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The bottom of the skis/skates is sharp. ...

The bottom of the skis/skates is sharp. Explain why.

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The sharp edges at the bottom of the skis exert enormous pressure on the snow/ice. This reduces the freezing point of water. Ice melts into water. This water acts as a lubricant. When the pressure on the skis is removed, water refreezes back This phenomenon is also called as regelation.
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SUBHASH PUBLICATION-THERMAL PROPERTIES OF MATTER-TWO MARKS QUESTION AND ANSWERS
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  2. Mention any two substances which sublime.

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  3. Define thermal conductivity. Write its SI unit.

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  4. Why is the bottom of cooking vessel made of steel, coated with copper?

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  6. Explain briefly convection air currents setting up a sea breeze.

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  7. Explain land breeze.

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  8. What are trade winds? Explain.

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  9. What are black bodies?

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  10. The bottom of the cooking vessel is usually roughened or blackened. Ex...

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  11. Solar water heaters use cadmium black as a coating material on copper ...

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  12. Distinguish between specific bent and thermal conductivity or a substa...

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  13. The bottom of the skis/skates is sharp. Explain why.

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  14. Explain the term triple point of the substance.

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  15. What is a phase diagram? Draw a phase diagram with regard to water.

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  16. Explain why, a body with large reflectivity is a poor emitter.

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  18. Explain why, an optical pyrometer calibrated for an ideal black body...

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