can also make the ice more solid and less prone to cracking, which can improve the overall skating experience [[3]].

- Smooth Floor: If the temperature drops, the smooth floor will not undergo any significant changes in its properties. Since the surface does not have the ability to create a lubricating layer like ice, the friction between the skate blades and the smooth floor will remain high. Therefore, the sliding speed on a smooth floor will not be affected by a sudden drop in temperature [[4]].

In summary, the ability of skates to glide easily on ice is due to the formation of a thin layer of water that acts as a lubricant, reducing friction between the skate blades and the ice surface. On a smooth floor, which lacks the ability to create a lubricating layer, the friction is higher, making it difficult to glide. A sudden drop in temperature may slightly increase the friction on ice, but it will not significantly affect the sliding speed. On a smooth floor, the sliding speed will remain unaffected by temperature changes.