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a = v/t
a = 20/10
a = 2 m/s²
ΣFy = 0
Na-2mg = 0
Na-2m(10) = 0
Na - 20m = 0
Na = 20m
**************************
Nb-mg = 0
Nb-m(10) = 0
Nb-10m = 0
Nb = 10m
***************************
Fgesek a= N₁.μk
= 20m.(0,5)
= 10m
Fgesek b= N₂.μk
= 10m (0,5)
= 5m
*******************************
ΣFxa = ma
Fa-Fgesek a = 2ma
Fa-10m = 2m(2) -----------------> Coret m nya , dan menjadi :
Fa - 10 = 4
Fa = 10+4
Fa = 14 N
~~~~~~~~~~~~~~~~~~~
ΣFxb = ma
Fb-Fgesek b = ma
Fb-5m = m(2) -----------------> Coret m nya , dan menjadi :
Fb-5 = 2
Fb = 7 N
~~~~~~~~~~~~~~~~~~~
Nilai F = ΣF
ΣF = (F₁+F₂)
= (14+7)
ΣF = 21 N
Atau dengan cara Mencari Resultan
R = √Fa² + Fb² + 2FaFb Cos Ф
R = √14² + 7² + 2(14)(7) Cos 0
R = √196 + 49 + 196 (1)
R = √441
R = 21 N
Nilai F adalah 21 Newton.
B).
ΣFxb = ma
Fb-Fgesek₂ = ma
Fb-5m = m(2) -----------------> Coret m nya , dan menjadi :
Fb-5 = 2
Fb = 7 N