Page 118 - Fisika Bagian 1
P. 118
Ditanyakan:
°
a) = ⋯ ? = ⋯ ? jika = 0 (Gambar 3.8 )
°
b) = ⋯ ? = ⋯ ? jika = 60 (Gambar 3.9
Jawab:
a) =
b)
Gambar 3.8 Diagram Gaya Tarik Mendatar Gambar 3.9 Diagram Gaya Tarik
48 Membentuk Sudut
2
= = = 4 m s ⁄
12
Karena peti tidak bergerak vertikal (sumbu-y), maka resultan gaya sejajar sumbu-
y nol
∑ = 0
− = 0
2
= = = (12 kg)(10 m s ⁄ ) = 120 N
c) cos =
cos
=
1
°
(48 N)(cos 60 ) (48 N)( )
2
= = 2 = 2 m s ⁄
12 kg 12 kg
108
