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1.) diketahui =
m1 = 2kg
m2 = 3kg
r = 10cm
Mk = 6kg
ditanya =
A. a = ?
B. T1 & T2 = ?

jawab :
A.
a = (m1 - m2) g / k Mk + m1 + m2
a = (3 - 2) 10 / (1/2 . 6) + 2 + 3
a = (-1) 10 / 3 + 2 + 3
a = 10/8 = 1,25 ms-²

B.
T1 = M1g + M1a = 2(10) + 2(1,25)
= 20 + 2,5
= 22,5 N

T2 = M2g + M2a = 3(10) - 3 (1,25)
= 30 - 3,75
= 26,25


2.) Diketahui =
m = 10kg =0,1 m
r = 10cm
g = 10 m/s
Ditanya :
a = L ?
b = a ?
c = alpha?
d = fg ?
e = T ?

jawaban ada digambar atas ^

3.) diketahui =
I1 = 8kg m²
I2 = 2 kgm²
W1 = 3 putaran /a
ditanya = W2 ?

jawab =
I2 W2 = I1 W1
W2 = I1 W1/I2
W2 = 8 . 3 / 2
W2 = 4 . 3 / 1
W2 = 12 / 1
W2 = 12 putaran / s


4.) Diketahui =
m = 10 kg
f = 50N
r = 40cm
Ditanya = a ?

Σ τ = Ia
(F - Fges) r= 1/2 Mr² . a/r
(F - Fges) = 1/2 M . a (pada tahap ini hilangkan r nya)
(F - Fges) = 1/2 Ma
50 - Fges = 1/2 . 10 . a
50 - Fges = 5a.....(pers 1)

Σ F = m . a
F + Fges = ma
50 + Fges = 10a ....... (pers 2)

=> 50 - Fges = 5a
=> 50 - Fges = 10a
_________________ -
100 = 15a
a = 15 / 100 = 6,67 m/s²

atau bisa juga pakai cara

a = 2F/m (l + k)
= 2 (50) / 10 (1 + 1/2)
= 100 / 10 (1 + 1/2)
= 10 / 3/2
= 20 / 3
= 6,67 m/s²


5.) Diketahui =
Bola pejal
m = 10 kg
R = 1 m
h = 28 m

Ditanya = V?

V = √ 10 gh/ 7
V = √ 10/7 gh
V = √ (10 . 10) . 28 / 7
V = √ 100 . 28/7
V = √ 100 . 4 /1
V = √ 400
V = 20 m/s²
_____________

2 / L.K

2 / 1 + 2/5
= 10/7

2/1+1/2 = 2/11/2 = 2/3 = 4/3


6.) Diketahui
m = 0,25 kg
r = 5cm = 0,05cm
V = 4m/ s

Ditanya =Ek?

Ek = Ek trans + Ek rot
= 1/2 mv² + 1/2 I W²
= 1/2 mv² + 1/2 (1/2 mr²)
= 1/2 mv² + 1/4 mv² = 3/4 mv²
= 3/4 (0,25) (4)² = 3/4 . 1/4 . 16 = 3 joule

Ek = 1/2 mv² (1 + k)
= 1/2 . 0,25 . 16 (1+1/2)
= 2 (3/2) = 3τ

7.) Diketahui =
m = 0,2 kg
W= 10 rad/s
r = 30cm = 0,3 ?

Ditanya = sudut L...?

L= momentum sudut
V = Wr = 10 (0,3) = 3m/s²
L = mvr = 0,2 (3) (0.3)
L = 0,18 kgm²s-¹

8.)Diketahui =
Wb = 20N
Wb = 10N
1Ab = 4cm = 4m
a = 37°
1Ao = 1/2 Ab 1Ab (0,4) = 0,2

Ditanya = Tegangan tali T ?
Jawab = Σ τ = 0
τ1 + τ2 + τ3 = 0
T sin 37° . lab + Wb . lao + Wb . Lab = 0
T (0,6) (0,4) + 10 (0,2) + 20 (0,4) = 0
-0,24T +2 +8 = 0
T = -10/-0,24 = 41,7 N