A wax is applied to the bottom surface of cross country skis to achieve a good balance between traction when
the skier needs to climb a small hill and speed on downhill slopes. The coefficients of both static and kinetic
friction between the waxed surface and snow increase as temperature decreases. If the temperature rises
during the day and the skier begins to slip backward on hills they should re-wax their skis with what type of
wax? (1 point)
A. One where the coefficient of kinetic friction is smaller
B. One where the coefficient of static friction is larger.
C. One where the coefficient of kinetic friction is larger
D. One where the coefficient of static friction is smaller

The friction force is a macroscopic force that opposes the relative movement of bodies, it is the sum of many interactions at the microscope level.

In general for solid bodies the expression of the out of friction is

[tex]fr = \mu N[/tex]

Where fr is the friction force, μ the friction coefficient and N the normal.

The friction coefficient can be of two types:

Static for when the relative velocity between the two bodies is zero.

Dynamic when the relative velocity between the two bodies is different from zero.

In general, the dynamic coefficient is less than the static one.

In this case, as the temperature increases, the friction coefficient decreases, so the skier begins to slide downwards. To prevent this sliding, he must use a wax with a higher friction coefficient.

If you only want to stand on the hill, a wax with a static coefficient must be used, while standing if you want to advance on the hill you must use a wax with a dynamic coefficient since there is a relative movement between the skier and the hill.

Let's examine the different alternatives:

A. False. The friction coefficient must be higher, so that there is more friction force.

B. True. The friction increases and can be stopped on the hill and move up the hill.

C. False In this case, you can go up the hill, but if you stop, you can go back.

D. False. The coefficient must be higher, to increase friction.

Consequently we see that the only type of wax that will allow you to stand or advance on the hill is

B. A wax with a higher statutory coefficient.

In conclusion, using the defined friction force we can find the correct result for what type of wax to use is:

B. One where the coefficient of static friction is larger.

Learn more here: brainly.com/question/4230804