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 A rigid body is said to be in statical equlibrium when the resultant force acting on the body is zero and the resultant torsion at any point of the rigid.

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Presentasi berjudul: " A rigid body is said to be in statical equlibrium when the resultant force acting on the body is zero and the resultant torsion at any point of the rigid."— Transcript presentasi:

1  A rigid body is said to be in statical equlibrium when the resultant force acting on the body is zero and the resultant torsion at any point of the rigid body is zero  Mathematically is  Σ F = 0 and Σ τ = 0  If Σ F = 0 the body is in translational equilibrium  If Σ τ = 0 the body is in rotational equlibrium

2  1. Stable Equilibrium.  Stable Equilibrium is characterized by the raise in object’s center of gravity whenever it is given a stimulus  When disturbance has gone, the object will return

3  2. Unstable Equilibrium  Unstable Equilibrium is characterized by the lowering in object’s center of gravity whenever it is given a stimulus  When disturbance has gone, the object does not return to initial position

4  3. Indifferent ( Netral ) Equilibrium  Indifferent Equilibrium is characterized by the in object’s center of gravity will not undergo any change in height whenever it is given a stimulus

5 w T f N α T sin α T cosα F Stable conditional: 1. Σ F = 0 ⇒ Σ F x = 0 Σ F y = 0 Σ F x = 0 N = T cosα Σ F y = 0 w = f + T sin α 2. Σ τ = 0 ½ L.w - L T sin α = 0

6 Hitunglah tegangan tali dan gaya pada ujung engsel. Berat batang = 20N,berat papan=30N SMA 1 KLATEN 37 o

7 45o 45o 0,375 L θ 0,625 L

8 licin kasar A B NANA NBNB fsfs θ Syarat kesetimbangan: 1.Σ F = 0 Σ F x = 0 N A = f s Σ F y = 0 N B =W 2. Σ τ = 0 dari titik B L sin θ. N A - 1/2 Lcosθ.W=0 w F

9 kasar A B NANA NBNB f sB θ Syarat kesetimbangan: 1.Σ F = 0 Σ F x = 0 N A = f sB Σ F y = 0 N B +fs A =w 2. Σ τ = 0 dari titik B L sin θ. N A - 1/2Lcosθ.W +Lcosθ. f sA =0 w FBFB FAFA f sA

10 0,4 M 2M F

11 Sebuah truk massa 3 ton melintasi sebuah jembatan yang panjangnya 50 m, jika truk jaraknya dari ujung awal 20 m. Berapakah gaya yang bekerja pada ujung-ujung jembatan,jika berat jembatan N.

12  Sebuah tangga massanya 40 kg yang disandarkan pada dinding yang licin dan terletak pada lantai yang kasar dengan koefisien gesekan 0,5.Seorang yang massanya 60 kg menaiki tangga. Berapakah tinggi orang itu menaiki tangga sampai saat tepat akan tergelincir tangganya. 10 m 6 m 8 m


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