20 points plz help i dont really understand how to do this my grades at d rn plz help lol tysm if you do < 3

20 points plz help i dont really understand how to do this

my grades at d rn plz help lol tysm if

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Ответ:

rogersdeloris1ovgm3b

14.05.2020

Physics

$c_{s}=0.45$ , $c_{k}=0.26$

Explanation:

Let the coefficient of static friction be $c_{s}$

Let the coefficient of kinetic friction be $c_{k}$

Let the normal reaction force be

N=mg where is the mass of crate and is the universal gravitational constant.

Given,

$m=18Kg\\g=9.8ms^{-2}$

$N=18\times 9.8=176.4N$

It is given that 80N is required to overcome static friction,

So, $80=c_{s}\times 176.4$

$c_{s}=0.45$

It is given that 46N is required to overcome kinetic friction,

So, $46=c_{k}\times 176.4$

$c_{k}=0.26$

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