My professor gives us these \"no-question\" problems, where we have to find all

Question

My professor gives us these "no-question" problems, where we have to find all of the forces, velocities, accelerations, etc... so I will copy the image of the problem here to make it easier to understand.

The device allows novices to ski downhill at reduced speeds. The block has a mass of 15 kg and the skier has a mass of 70 kg. THe coefficient of friction is (0.05, 0.04). The skier starts from rest at the top of a 30 m, 20 degree slope.

I am having issues incorporating the coefficent of friction into the problem....do I take each component to get a total value for the coefficient of friciton?

The device at right allows novices to ski downhill at reduced speeds. The block has a mass of 15 kg and the skier has a mass of 70 kg. The coefficient of friction is (0.05,0.04). The skier Starts from rest at the top of a 30 m, 200 slope.

Explanation / Answer

use coefficient of kinetic friction = 0.04

in (0.05 , 0.04) one is static friction coefficient & one is kinetic friction coefficient. (these are not x or y component because coefficients are not vectors)

as we know that ;

static friction coefficient > kinetic friction coefficient

so here,

static friction coefficient = 0.05

& kinetic friction coefficient = 0.04

you just use 0.04

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