A ski that is placed on snow will stick to the snow. However, when the ski is mo

Question

A ski that is placed on snow will stick to the snow. However, when the ski is moved along the snow, the rubbing warms and partially melts the snow, reducing the coefficient of friction and promoting sliding. Waxing the ski makes it water repellent and reduces friction with the resulting layer of water. A magazine reports that a new type of plastic ski is especially water repellent and that, on a gentle 160 m slope in the Alps, a skier reduced his top-to-bottom time from 67 s with standard skis to 45 s with the new skis.
(a) Determine the magnitude of his average acceleration with each pair of skis.
old skis
m/s2
new skis
m/s2

(b) Assuming a 3.0° slope, compute the coefficient of kinetic friction for each case.
old skis

new skis

Explanation / Answer

use a formula... D =200m Vo =0m/s V =X A =? T = 61.6s you see you don't have to find friction.. --_-- use this formula and substitute the values of the variable A) D = (Vo)(T) + ((A)(T)^2) / 2 ) B) Do the same as A. Make the table of values then substitute. C) should be common sense D) do a summation equation to find the force of friction on the object. only then will you get the coefficient(mu

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