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2 December, 10:48

Emma is working in a shoe test lab measuring the coefficient of friction for tennis shoes on a variety of surfaces. The shoes are pushed against the surface with a force of 400 N, and a sample of the surface material is then pulled out from under the shoe by a machine. The machine pulls with a force of 300 N before the material begins to slide. When the material is sliding, the machine has to pull with a force of only 200 N to keep the material moving.

a. What is the coefficient of static friction between the shoe and the material?

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  1. 2 December, 11:04
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    normal force in the vertical direction = 400 N

    static friction = 300

    uS*N = 300

    uS * 400 = 300

    us = 0.75

    dynamic friction or kinetic friction = 200

    uK * 400 = 200

    uk = 0.5

    a) 0.75 b) 0.5
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