Корнеева Т.П. Сборник задач по физике. Механика 1. Задача 2.19
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Нормальная сила равна :
F
n
=
m
g
cos
α
{\displaystyle F_{n}=mg\cos \alpha }
Сила трения равна :
F
=
k
m
g
cos
α
{\displaystyle F=kmg\cos \alpha }
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