a. Quantitatively explain why ice skates slide along the surface of ice. Can it get too cold

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a. Quantitatively explain why ice skates slide along the surface of ice. Can it get too cold to ice skate? 

b. Is it possible to ice skate on other materials, such as frozen carbon dioxide? 

c. What is the approximate lowest temperature at which a good snowball can be made? Why can’t a snowball be made if the temperature is too low?

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